<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:241f5f92-e2ec-4eee-9642-67fdb1086500,g:89ad9162-6b5a-4f9d-b0c7-c7c17f65f8d2-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://wabtec.com/role/CONSOLIDATEDSTATEMENTSOFINCOME" xlink:type="simple" xlink:href="wab-20241231.xsd#CONSOLIDATEDSTATEMENTSOFINCOME"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/CONSOLIDATEDSTATEMENTSOFINCOME" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_dbf8c983-f814-4326-a47d-442cbcaa5413" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_d136ffba-b4a4-4446-9ada-37c6390bb575" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_dbf8c983-f814-4326-a47d-442cbcaa5413" xlink:to="loc_us-gaap_StatementTable_d136ffba-b4a4-4446-9ada-37c6390bb575" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_7ced03b0-55c9-4119-9932-b5b7dfef790c" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_d136ffba-b4a4-4446-9ada-37c6390bb575" xlink:to="loc_srt_ProductOrServiceAxis_7ced03b0-55c9-4119-9932-b5b7dfef790c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_7ced03b0-55c9-4119-9932-b5b7dfef790c_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_7ced03b0-55c9-4119-9932-b5b7dfef790c" xlink:to="loc_srt_ProductsAndServicesDomain_7ced03b0-55c9-4119-9932-b5b7dfef790c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_48ad7bb2-6833-4ca5-8ed9-b73d0ca5e2ed" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_7ced03b0-55c9-4119-9932-b5b7dfef790c" xlink:to="loc_srt_ProductsAndServicesDomain_48ad7bb2-6833-4ca5-8ed9-b73d0ca5e2ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_59da0763-26de-436c-91c7-edceb243d5d9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_48ad7bb2-6833-4ca5-8ed9-b73d0ca5e2ed" xlink:to="loc_us-gaap_ProductMember_59da0763-26de-436c-91c7-edceb243d5d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceMember_f2e6ff1f-e5ed-4aca-8d8b-d1bef3780ca7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_48ad7bb2-6833-4ca5-8ed9-b73d0ca5e2ed" xlink:to="loc_us-gaap_ServiceMember_f2e6ff1f-e5ed-4aca-8d8b-d1bef3780ca7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_862d63eb-2a8a-436e-80ab-9c7afbd3de33" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dbf8c983-f814-4326-a47d-442cbcaa5413" xlink:to="loc_us-gaap_RevenuesAbstract_862d63eb-2a8a-436e-80ab-9c7afbd3de33" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_c837acc2-b39c-4fe2-83c5-3552bd68844a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_862d63eb-2a8a-436e-80ab-9c7afbd3de33" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_c837acc2-b39c-4fe2-83c5-3552bd68844a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenueAbstract_95ba0402-6132-431d-8b53-33265dcff913" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfRevenueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dbf8c983-f814-4326-a47d-442cbcaa5413" xlink:to="loc_us-gaap_CostOfRevenueAbstract_95ba0402-6132-431d-8b53-33265dcff913" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_ed97eaf2-8720-4368-9c92-d97d28348dfc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_95ba0402-6132-431d-8b53-33265dcff913" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_ed97eaf2-8720-4368-9c92-d97d28348dfc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_54e2f265-4655-4ae6-897a-01d839e16c87" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dbf8c983-f814-4326-a47d-442cbcaa5413" xlink:to="loc_us-gaap_GrossProfit_54e2f265-4655-4ae6-897a-01d839e16c87" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_26ecd93e-5ec6-4ca7-a265-cbe250322278" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dbf8c983-f814-4326-a47d-442cbcaa5413" xlink:to="loc_us-gaap_OperatingExpensesAbstract_26ecd93e-5ec6-4ca7-a265-cbe250322278" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_0f43c5d9-a42f-4657-b56d-6755800f19ae" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_26ecd93e-5ec6-4ca7-a265-cbe250322278" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_0f43c5d9-a42f-4657-b56d-6755800f19ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_8863306d-5503-4678-8283-3c22a6e8ab7d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_26ecd93e-5ec6-4ca7-a265-cbe250322278" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_8863306d-5503-4678-8283-3c22a6e8ab7d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_6f65156b-04da-42fa-870b-668474544686" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_26ecd93e-5ec6-4ca7-a265-cbe250322278" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_6f65156b-04da-42fa-870b-668474544686" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_9a4fe1e4-caf1-482d-8e23-ef9d5810658c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_26ecd93e-5ec6-4ca7-a265-cbe250322278" xlink:to="loc_us-gaap_OperatingExpenses_9a4fe1e4-caf1-482d-8e23-ef9d5810658c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_545bb232-eca3-46e1-b5c4-1eefa419c1d8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dbf8c983-f814-4326-a47d-442cbcaa5413" xlink:to="loc_us-gaap_OperatingIncomeLoss_545bb232-eca3-46e1-b5c4-1eefa419c1d8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_fe8640e5-edd3-429b-8183-2e10c46c3bd4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NonoperatingIncomeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dbf8c983-f814-4326-a47d-442cbcaa5413" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_fe8640e5-edd3-429b-8183-2e10c46c3bd4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_f2065e50-5ac3-4d38-99f1-d45154b9fcea" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_fe8640e5-edd3-429b-8183-2e10c46c3bd4" xlink:to="loc_us-gaap_InterestExpenseNonoperating_f2065e50-5ac3-4d38-99f1-d45154b9fcea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_d1da359e-55a8-401e-95e1-964a52bf0278" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_fe8640e5-edd3-429b-8183-2e10c46c3bd4" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_d1da359e-55a8-401e-95e1-964a52bf0278" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_df179bdf-397f-4822-9ab0-7c4ca4239873" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dbf8c983-f814-4326-a47d-442cbcaa5413" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_df179bdf-397f-4822-9ab0-7c4ca4239873" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_246bb842-0ffd-47b4-8133-fa24c937b634" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dbf8c983-f814-4326-a47d-442cbcaa5413" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_246bb842-0ffd-47b4-8133-fa24c937b634" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_47b5a9e5-e166-4dbc-b121-582801be7ef6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dbf8c983-f814-4326-a47d-442cbcaa5413" xlink:to="loc_us-gaap_ProfitLoss_47b5a9e5-e166-4dbc-b121-582801be7ef6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_b5b9828f-9c71-4e9c-b261-00337b792528" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dbf8c983-f814-4326-a47d-442cbcaa5413" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_b5b9828f-9c71-4e9c-b261-00337b792528" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_627e25d9-5776-498f-9f35-8b98ae4f4b02" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dbf8c983-f814-4326-a47d-442cbcaa5413" xlink:to="loc_us-gaap_NetIncomeLoss_627e25d9-5776-498f-9f35-8b98ae4f4b02" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_fbd794b3-92c9-497d-9034-c47089927e51" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dbf8c983-f814-4326-a47d-442cbcaa5413" xlink:to="loc_us-gaap_EarningsPerShareAbstract_fbd794b3-92c9-497d-9034-c47089927e51" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_cbce889c-dd35-4439-8776-fdc844e1058d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_fbd794b3-92c9-497d-9034-c47089927e51" xlink:to="loc_us-gaap_EarningsPerShareBasicAbstract_cbce889c-dd35-4439-8776-fdc844e1058d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_97e061d5-5add-4879-801d-0accbe2eebf1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_cbce889c-dd35-4439-8776-fdc844e1058d" xlink:to="loc_us-gaap_EarningsPerShareBasic_97e061d5-5add-4879-801d-0accbe2eebf1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract_e7f31f75-f8bd-4005-a234-baa640105eb1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareDilutedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_fbd794b3-92c9-497d-9034-c47089927e51" xlink:to="loc_us-gaap_EarningsPerShareDilutedAbstract_e7f31f75-f8bd-4005-a234-baa640105eb1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_9eac7e8c-e665-4bb9-aaa1-ddf4e0d9aea9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_e7f31f75-f8bd-4005-a234-baa640105eb1" xlink:to="loc_us-gaap_EarningsPerShareDiluted_9eac7e8c-e665-4bb9-aaa1-ddf4e0d9aea9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_cd613132-d649-4272-91ff-c507d24b259d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dbf8c983-f814-4326-a47d-442cbcaa5413" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_cd613132-d649-4272-91ff-c507d24b259d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_174aa3bd-5e58-4c82-8410-4546574991c4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_cd613132-d649-4272-91ff-c507d24b259d" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_174aa3bd-5e58-4c82-8410-4546574991c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_64c318ad-7511-4290-abed-257c6050254b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_cd613132-d649-4272-91ff-c507d24b259d" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_64c318ad-7511-4290-abed-257c6050254b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITY" xlink:type="simple" xlink:href="wab-20241231.xsd#CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_d56c9949-0e0b-46d9-b61f-a721dcd156b9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_3e15b232-c166-4bec-af2d-ed40cfd10802" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_d56c9949-0e0b-46d9-b61f-a721dcd156b9" xlink:to="loc_us-gaap_StatementTable_3e15b232-c166-4bec-af2d-ed40cfd10802" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_633f3537-63e4-4a80-88f7-dd40e88bef19" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_3e15b232-c166-4bec-af2d-ed40cfd10802" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_633f3537-63e4-4a80-88f7-dd40e88bef19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_633f3537-63e4-4a80-88f7-dd40e88bef19_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_633f3537-63e4-4a80-88f7-dd40e88bef19" xlink:to="loc_us-gaap_EquityComponentDomain_633f3537-63e4-4a80-88f7-dd40e88bef19_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_12991a32-74da-4399-9d97-1ea253217878" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_633f3537-63e4-4a80-88f7-dd40e88bef19" xlink:to="loc_us-gaap_EquityComponentDomain_12991a32-74da-4399-9d97-1ea253217878" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_ab5576fc-3708-40bc-b66e-1116a429ef16" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_12991a32-74da-4399-9d97-1ea253217878" xlink:to="loc_us-gaap_CommonStockMember_ab5576fc-3708-40bc-b66e-1116a429ef16" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_c27053f0-0e05-48d0-a74f-d389f1f5ea27" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_12991a32-74da-4399-9d97-1ea253217878" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_c27053f0-0e05-48d0-a74f-d389f1f5ea27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_cc5b6458-c499-42de-9840-fffa9b211cb5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_12991a32-74da-4399-9d97-1ea253217878" xlink:to="loc_us-gaap_TreasuryStockCommonMember_cc5b6458-c499-42de-9840-fffa9b211cb5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_d72535b6-db23-4362-a4dc-db53c730a4b1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_12991a32-74da-4399-9d97-1ea253217878" xlink:to="loc_us-gaap_RetainedEarningsMember_d72535b6-db23-4362-a4dc-db53c730a4b1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_7f5d7cbe-c8c1-408e-a6b5-43014c18d45d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_12991a32-74da-4399-9d97-1ea253217878" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_7f5d7cbe-c8c1-408e-a6b5-43014c18d45d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_daa0836a-2ae3-49f4-81e3-50efb2a172e4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_12991a32-74da-4399-9d97-1ea253217878" xlink:to="loc_us-gaap_NoncontrollingInterestMember_daa0836a-2ae3-49f4-81e3-50efb2a172e4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_46c4fb72-36d3-4811-bff1-46ceba5193ad" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_d56c9949-0e0b-46d9-b61f-a721dcd156b9" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_46c4fb72-36d3-4811-bff1-46ceba5193ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_78fb7f42-122d-48f6-a2c5-7577d2ce8837" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_46c4fb72-36d3-4811-bff1-46ceba5193ad" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_78fb7f42-122d-48f6-a2c5-7577d2ce8837" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_64537ecb-0192-44ed-b16d-89cff2ee3218" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_46c4fb72-36d3-4811-bff1-46ceba5193ad" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_64537ecb-0192-44ed-b16d-89cff2ee3218" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_62da0195-d236-4606-a612-07e2464473df" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_46c4fb72-36d3-4811-bff1-46ceba5193ad" xlink:to="loc_us-gaap_TreasuryStockCommonShares_62da0195-d236-4606-a612-07e2464473df" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCash_40b0518b-c6a0-4508-aad2-c0cd161af4f2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DividendsCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_46c4fb72-36d3-4811-bff1-46ceba5193ad" xlink:to="loc_us-gaap_DividendsCash_40b0518b-c6a0-4508-aad2-c0cd161af4f2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_a52f7a5f-5a3a-494d-b767-84a86c348737" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_46c4fb72-36d3-4811-bff1-46ceba5193ad" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_a52f7a5f-5a3a-494d-b767-84a86c348737" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_StockGrantedExercisedAndCancelledForVariousEquityInstruments_b72d421a-2d4b-40b0-8b2d-97d2d84f796a" xlink:href="wab-20241231.xsd#wab_StockGrantedExercisedAndCancelledForVariousEquityInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_46c4fb72-36d3-4811-bff1-46ceba5193ad" xlink:to="loc_wab_StockGrantedExercisedAndCancelledForVariousEquityInstruments_b72d421a-2d4b-40b0-8b2d-97d2d84f796a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_d8e2a03c-3c2c-47b1-b6e7-07210e0edd08" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_46c4fb72-36d3-4811-bff1-46ceba5193ad" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_d8e2a03c-3c2c-47b1-b6e7-07210e0edd08" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_7f1df0d0-9ad9-4e89-80f6-8763638a48bd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_46c4fb72-36d3-4811-bff1-46ceba5193ad" xlink:to="loc_us-gaap_ProfitLoss_7f1df0d0-9ad9-4e89-80f6-8763638a48bd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_a2e539c9-d0ac-4804-8943-a63623502560" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_46c4fb72-36d3-4811-bff1-46ceba5193ad" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_a2e539c9-d0ac-4804-8943-a63623502560" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_80548a8a-ddfd-42d8-979f-5f2c71a6483e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_46c4fb72-36d3-4811-bff1-46ceba5193ad" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_80548a8a-ddfd-42d8-979f-5f2c71a6483e" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_1cbf7e08-9042-4c50-8cbe-fe5632d29891" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_46c4fb72-36d3-4811-bff1-46ceba5193ad" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_1cbf7e08-9042-4c50-8cbe-fe5632d29891" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_c376696e-0586-495a-bef8-b3b04e7ffac7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_46c4fb72-36d3-4811-bff1-46ceba5193ad" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_c376696e-0586-495a-bef8-b3b04e7ffac7" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityOther_44162c81-daaa-4b28-9381-f34e98593b5c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquityOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_46c4fb72-36d3-4811-bff1-46ceba5193ad" xlink:to="loc_us-gaap_StockholdersEquityOther_44162c81-daaa-4b28-9381-f34e98593b5c" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_947021b8-16b5-4083-96fd-09149ee952b3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_950f6ecd-0e16-425a-a6dd-5d29f85fafe6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_f2febc06-a6a8-45ae-8290-c8d734cd905d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TreasuryStockCommonShares"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/BUSINESSDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#BUSINESSDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/BUSINESSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductInformationLineItems_81655688-6590-4c81-a4f2-73418d5a86a1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProductInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfProductInformationTable_e17ca4e6-f472-4c80-a72b-821d0c323cdd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfProductInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ProductInformationLineItems_81655688-6590-4c81-a4f2-73418d5a86a1" xlink:to="loc_us-gaap_ScheduleOfProductInformationTable_e17ca4e6-f472-4c80-a72b-821d0c323cdd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_06e454e0-e230-4737-8e7d-e0c51b8c763f" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfProductInformationTable_e17ca4e6-f472-4c80-a72b-821d0c323cdd" xlink:to="loc_srt_StatementGeographicalAxis_06e454e0-e230-4737-8e7d-e0c51b8c763f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_06e454e0-e230-4737-8e7d-e0c51b8c763f_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_06e454e0-e230-4737-8e7d-e0c51b8c763f" xlink:to="loc_srt_SegmentGeographicalDomain_06e454e0-e230-4737-8e7d-e0c51b8c763f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_612df45b-69f3-462c-afbf-c6dcabf5e603" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_06e454e0-e230-4737-8e7d-e0c51b8c763f" xlink:to="loc_srt_SegmentGeographicalDomain_612df45b-69f3-462c-afbf-c6dcabf5e603" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_9d5e8279-d64b-47eb-8752-b9976f7f8306" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_612df45b-69f3-462c-afbf-c6dcabf5e603" xlink:to="loc_us-gaap_NonUsMember_9d5e8279-d64b-47eb-8752-b9976f7f8306" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_4e870182-a0b5-4b21-88be-bf5318bc934e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfProductInformationTable_e17ca4e6-f472-4c80-a72b-821d0c323cdd" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_4e870182-a0b5-4b21-88be-bf5318bc934e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_4e870182-a0b5-4b21-88be-bf5318bc934e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_4e870182-a0b5-4b21-88be-bf5318bc934e" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_4e870182-a0b5-4b21-88be-bf5318bc934e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_83babfc1-6f71-4619-8427-591dd9292974" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_4e870182-a0b5-4b21-88be-bf5318bc934e" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_83babfc1-6f71-4619-8427-591dd9292974" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerMember_d2807a38-ffb2-4b25-be49-f5983a1e6985" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_83babfc1-6f71-4619-8427-591dd9292974" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerMember_d2807a38-ffb2-4b25-be49-f5983a1e6985" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_e1c90009-37e7-45aa-81f5-d6553037c189" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfProductInformationTable_e17ca4e6-f472-4c80-a72b-821d0c323cdd" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_e1c90009-37e7-45aa-81f5-d6553037c189" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_e1c90009-37e7-45aa-81f5-d6553037c189_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_e1c90009-37e7-45aa-81f5-d6553037c189" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_e1c90009-37e7-45aa-81f5-d6553037c189_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_12740d0a-f2c4-4396-a8d2-0fb4a01fa551" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_e1c90009-37e7-45aa-81f5-d6553037c189" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_12740d0a-f2c4-4396-a8d2-0fb4a01fa551" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicConcentrationRiskMember_fe20905c-46a7-4dbc-9541-de235cf811f5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GeographicConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_12740d0a-f2c4-4396-a8d2-0fb4a01fa551" xlink:to="loc_us-gaap_GeographicConcentrationRiskMember_fe20905c-46a7-4dbc-9541-de235cf811f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfCountriesInWhichEntityOperates_61a3a591-cc35-4f41-81d7-0198ec903df9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NumberOfCountriesInWhichEntityOperates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_81655688-6590-4c81-a4f2-73418d5a86a1" xlink:to="loc_us-gaap_NumberOfCountriesInWhichEntityOperates_61a3a591-cc35-4f41-81d7-0198ec903df9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_NumberOfCountriesWhereProductFound_3dbb7b8b-0f45-48a9-9a5c-8e530bc05949" xlink:href="wab-20241231.xsd#wab_NumberOfCountriesWhereProductFound"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_81655688-6590-4c81-a4f2-73418d5a86a1" xlink:to="loc_wab_NumberOfCountriesWhereProductFound_3dbb7b8b-0f45-48a9-9a5c-8e530bc05949" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_c62f6611-b443-4ac1-a357-500b8f27c8cd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_81655688-6590-4c81-a4f2-73418d5a86a1" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_c62f6611-b443-4ac1-a357-500b8f27c8cd" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_wab_SummaryOfSignificantAccountingPoliciesLineItems_3d1629c7-f8ad-4de8-8975-637299a1f9c7" xlink:href="wab-20241231.xsd#wab_SummaryOfSignificantAccountingPoliciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_SummaryOfSignificantAccountingPoliciesTable_a2bc82b8-b6ba-4904-b8e5-a1f8e4ee7f92" xlink:href="wab-20241231.xsd#wab_SummaryOfSignificantAccountingPoliciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_wab_SummaryOfSignificantAccountingPoliciesLineItems_3d1629c7-f8ad-4de8-8975-637299a1f9c7" xlink:to="loc_wab_SummaryOfSignificantAccountingPoliciesTable_a2bc82b8-b6ba-4904-b8e5-a1f8e4ee7f92" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralAxis_8ebd12ae-89fc-4aab-ba1f-9572191ef077" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CollateralAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wab_SummaryOfSignificantAccountingPoliciesTable_a2bc82b8-b6ba-4904-b8e5-a1f8e4ee7f92" xlink:to="loc_us-gaap_CollateralAxis_8ebd12ae-89fc-4aab-ba1f-9572191ef077" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_8ebd12ae-89fc-4aab-ba1f-9572191ef077_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CollateralAxis_8ebd12ae-89fc-4aab-ba1f-9572191ef077" xlink:to="loc_us-gaap_CollateralDomain_8ebd12ae-89fc-4aab-ba1f-9572191ef077_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_6490c007-db95-4277-a3ca-c221a2a4ad80" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CollateralAxis_8ebd12ae-89fc-4aab-ba1f-9572191ef077" xlink:to="loc_us-gaap_CollateralDomain_6490c007-db95-4277-a3ca-c221a2a4ad80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralPledgedMember_11e9436c-3bbd-4364-bb42-09aca39cc08c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CollateralPledgedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollateralDomain_6490c007-db95-4277-a3ca-c221a2a4ad80" xlink:to="loc_us-gaap_CollateralPledgedMember_11e9436c-3bbd-4364-bb42-09aca39cc08c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_dcbd18ac-8880-4eb8-8f43-582f059c0708" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wab_SummaryOfSignificantAccountingPoliciesTable_a2bc82b8-b6ba-4904-b8e5-a1f8e4ee7f92" xlink:to="loc_srt_RangeAxis_dcbd18ac-8880-4eb8-8f43-582f059c0708" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_dcbd18ac-8880-4eb8-8f43-582f059c0708_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_dcbd18ac-8880-4eb8-8f43-582f059c0708" xlink:to="loc_srt_RangeMember_dcbd18ac-8880-4eb8-8f43-582f059c0708_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1d85e8d6-3bd1-4ad1-a1ed-fb9929215db3" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_dcbd18ac-8880-4eb8-8f43-582f059c0708" xlink:to="loc_srt_RangeMember_1d85e8d6-3bd1-4ad1-a1ed-fb9929215db3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_3fd81dc4-3719-4c26-9a64-d0c97bcb8858" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1d85e8d6-3bd1-4ad1-a1ed-fb9929215db3" xlink:to="loc_srt_MinimumMember_3fd81dc4-3719-4c26-9a64-d0c97bcb8858" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_20eab561-f395-4261-8a85-5c29df3907e2" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1d85e8d6-3bd1-4ad1-a1ed-fb9929215db3" xlink:to="loc_srt_MaximumMember_20eab561-f395-4261-8a85-5c29df3907e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_3acf5ede-1d31-419c-a190-a103eb948ad6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_SummaryOfSignificantAccountingPoliciesLineItems_3d1629c7-f8ad-4de8-8975-637299a1f9c7" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_3acf5ede-1d31-419c-a190-a103eb948ad6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_a7d905ea-ce5d-40ef-bc9e-d94e805b8ede" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_SummaryOfSignificantAccountingPoliciesLineItems_3d1629c7-f8ad-4de8-8975-637299a1f9c7" xlink:to="loc_us-gaap_EquityMethodInvestments_a7d905ea-ce5d-40ef-bc9e-d94e805b8ede" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_AccountReceivableSecuritizationFacilityMaximumAmount_61d0fe45-5e5f-424f-a7ab-bfa7ce0827fa" xlink:href="wab-20241231.xsd#wab_AccountReceivableSecuritizationFacilityMaximumAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_SummaryOfSignificantAccountingPoliciesLineItems_3d1629c7-f8ad-4de8-8975-637299a1f9c7" xlink:to="loc_wab_AccountReceivableSecuritizationFacilityMaximumAmount_61d0fe45-5e5f-424f-a7ab-bfa7ce0827fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_a1629593-1b94-446c-9e4d-897c694cf55e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_SummaryOfSignificantAccountingPoliciesLineItems_3d1629c7-f8ad-4de8-8975-637299a1f9c7" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_a1629593-1b94-446c-9e4d-897c694cf55e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableFromSecuritization_79e1e4b9-97b9-45f5-aa21-de4bd7c0761d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsReceivableFromSecuritization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_SummaryOfSignificantAccountingPoliciesLineItems_3d1629c7-f8ad-4de8-8975-637299a1f9c7" xlink:to="loc_us-gaap_AccountsReceivableFromSecuritization_79e1e4b9-97b9-45f5-aa21-de4bd7c0761d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreproductionCostsRelatedToLongTermSupplyArrangementsCostsCapitalized_10afc825-ec12-4997-a73a-ec51181b92c1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PreproductionCostsRelatedToLongTermSupplyArrangementsCostsCapitalized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_SummaryOfSignificantAccountingPoliciesLineItems_3d1629c7-f8ad-4de8-8975-637299a1f9c7" xlink:to="loc_us-gaap_PreproductionCostsRelatedToLongTermSupplyArrangementsCostsCapitalized_10afc825-ec12-4997-a73a-ec51181b92c1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_3a536bb6-8bd5-4a07-964b-d1d48e7e36d9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_SummaryOfSignificantAccountingPoliciesLineItems_3d1629c7-f8ad-4de8-8975-637299a1f9c7" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_3a536bb6-8bd5-4a07-964b-d1d48e7e36d9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_9883b150-acc7-4d77-ab55-46a7ddedb212" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_SummaryOfSignificantAccountingPoliciesLineItems_3d1629c7-f8ad-4de8-8975-637299a1f9c7" xlink:to="loc_us-gaap_PreferredStockSharesIssued_9883b150-acc7-4d77-ab55-46a7ddedb212" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_f28c89f4-8565-46ba-b094-75ce2a2f4cb8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_SummaryOfSignificantAccountingPoliciesLineItems_3d1629c7-f8ad-4de8-8975-637299a1f9c7" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_f28c89f4-8565-46ba-b094-75ce2a2f4cb8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_SupplyChainFinancingTerm_103312b4-264a-4cae-be94-dcbd71a2181d" xlink:href="wab-20241231.xsd#wab_SupplyChainFinancingTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_SummaryOfSignificantAccountingPoliciesLineItems_3d1629c7-f8ad-4de8-8975-637299a1f9c7" xlink:to="loc_wab_SupplyChainFinancingTerm_103312b4-264a-4cae-be94-dcbd71a2181d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplierFinanceProgramObligation_264a12b4-d1aa-4c6b-b064-00eff8861361" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SupplierFinanceProgramObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_SummaryOfSignificantAccountingPoliciesLineItems_3d1629c7-f8ad-4de8-8975-637299a1f9c7" xlink:to="loc_us-gaap_SupplierFinanceProgramObligation_264a12b4-d1aa-4c6b-b064-00eff8861361" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplierFinanceProgramObligationStatementOfFinancialPositionExtensibleEnumeration_e2647510-1394-4b0a-a9e9-c6ff01ff24e4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SupplierFinanceProgramObligationStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_SummaryOfSignificantAccountingPoliciesLineItems_3d1629c7-f8ad-4de8-8975-637299a1f9c7" xlink:to="loc_us-gaap_SupplierFinanceProgramObligationStatementOfFinancialPositionExtensibleEnumeration_e2647510-1394-4b0a-a9e9-c6ff01ff24e4" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPerformanceObligationDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPerformanceObligationDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPerformanceObligationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_8fd5d404-79e1-4304-b3eb-0b4cc5689ef5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_744d158f-44ae-48b5-9ed6-e795cb0ebda1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_8fd5d404-79e1-4304-b3eb-0b4cc5689ef5" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_744d158f-44ae-48b5-9ed6-e795cb0ebda1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_c4e49415-4a8d-4585-8068-7cb9cad1fb6d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_744d158f-44ae-48b5-9ed6-e795cb0ebda1" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_c4e49415-4a8d-4585-8068-7cb9cad1fb6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_78625393-7f16-436c-9a67-1a4f3d370042" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_8fd5d404-79e1-4304-b3eb-0b4cc5689ef5" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_78625393-7f16-436c-9a67-1a4f3d370042" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_0271b8c0-a210-49a6-9030-7b930ddb257d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_8fd5d404-79e1-4304-b3eb-0b4cc5689ef5" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_0271b8c0-a210-49a6-9030-7b930ddb257d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_d6fc0487-ad2b-4a7a-ad73-7783b498512e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_8fd5d404-79e1-4304-b3eb-0b4cc5689ef5" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_d6fc0487-ad2b-4a7a-ad73-7783b498512e" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPerformanceObligationDetails_1" xlink:type="simple" xlink:href="wab-20241231.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPerformanceObligationDetails_1"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPerformanceObligationDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_8fd5d404-79e1-4304-b3eb-0b4cc5689ef5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_744d158f-44ae-48b5-9ed6-e795cb0ebda1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_8fd5d404-79e1-4304-b3eb-0b4cc5689ef5" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_744d158f-44ae-48b5-9ed6-e795cb0ebda1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_78625393-7f16-436c-9a67-1a4f3d370042" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_8fd5d404-79e1-4304-b3eb-0b4cc5689ef5" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_78625393-7f16-436c-9a67-1a4f3d370042" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_0271b8c0-a210-49a6-9030-7b930ddb257d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_8fd5d404-79e1-4304-b3eb-0b4cc5689ef5" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_0271b8c0-a210-49a6-9030-7b930ddb257d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_d6fc0487-ad2b-4a7a-ad73-7783b498512e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_8fd5d404-79e1-4304-b3eb-0b4cc5689ef5" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_d6fc0487-ad2b-4a7a-ad73-7783b498512e" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/ACQUISITIONSNarrativeDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#ACQUISITIONSNarrativeDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/ACQUISITIONSNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_467ea962-234e-44c4-99e1-9e1af08c3b90" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_97274576-8408-40c3-8e6b-bd1a219c7f4d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_467ea962-234e-44c4-99e1-9e1af08c3b90" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_97274576-8408-40c3-8e6b-bd1a219c7f4d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_591970c9-3c81-4bf9-8df1-41816aecf0c4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_97274576-8408-40c3-8e6b-bd1a219c7f4d" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_591970c9-3c81-4bf9-8df1-41816aecf0c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_591970c9-3c81-4bf9-8df1-41816aecf0c4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_591970c9-3c81-4bf9-8df1-41816aecf0c4" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_591970c9-3c81-4bf9-8df1-41816aecf0c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7d755009-d1d8-4061-8f1d-016e934534a5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_591970c9-3c81-4bf9-8df1-41816aecf0c4" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7d755009-d1d8-4061-8f1d-016e934534a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_StrategicAcquisitionsMember_17a87610-bb39-47df-9532-28b8f84defae" xlink:href="wab-20241231.xsd#wab_StrategicAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7d755009-d1d8-4061-8f1d-016e934534a5" xlink:to="loc_wab_StrategicAcquisitionsMember_17a87610-bb39-47df-9532-28b8f84defae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_LokomotivKurastyruZauytyLKZMember_6a53866b-7f47-481e-a9bb-d7ac5b74e696" xlink:href="wab-20241231.xsd#wab_LokomotivKurastyruZauytyLKZMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7d755009-d1d8-4061-8f1d-016e934534a5" xlink:to="loc_wab_LokomotivKurastyruZauytyLKZMember_6a53866b-7f47-481e-a9bb-d7ac5b74e696" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_LMRadiatorIncMember_e5609d57-ba4d-43cb-8a08-dd782a27ab35" xlink:href="wab-20241231.xsd#wab_LMRadiatorIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7d755009-d1d8-4061-8f1d-016e934534a5" xlink:to="loc_wab_LMRadiatorIncMember_e5609d57-ba4d-43cb-8a08-dd782a27ab35" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_6dcc2285-547b-407d-9b60-7b99f5bdcedb" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_97274576-8408-40c3-8e6b-bd1a219c7f4d" xlink:to="loc_srt_ProductOrServiceAxis_6dcc2285-547b-407d-9b60-7b99f5bdcedb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_6dcc2285-547b-407d-9b60-7b99f5bdcedb_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_6dcc2285-547b-407d-9b60-7b99f5bdcedb" xlink:to="loc_srt_ProductsAndServicesDomain_6dcc2285-547b-407d-9b60-7b99f5bdcedb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_b4916919-3481-4ff1-984a-c7528fdbf6f4" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_6dcc2285-547b-407d-9b60-7b99f5bdcedb" xlink:to="loc_srt_ProductsAndServicesDomain_b4916919-3481-4ff1-984a-c7528fdbf6f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_DigitalElectronicsMember_19bcf782-93f1-4b06-95db-9309fd302a4e" xlink:href="wab-20241231.xsd#wab_DigitalElectronicsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b4916919-3481-4ff1-984a-c7528fdbf6f4" xlink:to="loc_wab_DigitalElectronicsMember_19bcf782-93f1-4b06-95db-9309fd302a4e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_DigitalElectronicsProductLineMember_64b2fffb-49f8-42e8-a14d-bf8c29a18bae" xlink:href="wab-20241231.xsd#wab_DigitalElectronicsProductLineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b4916919-3481-4ff1-984a-c7528fdbf6f4" xlink:to="loc_wab_DigitalElectronicsProductLineMember_64b2fffb-49f8-42e8-a14d-bf8c29a18bae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_ComponentsProductLineMember_f2761381-d4f5-4f30-8048-730a305bf97d" xlink:href="wab-20241231.xsd#wab_ComponentsProductLineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b4916919-3481-4ff1-984a-c7528fdbf6f4" xlink:to="loc_wab_ComponentsProductLineMember_f2761381-d4f5-4f30-8048-730a305bf97d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_ServicesProductLineMember_6d46833c-e4a2-4a66-a676-c97c9c0c2716" xlink:href="wab-20241231.xsd#wab_ServicesProductLineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b4916919-3481-4ff1-984a-c7528fdbf6f4" xlink:to="loc_wab_ServicesProductLineMember_6d46833c-e4a2-4a66-a676-c97c9c0c2716" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_f5ee1e71-2ae4-4695-a605-10b32ca8a815" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_97274576-8408-40c3-8e6b-bd1a219c7f4d" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_f5ee1e71-2ae4-4695-a605-10b32ca8a815" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_f5ee1e71-2ae4-4695-a605-10b32ca8a815_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_f5ee1e71-2ae4-4695-a605-10b32ca8a815" xlink:to="loc_us-gaap_SegmentDomain_f5ee1e71-2ae4-4695-a605-10b32ca8a815_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_05b3e459-d563-4629-b517-ff1351de4f02" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_f5ee1e71-2ae4-4695-a605-10b32ca8a815" xlink:to="loc_us-gaap_SegmentDomain_05b3e459-d563-4629-b517-ff1351de4f02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_TransitSegmentMember_19db7190-c62e-4e70-a513-dc4438e87b7a" xlink:href="wab-20241231.xsd#wab_TransitSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_05b3e459-d563-4629-b517-ff1351de4f02" xlink:to="loc_wab_TransitSegmentMember_19db7190-c62e-4e70-a513-dc4438e87b7a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_FreightSegmentMember_f99cc435-c2e5-4c75-ad94-f917bd6f17f3" xlink:href="wab-20241231.xsd#wab_FreightSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_05b3e459-d563-4629-b517-ff1351de4f02" xlink:to="loc_wab_FreightSegmentMember_f99cc435-c2e5-4c75-ad94-f917bd6f17f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_c287009d-9c86-410c-9e2b-29c19c31918e" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_97274576-8408-40c3-8e6b-bd1a219c7f4d" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_c287009d-9c86-410c-9e2b-29c19c31918e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_c287009d-9c86-410c-9e2b-29c19c31918e_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_c287009d-9c86-410c-9e2b-29c19c31918e" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_c287009d-9c86-410c-9e2b-29c19c31918e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_e18d72ca-b3ae-4939-b1fe-4c20581d4502" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_c287009d-9c86-410c-9e2b-29c19c31918e" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_e18d72ca-b3ae-4939-b1fe-4c20581d4502" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_LokomotivKurastyruZauytyLKZMember_61216a1d-5e6f-4fdd-b831-8c490678705e" xlink:href="wab-20241231.xsd#wab_LokomotivKurastyruZauytyLKZMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_e18d72ca-b3ae-4939-b1fe-4c20581d4502" xlink:to="loc_wab_LokomotivKurastyruZauytyLKZMember_61216a1d-5e6f-4fdd-b831-8c490678705e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfBusinessesAcquired_b1846c3d-4887-4109-99ca-e31e4c64cf35" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NumberOfBusinessesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_467ea962-234e-44c4-99e1-9e1af08c3b90" xlink:to="loc_us-gaap_NumberOfBusinessesAcquired_b1846c3d-4887-4109-99ca-e31e4c64cf35" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_36b749b3-f7a4-48ad-8f96-04d0573c5f60" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_467ea962-234e-44c4-99e1-9e1af08c3b90" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_36b749b3-f7a4-48ad-8f96-04d0573c5f60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_3e49600c-2dd6-42f4-9516-e4a54c4f57bb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_467ea962-234e-44c4-99e1-9e1af08c3b90" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_3e49600c-2dd6-42f4-9516-e4a54c4f57bb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_f69e398a-e9f9-4c80-a76d-0d75d2e7aee1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_467ea962-234e-44c4-99e1-9e1af08c3b90" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_f69e398a-e9f9-4c80-a76d-0d75d2e7aee1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain_db9b445f-24d3-4451-b272-411cb1375d67" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_467ea962-234e-44c4-99e1-9e1af08c3b90" xlink:to="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain_db9b445f-24d3-4451-b272-411cb1375d67" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage_c58124b0-33e7-4253-ab64-b0e02467b903" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_467ea962-234e-44c4-99e1-9e1af08c3b90" xlink:to="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage_c58124b0-33e7-4253-ab64-b0e02467b903" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/ACQUISITIONSSummaryofFairValueofAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#ACQUISITIONSSummaryofFairValueofAssetsAcquiredandLiabilitiesAssumedDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/ACQUISITIONSSummaryofFairValueofAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_423c85dc-4c3f-4adc-93dc-44321c863f51" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_30e3b2cf-50da-41ae-94c2-b81bb6286a12" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_423c85dc-4c3f-4adc-93dc-44321c863f51" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_30e3b2cf-50da-41ae-94c2-b81bb6286a12" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_4ad4181f-9016-4dcd-b76e-af3778c42a51" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_30e3b2cf-50da-41ae-94c2-b81bb6286a12" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_4ad4181f-9016-4dcd-b76e-af3778c42a51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4ad4181f-9016-4dcd-b76e-af3778c42a51_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_4ad4181f-9016-4dcd-b76e-af3778c42a51" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4ad4181f-9016-4dcd-b76e-af3778c42a51_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0aef21bb-99fd-4b05-abeb-004d5b10a16c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_4ad4181f-9016-4dcd-b76e-af3778c42a51" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0aef21bb-99fd-4b05-abeb-004d5b10a16c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_LokomotivKurastyruZauytyLKZMember_5243e61b-c1ec-461e-9e07-b63bb9553a7f" xlink:href="wab-20241231.xsd#wab_LokomotivKurastyruZauytyLKZMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0aef21bb-99fd-4b05-abeb-004d5b10a16c" xlink:to="loc_wab_LokomotivKurastyruZauytyLKZMember_5243e61b-c1ec-461e-9e07-b63bb9553a7f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_LMRadiatorIncMember_8811aa2c-adc6-453e-8d60-e95a638b4801" xlink:href="wab-20241231.xsd#wab_LMRadiatorIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0aef21bb-99fd-4b05-abeb-004d5b10a16c" xlink:to="loc_wab_LMRadiatorIncMember_8811aa2c-adc6-453e-8d60-e95a638b4801" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_48c7ae26-2746-47ea-8262-449a23a877f7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_423c85dc-4c3f-4adc-93dc-44321c863f51" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_48c7ae26-2746-47ea-8262-449a23a877f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_3d831843-94f0-4cda-ae90-2cddcf15897d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_48c7ae26-2746-47ea-8262-449a23a877f7" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_3d831843-94f0-4cda-ae90-2cddcf15897d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_342daeab-f8e9-4b4c-be61-ceb7867cf8b3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_48c7ae26-2746-47ea-8262-449a23a877f7" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_342daeab-f8e9-4b4c-be61-ceb7867cf8b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_5227e7c8-3fa5-46d0-9fe1-bde7b23d58ab" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_48c7ae26-2746-47ea-8262-449a23a877f7" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_5227e7c8-3fa5-46d0-9fe1-bde7b23d58ab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_b3eb2123-c038-4071-98e5-6da64404b831" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_48c7ae26-2746-47ea-8262-449a23a877f7" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_b3eb2123-c038-4071-98e5-6da64404b831" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_929f67e5-e59f-4021-82ea-e2f55ef4c718" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_48c7ae26-2746-47ea-8262-449a23a877f7" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_929f67e5-e59f-4021-82ea-e2f55ef4c718" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_c9224952-a39c-41d2-9960-637f9153dbb4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_48c7ae26-2746-47ea-8262-449a23a877f7" xlink:to="loc_us-gaap_Goodwill_c9224952-a39c-41d2-9960-637f9153dbb4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_f8ed9761-8e05-40db-b160-3d3048b10df1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_48c7ae26-2746-47ea-8262-449a23a877f7" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_f8ed9761-8e05-40db-b160-3d3048b10df1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_02e512cd-c60d-4a68-ad87-15629eb2ef3b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_48c7ae26-2746-47ea-8262-449a23a877f7" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_02e512cd-c60d-4a68-ad87-15629eb2ef3b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill_5db912a3-f95f-42d1-b00c-d0e21c1f9a31" xlink:href="wab-20241231.xsd#wab_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_48c7ae26-2746-47ea-8262-449a23a877f7" xlink:to="loc_wab_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill_5db912a3-f95f-42d1-b00c-d0e21c1f9a31" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_d6d51f6f-1c25-41aa-8701-ec73aef36269" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_423c85dc-4c3f-4adc-93dc-44321c863f51" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_d6d51f6f-1c25-41aa-8701-ec73aef36269" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities_fc625196-9b97-4cc7-bb68-c970a1f75e19" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_d6d51f6f-1c25-41aa-8701-ec73aef36269" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities_fc625196-9b97-4cc7-bb68-c970a1f75e19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities_085f5dca-8239-4bb2-9300-68886c1c7cca" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_d6d51f6f-1c25-41aa-8701-ec73aef36269" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities_085f5dca-8239-4bb2-9300-68886c1c7cca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_09829df4-7ca3-46b2-a4d1-2c5995114bb0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_d6d51f6f-1c25-41aa-8701-ec73aef36269" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_09829df4-7ca3-46b2-a4d1-2c5995114bb0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_0dc612d9-663d-4391-89d1-d9049bd91013" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_423c85dc-4c3f-4adc-93dc-44321c863f51" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_0dc612d9-663d-4391-89d1-d9049bd91013" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/PROPERTYPLANTEQUIPMENTEstimatedUsefulLivesofPropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#PROPERTYPLANTEQUIPMENTEstimatedUsefulLivesofPropertyPlantandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/PROPERTYPLANTEQUIPMENTEstimatedUsefulLivesofPropertyPlantandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_1bd1d987-76aa-452f-84b8-c8e05f78a56f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_eb7e8d95-5fbb-48fe-a706-4de822b4368c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_1bd1d987-76aa-452f-84b8-c8e05f78a56f" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_eb7e8d95-5fbb-48fe-a706-4de822b4368c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_803a4dd9-9128-4c60-bff3-d5e30bd949c8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_eb7e8d95-5fbb-48fe-a706-4de822b4368c" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_803a4dd9-9128-4c60-bff3-d5e30bd949c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_803a4dd9-9128-4c60-bff3-d5e30bd949c8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_803a4dd9-9128-4c60-bff3-d5e30bd949c8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_803a4dd9-9128-4c60-bff3-d5e30bd949c8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_31e5b16b-7e34-4f9f-b9e4-c7c6cc84c2a7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_803a4dd9-9128-4c60-bff3-d5e30bd949c8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_31e5b16b-7e34-4f9f-b9e4-c7c6cc84c2a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandImprovementsMember_1beebbb1-7224-47e0-91fc-3224a68e4e34" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LandImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_31e5b16b-7e34-4f9f-b9e4-c7c6cc84c2a7" xlink:to="loc_us-gaap_LandImprovementsMember_1beebbb1-7224-47e0-91fc-3224a68e4e34" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_67f22379-6f8a-47c2-98c6-e90481dd8e98" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BuildingAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_31e5b16b-7e34-4f9f-b9e4-c7c6cc84c2a7" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_67f22379-6f8a-47c2-98c6-e90481dd8e98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_bb1cae34-cac9-43be-8039-87e26d81dd1b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_MachineryAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_31e5b16b-7e34-4f9f-b9e4-c7c6cc84c2a7" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_bb1cae34-cac9-43be-8039-87e26d81dd1b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_7f74bbc8-475e-4cde-86d3-a84c29af7e3e" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_eb7e8d95-5fbb-48fe-a706-4de822b4368c" xlink:to="loc_srt_RangeAxis_7f74bbc8-475e-4cde-86d3-a84c29af7e3e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_7f74bbc8-475e-4cde-86d3-a84c29af7e3e_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_7f74bbc8-475e-4cde-86d3-a84c29af7e3e" xlink:to="loc_srt_RangeMember_7f74bbc8-475e-4cde-86d3-a84c29af7e3e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_34217fb9-d4f3-4c04-80e4-8c69dfe5110f" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_7f74bbc8-475e-4cde-86d3-a84c29af7e3e" xlink:to="loc_srt_RangeMember_34217fb9-d4f3-4c04-80e4-8c69dfe5110f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_fd1fb891-489f-444f-ad2e-986c9312690d" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_34217fb9-d4f3-4c04-80e4-8c69dfe5110f" xlink:to="loc_srt_MinimumMember_fd1fb891-489f-444f-ad2e-986c9312690d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_a499339b-c4f4-4406-a297-131148bcff81" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_34217fb9-d4f3-4c04-80e4-8c69dfe5110f" xlink:to="loc_srt_MaximumMember_a499339b-c4f4-4406-a297-131148bcff81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_889b30cb-da04-4b79-8a8b-9d71dcf85a76" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_1bd1d987-76aa-452f-84b8-c8e05f78a56f" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_889b30cb-da04-4b79-8a8b-9d71dcf85a76" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/GOODWILLANDINTANGIBLEASSETSNarrativeDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#GOODWILLANDINTANGIBLEASSETSNarrativeDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/GOODWILLANDINTANGIBLEASSETSNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_wab_IntangibleAssetsDisclosureLineItems_0ba675b6-54f3-4b54-9505-3f9c3818a8b1" xlink:href="wab-20241231.xsd#wab_IntangibleAssetsDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_IntangibleAssetsDisclosureTable_5f0182ce-f6e8-4be4-a307-47b0aff66a2a" xlink:href="wab-20241231.xsd#wab_IntangibleAssetsDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_wab_IntangibleAssetsDisclosureLineItems_0ba675b6-54f3-4b54-9505-3f9c3818a8b1" xlink:to="loc_wab_IntangibleAssetsDisclosureTable_5f0182ce-f6e8-4be4-a307-47b0aff66a2a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_5b6aeaaf-02f9-40bc-888d-ac60591d4bc9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wab_IntangibleAssetsDisclosureTable_5f0182ce-f6e8-4be4-a307-47b0aff66a2a" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_5b6aeaaf-02f9-40bc-888d-ac60591d4bc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_5b6aeaaf-02f9-40bc-888d-ac60591d4bc9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_5b6aeaaf-02f9-40bc-888d-ac60591d4bc9" xlink:to="loc_us-gaap_SegmentDomain_5b6aeaaf-02f9-40bc-888d-ac60591d4bc9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_95bb0e3b-b9bb-4af0-ae00-68e001c01dca" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_5b6aeaaf-02f9-40bc-888d-ac60591d4bc9" xlink:to="loc_us-gaap_SegmentDomain_95bb0e3b-b9bb-4af0-ae00-68e001c01dca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_FreightSegmentMember_4231a1a1-7587-4bc0-a648-267108c466b7" xlink:href="wab-20241231.xsd#wab_FreightSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_95bb0e3b-b9bb-4af0-ae00-68e001c01dca" xlink:to="loc_wab_FreightSegmentMember_4231a1a1-7587-4bc0-a648-267108c466b7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_f05e3005-82f2-44ac-9cb0-b033cb004a1c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wab_IntangibleAssetsDisclosureTable_5f0182ce-f6e8-4be4-a307-47b0aff66a2a" xlink:to="loc_us-gaap_ValuationTechniqueAxis_f05e3005-82f2-44ac-9cb0-b033cb004a1c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_f05e3005-82f2-44ac-9cb0-b033cb004a1c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_f05e3005-82f2-44ac-9cb0-b033cb004a1c" xlink:to="loc_us-gaap_ValuationTechniqueDomain_f05e3005-82f2-44ac-9cb0-b033cb004a1c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_8d3fb377-991c-4818-b332-f35ee816d898" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_f05e3005-82f2-44ac-9cb0-b033cb004a1c" xlink:to="loc_us-gaap_ValuationTechniqueDomain_8d3fb377-991c-4818-b332-f35ee816d898" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_3147bb50-9f17-4311-80bb-0dca4d907d16" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_8d3fb377-991c-4818-b332-f35ee816d898" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_3147bb50-9f17-4311-80bb-0dca4d907d16" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketApproachValuationTechniqueMember_99c53c06-d36e-4615-91c4-905f267822e6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_MarketApproachValuationTechniqueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_8d3fb377-991c-4818-b332-f35ee816d898" xlink:to="loc_us-gaap_MarketApproachValuationTechniqueMember_99c53c06-d36e-4615-91c4-905f267822e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_f385ef7a-2b6b-48f4-aa63-923ee2609695" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wab_IntangibleAssetsDisclosureTable_5f0182ce-f6e8-4be4-a307-47b0aff66a2a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_f385ef7a-2b6b-48f4-aa63-923ee2609695" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_f385ef7a-2b6b-48f4-aa63-923ee2609695_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_f385ef7a-2b6b-48f4-aa63-923ee2609695" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_f385ef7a-2b6b-48f4-aa63-923ee2609695_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a942f75c-6c36-410c-a30e-c6ac7da0fc06" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_f385ef7a-2b6b-48f4-aa63-923ee2609695" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a942f75c-6c36-410c-a30e-c6ac7da0fc06" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_73c3f2a7-fdd1-4c86-82f4-25a1230f455b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a942f75c-6c36-410c-a30e-c6ac7da0fc06" xlink:to="loc_us-gaap_TradeNamesMember_73c3f2a7-fdd1-4c86-82f4-25a1230f455b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrderOrProductionBacklogMember_908ca1b1-38f0-49dd-8991-3f6a9b43ae80" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OrderOrProductionBacklogMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a942f75c-6c36-410c-a30e-c6ac7da0fc06" xlink:to="loc_us-gaap_OrderOrProductionBacklogMember_908ca1b1-38f0-49dd-8991-3f6a9b43ae80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_e439343e-764f-4dfd-bbef-9a7a2e3a9e6d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a942f75c-6c36-410c-a30e-c6ac7da0fc06" xlink:to="loc_us-gaap_CustomerRelationshipsMember_e439343e-764f-4dfd-bbef-9a7a2e3a9e6d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_0cd68941-7546-4f54-9f44-379139ad52bb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TechnologyBasedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a942f75c-6c36-410c-a30e-c6ac7da0fc06" xlink:to="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_0cd68941-7546-4f54-9f44-379139ad52bb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportingUnits_49ed3372-2d1a-4c72-adb6-72fb03e67cea" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NumberOfReportingUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_IntangibleAssetsDisclosureLineItems_0ba675b6-54f3-4b54-9505-3f9c3818a8b1" xlink:to="loc_us-gaap_NumberOfReportingUnits_49ed3372-2d1a-4c72-adb6-72fb03e67cea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_GoodwillImpairmentTestWeightOfApproach_6ba404bb-726c-4d4c-a82c-8eaf28f85a52" xlink:href="wab-20241231.xsd#wab_GoodwillImpairmentTestWeightOfApproach"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_IntangibleAssetsDisclosureLineItems_0ba675b6-54f3-4b54-9505-3f9c3818a8b1" xlink:to="loc_wab_GoodwillImpairmentTestWeightOfApproach_6ba404bb-726c-4d4c-a82c-8eaf28f85a52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_ed814c11-a034-4bb3-9313-bb39c4b4ff09" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ImpairmentOfIntangibleAssetsFinitelived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_IntangibleAssetsDisclosureLineItems_0ba675b6-54f3-4b54-9505-3f9c3818a8b1" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_ed814c11-a034-4bb3-9313-bb39c4b4ff09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedTradeNames_5a681391-c492-4347-8a58-3ee4cf202913" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IndefiniteLivedTradeNames"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_IntangibleAssetsDisclosureLineItems_0ba675b6-54f3-4b54-9505-3f9c3818a8b1" xlink:to="loc_us-gaap_IndefiniteLivedTradeNames_5a681391-c492-4347-8a58-3ee4cf202913" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_9abe48b8-861b-4f16-9dc6-428b462dac5b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_IntangibleAssetsDisclosureLineItems_0ba675b6-54f3-4b54-9505-3f9c3818a8b1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_9abe48b8-861b-4f16-9dc6-428b462dac5b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1_09aa16bc-7f29-4a3b-af4f-280a122bf3fb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_IntangibleAssetsDisclosureLineItems_0ba675b6-54f3-4b54-9505-3f9c3818a8b1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1_09aa16bc-7f29-4a3b-af4f-280a122bf3fb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_8e633248-2901-45c5-b0fc-e07d71d9217e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_IntangibleAssetsDisclosureLineItems_0ba675b6-54f3-4b54-9505-3f9c3818a8b1" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_8e633248-2901-45c5-b0fc-e07d71d9217e" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/GOODWILLANDINTANGIBLEASSETSSummaryofChangeintheCarryingAmountofGoodwillbySegmentDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#GOODWILLANDINTANGIBLEASSETSSummaryofChangeintheCarryingAmountofGoodwillbySegmentDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/GOODWILLANDINTANGIBLEASSETSSummaryofChangeintheCarryingAmountofGoodwillbySegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_e04f0a16-6d04-4836-8312-2379baaa591a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_39a62674-c8f9-4e5e-8ee9-b174e6d47001" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_e04f0a16-6d04-4836-8312-2379baaa591a" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_39a62674-c8f9-4e5e-8ee9-b174e6d47001" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_5f4c54c9-74b0-4183-b48b-d109ce03b0af" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_39a62674-c8f9-4e5e-8ee9-b174e6d47001" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_5f4c54c9-74b0-4183-b48b-d109ce03b0af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_5f4c54c9-74b0-4183-b48b-d109ce03b0af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_5f4c54c9-74b0-4183-b48b-d109ce03b0af" xlink:to="loc_us-gaap_SegmentDomain_5f4c54c9-74b0-4183-b48b-d109ce03b0af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_cd7ba1c6-28a0-4a21-b353-4bc209ddc017" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_5f4c54c9-74b0-4183-b48b-d109ce03b0af" xlink:to="loc_us-gaap_SegmentDomain_cd7ba1c6-28a0-4a21-b353-4bc209ddc017" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_FreightSegmentMember_bc2c72ec-9b44-4778-92ef-5a92abffd752" xlink:href="wab-20241231.xsd#wab_FreightSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cd7ba1c6-28a0-4a21-b353-4bc209ddc017" xlink:to="loc_wab_FreightSegmentMember_bc2c72ec-9b44-4778-92ef-5a92abffd752" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_TransitSegmentMember_5c895015-8222-4baa-bf92-7c82985c1fc3" xlink:href="wab-20241231.xsd#wab_TransitSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cd7ba1c6-28a0-4a21-b353-4bc209ddc017" xlink:to="loc_wab_TransitSegmentMember_5c895015-8222-4baa-bf92-7c82985c1fc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_5118106d-3acc-4a6a-8eb6-4ef5188fb64d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_e04f0a16-6d04-4836-8312-2379baaa591a" xlink:to="loc_us-gaap_GoodwillRollForward_5118106d-3acc-4a6a-8eb6-4ef5188fb64d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_888db844-e81e-47d3-82e2-661ef0eb1065" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_5118106d-3acc-4a6a-8eb6-4ef5188fb64d" xlink:to="loc_us-gaap_Goodwill_888db844-e81e-47d3-82e2-661ef0eb1065" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_b0dd18e5-78cd-4f98-a2eb-08d799a0d5b3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_5118106d-3acc-4a6a-8eb6-4ef5188fb64d" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_b0dd18e5-78cd-4f98-a2eb-08d799a0d5b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_66a51862-99a9-495b-ac89-6610d24f423f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_5118106d-3acc-4a6a-8eb6-4ef5188fb64d" xlink:to="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_66a51862-99a9-495b-ac89-6610d24f423f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_d4c30703-f900-4c30-8cf9-ddd2dd1994cf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_5118106d-3acc-4a6a-8eb6-4ef5188fb64d" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_d4c30703-f900-4c30-8cf9-ddd2dd1994cf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_97b71644-dd57-4dba-bb53-51ffdb5d3e47" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Goodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/GOODWILLANDINTANGIBLEASSETSSummaryofIntangibleAssetsOtherThanGoodwillandTrademarksDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#GOODWILLANDINTANGIBLEASSETSSummaryofIntangibleAssetsOtherThanGoodwillandTrademarksDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/GOODWILLANDINTANGIBLEASSETSSummaryofIntangibleAssetsOtherThanGoodwillandTrademarksDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0ec79b67-c4de-40aa-b402-3603bce4d28a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_085650d1-ec81-4abb-848b-6656044ff43e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0ec79b67-c4de-40aa-b402-3603bce4d28a" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_085650d1-ec81-4abb-848b-6656044ff43e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_9dd2d000-ed92-41a5-ae86-1113ac8bbfee" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_085650d1-ec81-4abb-848b-6656044ff43e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_9dd2d000-ed92-41a5-ae86-1113ac8bbfee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9dd2d000-ed92-41a5-ae86-1113ac8bbfee_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_9dd2d000-ed92-41a5-ae86-1113ac8bbfee" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9dd2d000-ed92-41a5-ae86-1113ac8bbfee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a24a6c34-99fe-4078-9377-53b20fb4c2a2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_9dd2d000-ed92-41a5-ae86-1113ac8bbfee" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a24a6c34-99fe-4078-9377-53b20fb4c2a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrderOrProductionBacklogMember_bab3c79b-5032-48a2-9c70-a8ae6d1ae644" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OrderOrProductionBacklogMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a24a6c34-99fe-4078-9377-53b20fb4c2a2" xlink:to="loc_us-gaap_OrderOrProductionBacklogMember_bab3c79b-5032-48a2-9c70-a8ae6d1ae644" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_18886432-7c64-4b91-9727-521fb961b30b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a24a6c34-99fe-4078-9377-53b20fb4c2a2" xlink:to="loc_us-gaap_CustomerRelationshipsMember_18886432-7c64-4b91-9727-521fb961b30b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyEquipmentMember_d3a3c35f-201f-4d90-9477-5c18d9e6e7f9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TechnologyEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a24a6c34-99fe-4078-9377-53b20fb4c2a2" xlink:to="loc_us-gaap_TechnologyEquipmentMember_d3a3c35f-201f-4d90-9477-5c18d9e6e7f9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_757239d3-e8d9-4926-b73b-88619e36fb0a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0ec79b67-c4de-40aa-b402-3603bce4d28a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_757239d3-e8d9-4926-b73b-88619e36fb0a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_715167d4-daa4-4cef-8369-ba341302d582" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0ec79b67-c4de-40aa-b402-3603bce4d28a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_715167d4-daa4-4cef-8369-ba341302d582" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_642437c8-b455-4e05-b66f-cb4ec3ceb50c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0ec79b67-c4de-40aa-b402-3603bce4d28a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_642437c8-b455-4e05-b66f-cb4ec3ceb50c" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/LONGTERMDEBTSummaryofLongtermDebtDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#LONGTERMDEBTSummaryofLongtermDebtDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/LONGTERMDEBTSummaryofLongtermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_acbab2f9-ad45-455e-a811-554c2d609f15" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_3c2dee33-5b3a-4793-904c-c0456813f03c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_acbab2f9-ad45-455e-a811-554c2d609f15" xlink:to="loc_us-gaap_DebtInstrumentTable_3c2dee33-5b3a-4793-904c-c0456813f03c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_b6e93d0d-967d-49cf-9344-4470fe4a8bcd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3c2dee33-5b3a-4793-904c-c0456813f03c" xlink:to="loc_us-gaap_CreditFacilityAxis_b6e93d0d-967d-49cf-9344-4470fe4a8bcd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_b6e93d0d-967d-49cf-9344-4470fe4a8bcd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_b6e93d0d-967d-49cf-9344-4470fe4a8bcd" xlink:to="loc_us-gaap_CreditFacilityDomain_b6e93d0d-967d-49cf-9344-4470fe4a8bcd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_a66b6b02-52eb-4e5a-84c8-8cf13b21c5a9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_b6e93d0d-967d-49cf-9344-4470fe4a8bcd" xlink:to="loc_us-gaap_CreditFacilityDomain_a66b6b02-52eb-4e5a-84c8-8cf13b21c5a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_4c6200b9-5930-4a9b-9efe-db06dac28f55" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_a66b6b02-52eb-4e5a-84c8-8cf13b21c5a9" xlink:to="loc_us-gaap_SecuredDebtMember_4c6200b9-5930-4a9b-9efe-db06dac28f55" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_2e74990d-85e5-4412-8562-c9d17ed59954" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_a66b6b02-52eb-4e5a-84c8-8cf13b21c5a9" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_2e74990d-85e5-4412-8562-c9d17ed59954" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_eb10bf58-4135-4bab-bfc2-126d94e79f88" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3c2dee33-5b3a-4793-904c-c0456813f03c" xlink:to="loc_us-gaap_DebtInstrumentAxis_eb10bf58-4135-4bab-bfc2-126d94e79f88" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_eb10bf58-4135-4bab-bfc2-126d94e79f88_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_eb10bf58-4135-4bab-bfc2-126d94e79f88" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_eb10bf58-4135-4bab-bfc2-126d94e79f88_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_6952772e-e2a7-4e9b-a63b-84c7ae38f912" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_eb10bf58-4135-4bab-bfc2-126d94e79f88" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_6952772e-e2a7-4e9b-a63b-84c7ae38f912" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_A2024CreditAgreementMember_123385c8-c92b-4fbb-ab02-6c0d0816f016" xlink:href="wab-20241231.xsd#wab_A2024CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6952772e-e2a7-4e9b-a63b-84c7ae38f912" xlink:to="loc_wab_A2024CreditAgreementMember_123385c8-c92b-4fbb-ab02-6c0d0816f016" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_MultiCurrencyRevolvingLoanFacilityMember_9403ad4f-9500-4e4e-b522-86b5fe0f5044" xlink:href="wab-20241231.xsd#wab_MultiCurrencyRevolvingLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6952772e-e2a7-4e9b-a63b-84c7ae38f912" xlink:to="loc_wab_MultiCurrencyRevolvingLoanFacilityMember_9403ad4f-9500-4e4e-b522-86b5fe0f5044" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_RestatedCreditAgreementMember_f5cd0f3d-57ff-45cb-ac72-8e98b0fc5519" xlink:href="wab-20241231.xsd#wab_RestatedCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6952772e-e2a7-4e9b-a63b-84c7ae38f912" xlink:to="loc_wab_RestatedCreditAgreementMember_f5cd0f3d-57ff-45cb-ac72-8e98b0fc5519" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_A4150PercentSeniorNotesDueTwoThousandAndTwentyFourMember_f556c677-6ebf-4944-b706-5be646e05b81" xlink:href="wab-20241231.xsd#wab_A4150PercentSeniorNotesDueTwoThousandAndTwentyFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6952772e-e2a7-4e9b-a63b-84c7ae38f912" xlink:to="loc_wab_A4150PercentSeniorNotesDueTwoThousandAndTwentyFourMember_f556c677-6ebf-4944-b706-5be646e05b81" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_A32000PercentSeniorNotesDueTwoThousandAndTwentyFiveMember_5f563cb0-f0c7-48fb-8cb2-86c8c0768e69" xlink:href="wab-20241231.xsd#wab_A32000PercentSeniorNotesDueTwoThousandAndTwentyFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6952772e-e2a7-4e9b-a63b-84c7ae38f912" xlink:to="loc_wab_A32000PercentSeniorNotesDueTwoThousandAndTwentyFiveMember_5f563cb0-f0c7-48fb-8cb2-86c8c0768e69" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_A3.45PercentSeniorNotesDueTwoThousandandTwentySixMember_5cb99730-0430-4dd3-a4dc-8ef37e0d7fef" xlink:href="wab-20241231.xsd#wab_A3.45PercentSeniorNotesDueTwoThousandandTwentySixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6952772e-e2a7-4e9b-a63b-84c7ae38f912" xlink:to="loc_wab_A3.45PercentSeniorNotesDueTwoThousandandTwentySixMember_5cb99730-0430-4dd3-a4dc-8ef37e0d7fef" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_A125PercentSeniorNotesDueTwoThousandAndTwentySevenMember_d0cac0bb-cf68-47a8-9586-9094f1538272" xlink:href="wab-20241231.xsd#wab_A125PercentSeniorNotesDueTwoThousandAndTwentySevenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6952772e-e2a7-4e9b-a63b-84c7ae38f912" xlink:to="loc_wab_A125PercentSeniorNotesDueTwoThousandAndTwentySevenMember_d0cac0bb-cf68-47a8-9586-9094f1538272" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_A470PercentSeniorNotesDueTwoThousandAndTwentyEightMember_2c47bf8b-646e-47e1-bcbe-125ad6970374" xlink:href="wab-20241231.xsd#wab_A470PercentSeniorNotesDueTwoThousandAndTwentyEightMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6952772e-e2a7-4e9b-a63b-84c7ae38f912" xlink:to="loc_wab_A470PercentSeniorNotesDueTwoThousandAndTwentyEightMember_2c47bf8b-646e-47e1-bcbe-125ad6970374" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_A5.611PercentSeniorNotesDueTwoThousandAndThirtyFourMember_eeded3d8-cd4d-4dbb-a5ad-8fcd2778e07f" xlink:href="wab-20241231.xsd#wab_A5.611PercentSeniorNotesDueTwoThousandAndThirtyFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6952772e-e2a7-4e9b-a63b-84c7ae38f912" xlink:to="loc_wab_A5.611PercentSeniorNotesDueTwoThousandAndThirtyFourMember_eeded3d8-cd4d-4dbb-a5ad-8fcd2778e07f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_a563e12f-9592-4c66-a9e7-cd65f769ec06" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3c2dee33-5b3a-4793-904c-c0456813f03c" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_a563e12f-9592-4c66-a9e7-cd65f769ec06" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_a563e12f-9592-4c66-a9e7-cd65f769ec06_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_a563e12f-9592-4c66-a9e7-cd65f769ec06" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_a563e12f-9592-4c66-a9e7-cd65f769ec06_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_b54a67f4-aa4e-4ec6-aa25-9c1977a767ba" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_a563e12f-9592-4c66-a9e7-cd65f769ec06" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_b54a67f4-aa4e-4ec6-aa25-9c1977a767ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_022f6f43-9c2c-4e74-a5c7-b4165b4e9361" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_b54a67f4-aa4e-4ec6-aa25-9c1977a767ba" xlink:to="loc_us-gaap_LineOfCreditMember_022f6f43-9c2c-4e74-a5c7-b4165b4e9361" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_44b56eb2-c911-4e2f-b052-ed5f27e6acb6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_b54a67f4-aa4e-4ec6-aa25-9c1977a767ba" xlink:to="loc_us-gaap_SeniorNotesMember_44b56eb2-c911-4e2f-b052-ed5f27e6acb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDebtSecuritiesMember_d9a8dab9-c5fe-44e5-b333-f680cb1288db" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_b54a67f4-aa4e-4ec6-aa25-9c1977a767ba" xlink:to="loc_us-gaap_OtherDebtSecuritiesMember_d9a8dab9-c5fe-44e5-b333-f680cb1288db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_cbf13a6d-49f9-4d0c-9fbf-96923c2f9d12" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3c2dee33-5b3a-4793-904c-c0456813f03c" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_cbf13a6d-49f9-4d0c-9fbf-96923c2f9d12" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_cbf13a6d-49f9-4d0c-9fbf-96923c2f9d12_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_cbf13a6d-49f9-4d0c-9fbf-96923c2f9d12" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_cbf13a6d-49f9-4d0c-9fbf-96923c2f9d12_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_fec9bf67-c1b8-4172-afe3-38770e6558f4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_cbf13a6d-49f9-4d0c-9fbf-96923c2f9d12" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_fec9bf67-c1b8-4172-afe3-38770e6558f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_dac8e7e2-5b49-4466-b56b-6d2d38cba41b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_fec9bf67-c1b8-4172-afe3-38770e6558f4" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_dac8e7e2-5b49-4466-b56b-6d2d38cba41b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_6540e750-5b7f-4232-a896-9c1c238ffea9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_dac8e7e2-5b49-4466-b56b-6d2d38cba41b" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_6540e750-5b7f-4232-a896-9c1c238ffea9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_f577fdf8-0083-4817-8fdf-9feafaea3af2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_acbab2f9-ad45-455e-a811-554c2d609f15" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_f577fdf8-0083-4817-8fdf-9feafaea3af2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_8a43100d-3105-46d3-9ba5-8d203fe3e473" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_acbab2f9-ad45-455e-a811-554c2d609f15" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_8a43100d-3105-46d3-9ba5-8d203fe3e473" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_380f8da1-28fb-4eb5-b6fd-0e08c52a9870" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_acbab2f9-ad45-455e-a811-554c2d609f15" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_380f8da1-28fb-4eb5-b6fd-0e08c52a9870" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_32b0dd81-8f8b-4556-8586-50a79e1bcea7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_acbab2f9-ad45-455e-a811-554c2d609f15" xlink:to="loc_us-gaap_LongTermDebt_32b0dd81-8f8b-4556-8586-50a79e1bcea7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_a10a9cb7-e694-4dd6-b2a7-ee443ae6b973" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_acbab2f9-ad45-455e-a811-554c2d609f15" xlink:to="loc_us-gaap_LongTermDebtCurrent_a10a9cb7-e694-4dd6-b2a7-ee443ae6b973" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_1caa67b5-547a-4dfc-9dfd-9d6d4f50de8a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_acbab2f9-ad45-455e-a811-554c2d609f15" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_1caa67b5-547a-4dfc-9dfd-9d6d4f50de8a" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/LONGTERMDEBTNarrativeDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#LONGTERMDEBTNarrativeDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/LONGTERMDEBTNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_c385cb17-f12a-49ad-b902-35061b17a8b1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_us-gaap_DebtInstrumentTable_c385cb17-f12a-49ad-b902-35061b17a8b1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_f5194058-edc0-417c-a933-0d1a2f31755f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c385cb17-f12a-49ad-b902-35061b17a8b1" xlink:to="loc_us-gaap_CreditFacilityAxis_f5194058-edc0-417c-a933-0d1a2f31755f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_f5194058-edc0-417c-a933-0d1a2f31755f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_f5194058-edc0-417c-a933-0d1a2f31755f" xlink:to="loc_us-gaap_CreditFacilityDomain_f5194058-edc0-417c-a933-0d1a2f31755f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_8ad8cf10-150b-42ff-80f0-94173c12095f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_f5194058-edc0-417c-a933-0d1a2f31755f" xlink:to="loc_us-gaap_CreditFacilityDomain_8ad8cf10-150b-42ff-80f0-94173c12095f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_de5de23f-c7bd-4ff5-903b-596c969cb419" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_8ad8cf10-150b-42ff-80f0-94173c12095f" xlink:to="loc_us-gaap_SecuredDebtMember_de5de23f-c7bd-4ff5-903b-596c969cb419" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_4cdd0a14-06d3-4faa-a0f3-6f35a5413e4b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_8ad8cf10-150b-42ff-80f0-94173c12095f" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_4cdd0a14-06d3-4faa-a0f3-6f35a5413e4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_202588dd-67d2-4d11-ba1a-09199ef28e88" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_8ad8cf10-150b-42ff-80f0-94173c12095f" xlink:to="loc_us-gaap_LineOfCreditMember_202588dd-67d2-4d11-ba1a-09199ef28e88" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_61367c07-8929-43fc-8f9d-275068bd9374" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c385cb17-f12a-49ad-b902-35061b17a8b1" xlink:to="loc_us-gaap_DebtInstrumentAxis_61367c07-8929-43fc-8f9d-275068bd9374" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_61367c07-8929-43fc-8f9d-275068bd9374_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_61367c07-8929-43fc-8f9d-275068bd9374" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_61367c07-8929-43fc-8f9d-275068bd9374_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_cb3a0923-e967-47dd-a72b-f8e759a22439" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_61367c07-8929-43fc-8f9d-275068bd9374" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_cb3a0923-e967-47dd-a72b-f8e759a22439" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_A2024CreditAgreementMember_5fae6739-68f9-4e1c-a42d-f5105182cd64" xlink:href="wab-20241231.xsd#wab_A2024CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb3a0923-e967-47dd-a72b-f8e759a22439" xlink:to="loc_wab_A2024CreditAgreementMember_5fae6739-68f9-4e1c-a42d-f5105182cd64" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_RestatedCreditAgreementMember_fb86a5fe-f3cb-45a9-9c11-2a1056bf5363" xlink:href="wab-20241231.xsd#wab_RestatedCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb3a0923-e967-47dd-a72b-f8e759a22439" xlink:to="loc_wab_RestatedCreditAgreementMember_fb86a5fe-f3cb-45a9-9c11-2a1056bf5363" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_A4375PercentSeniorNotesDueTwoThousandAndTwentyThreeMember_321c63b1-55ac-4695-8e18-9b330dc86fc3" xlink:href="wab-20241231.xsd#wab_A4375PercentSeniorNotesDueTwoThousandAndTwentyThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb3a0923-e967-47dd-a72b-f8e759a22439" xlink:to="loc_wab_A4375PercentSeniorNotesDueTwoThousandAndTwentyThreeMember_321c63b1-55ac-4695-8e18-9b330dc86fc3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_TwoThousandandEighteenRefinancingAgreementMember_b25cc7ed-da34-4101-9972-fed797fb7f62" xlink:href="wab-20241231.xsd#wab_TwoThousandandEighteenRefinancingAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb3a0923-e967-47dd-a72b-f8e759a22439" xlink:to="loc_wab_TwoThousandandEighteenRefinancingAgreementMember_b25cc7ed-da34-4101-9972-fed797fb7f62" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_UncommitedMoneyMarketLineCreditAgreementMember_8fe9d71f-0afe-497d-b1d8-46e0c4802012" xlink:href="wab-20241231.xsd#wab_UncommitedMoneyMarketLineCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb3a0923-e967-47dd-a72b-f8e759a22439" xlink:to="loc_wab_UncommitedMoneyMarketLineCreditAgreementMember_8fe9d71f-0afe-497d-b1d8-46e0c4802012" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_A4150PercentSeniorNotesDueTwoThousandAndTwentyFourMember_5f45d656-f38d-44f9-9fd6-a05b78709f68" xlink:href="wab-20241231.xsd#wab_A4150PercentSeniorNotesDueTwoThousandAndTwentyFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb3a0923-e967-47dd-a72b-f8e759a22439" xlink:to="loc_wab_A4150PercentSeniorNotesDueTwoThousandAndTwentyFourMember_5f45d656-f38d-44f9-9fd6-a05b78709f68" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_A32000PercentSeniorNotesDueTwoThousandAndTwentyFiveMember_16d34147-7462-40fd-aa60-39361eadb96c" xlink:href="wab-20241231.xsd#wab_A32000PercentSeniorNotesDueTwoThousandAndTwentyFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb3a0923-e967-47dd-a72b-f8e759a22439" xlink:to="loc_wab_A32000PercentSeniorNotesDueTwoThousandAndTwentyFiveMember_16d34147-7462-40fd-aa60-39361eadb96c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_A3.45PercentSeniorNotesDueTwoThousandandTwentySixMember_7ca8bafb-ba2d-47b2-8e45-fc1b116f756a" xlink:href="wab-20241231.xsd#wab_A3.45PercentSeniorNotesDueTwoThousandandTwentySixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb3a0923-e967-47dd-a72b-f8e759a22439" xlink:to="loc_wab_A3.45PercentSeniorNotesDueTwoThousandandTwentySixMember_7ca8bafb-ba2d-47b2-8e45-fc1b116f756a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_A125PercentSeniorNotesDueTwoThousandAndTwentySevenMember_c0891645-56d1-47e8-9644-6452c5ab4df2" xlink:href="wab-20241231.xsd#wab_A125PercentSeniorNotesDueTwoThousandAndTwentySevenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb3a0923-e967-47dd-a72b-f8e759a22439" xlink:to="loc_wab_A125PercentSeniorNotesDueTwoThousandAndTwentySevenMember_c0891645-56d1-47e8-9644-6452c5ab4df2" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_A470PercentSeniorNotesDueTwoThousandAndTwentyEightMember_5c71754b-8a85-499f-9102-cf2bf0a7011a" xlink:href="wab-20241231.xsd#wab_A470PercentSeniorNotesDueTwoThousandAndTwentyEightMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb3a0923-e967-47dd-a72b-f8e759a22439" xlink:to="loc_wab_A470PercentSeniorNotesDueTwoThousandAndTwentyEightMember_5c71754b-8a85-499f-9102-cf2bf0a7011a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_A5.611PercentSeniorNotesDueTwoThousandAndThirtyFourMember_9ceb29ef-bde6-4e56-8474-da33620da7ec" xlink:href="wab-20241231.xsd#wab_A5.611PercentSeniorNotesDueTwoThousandAndThirtyFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb3a0923-e967-47dd-a72b-f8e759a22439" xlink:to="loc_wab_A5.611PercentSeniorNotesDueTwoThousandAndThirtyFourMember_9ceb29ef-bde6-4e56-8474-da33620da7ec" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_A2024NotesPlusMember_f07a1dcf-7968-4bf7-9183-f4934e07c450" xlink:href="wab-20241231.xsd#wab_A2024NotesPlusMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cb3a0923-e967-47dd-a72b-f8e759a22439" xlink:to="loc_wab_A2024NotesPlusMember_f07a1dcf-7968-4bf7-9183-f4934e07c450" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_7706150c-3ac0-4780-a6a3-4737bdea6568" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c385cb17-f12a-49ad-b902-35061b17a8b1" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_7706150c-3ac0-4780-a6a3-4737bdea6568" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_7706150c-3ac0-4780-a6a3-4737bdea6568_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_7706150c-3ac0-4780-a6a3-4737bdea6568" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_7706150c-3ac0-4780-a6a3-4737bdea6568_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5e338192-e9b6-4261-b93e-bbb134d1abad" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_7706150c-3ac0-4780-a6a3-4737bdea6568" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5e338192-e9b6-4261-b93e-bbb134d1abad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_f67667aa-e302-44d7-95c6-4a6d8918ad65" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5e338192-e9b6-4261-b93e-bbb134d1abad" xlink:to="loc_us-gaap_LineOfCreditMember_f67667aa-e302-44d7-95c6-4a6d8918ad65" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_3cc7c98f-394d-4475-b97c-fb15d5acb297" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5e338192-e9b6-4261-b93e-bbb134d1abad" xlink:to="loc_us-gaap_SeniorNotesMember_3cc7c98f-394d-4475-b97c-fb15d5acb297" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_A2024CreditAgreementMember_ab9b401c-b56d-4e7f-8ac3-d37f47ce84f1" xlink:href="wab-20241231.xsd#wab_A2024CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5e338192-e9b6-4261-b93e-bbb134d1abad" xlink:to="loc_wab_A2024CreditAgreementMember_ab9b401c-b56d-4e7f-8ac3-d37f47ce84f1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_8803c59e-459e-4ee7-a6c1-af3d074286c2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_8803c59e-459e-4ee7-a6c1-af3d074286c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_5f5af880-030a-4298-b4c1-f48824cc2909" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_5f5af880-030a-4298-b4c1-f48824cc2909" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_1f5a2fd8-b726-497b-963e-7007e744a018" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_1f5a2fd8-b726-497b-963e-7007e744a018" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_a6875263-07c1-46af-8c4a-cffbc5e8215d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_a6875263-07c1-46af-8c4a-cffbc5e8215d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentVariableInterestRateTypeExtensibleEnumeration_81644637-7c98-4be0-ba50-0541f81e9796" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentVariableInterestRateTypeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_us-gaap_DebtInstrumentVariableInterestRateTypeExtensibleEnumeration_81644637-7c98-4be0-ba50-0541f81e9796" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_DebtInstrumentCovenantInterestCoverageRatioMinimum_e3bd12da-c6d9-4fd3-be0e-334c89426a2e" xlink:href="wab-20241231.xsd#wab_DebtInstrumentCovenantInterestCoverageRatioMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_wab_DebtInstrumentCovenantInterestCoverageRatioMinimum_e3bd12da-c6d9-4fd3-be0e-334c89426a2e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_DebtInstrumentCovenantLeverageRatioMaximum_ac65273a-95e5-4a92-b286-172ea42b17bc" xlink:href="wab-20241231.xsd#wab_DebtInstrumentCovenantLeverageRatioMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_wab_DebtInstrumentCovenantLeverageRatioMaximum_ac65273a-95e5-4a92-b286-172ea42b17bc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_DebtInstrumentCovenantLeverageRatioCalculationRestrictedCashAmount_56cf6f28-1418-4a56-a085-5ea5e7fa6a3a" xlink:href="wab-20241231.xsd#wab_DebtInstrumentCovenantLeverageRatioCalculationRestrictedCashAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_wab_DebtInstrumentCovenantLeverageRatioCalculationRestrictedCashAmount_56cf6f28-1418-4a56-a085-5ea5e7fa6a3a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_fda8b3c3-67ff-4b18-8eef-45d664f65189" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_fda8b3c3-67ff-4b18-8eef-45d664f65189" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_19241fb3-c990-4aa2-94a5-5548f702a519" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_19241fb3-c990-4aa2-94a5-5548f702a519" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_a95a3052-7193-4bca-9704-32c9d0f048f7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_a95a3052-7193-4bca-9704-32c9d0f048f7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtWeightedAverageInterestRate_5c5cd19a-d499-457e-b5c9-f7fb4a11d1a0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_us-gaap_LongtermDebtWeightedAverageInterestRate_5c5cd19a-d499-457e-b5c9-f7fb4a11d1a0" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_1d5d8607-32ce-4a17-a90a-edc2f59fb3bb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_1d5d8607-32ce-4a17-a90a-edc2f59fb3bb" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_5dd7a440-cd90-46b7-8b4b-f29c80c88dfd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredFinanceCostsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_5dd7a440-cd90-46b7-8b4b-f29c80c88dfd" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_DebtInstrumentInterestRateStatedPercentagePeriodIncreaseDecrease_5c6a72b6-8143-4f22-b8a8-105001cf2dcc" xlink:href="wab-20241231.xsd#wab_DebtInstrumentInterestRateStatedPercentagePeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_wab_DebtInstrumentInterestRateStatedPercentagePeriodIncreaseDecrease_5c6a72b6-8143-4f22-b8a8-105001cf2dcc" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebt_f907978e-31e9-44b4-a6e5-5175ddaa221f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RepaymentsOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_us-gaap_RepaymentsOfDebt_f907978e-31e9-44b4-a6e5-5175ddaa221f" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_0b95a95f-e324-48aa-a731-ede8b564f9aa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7deabf84-3d82-4269-9be4-2e84575bc1b2" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_0b95a95f-e324-48aa-a731-ede8b564f9aa" xlink:type="arc" order="16"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/LONGTERMDEBTScheduleofLineofCreditFacilitiesDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#LONGTERMDEBTScheduleofLineofCreditFacilitiesDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/LONGTERMDEBTScheduleofLineofCreditFacilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_081e1ab6-a488-4ed4-860f-8c59f62aa1c3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_8189334e-fe4b-4d23-91c3-1fb67aae93c2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_081e1ab6-a488-4ed4-860f-8c59f62aa1c3" xlink:to="loc_us-gaap_DebtInstrumentTable_8189334e-fe4b-4d23-91c3-1fb67aae93c2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_ed58cc8d-9b69-4fe8-988b-5ee74d76c24c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_8189334e-fe4b-4d23-91c3-1fb67aae93c2" xlink:to="loc_us-gaap_CreditFacilityAxis_ed58cc8d-9b69-4fe8-988b-5ee74d76c24c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_ed58cc8d-9b69-4fe8-988b-5ee74d76c24c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_ed58cc8d-9b69-4fe8-988b-5ee74d76c24c" xlink:to="loc_us-gaap_CreditFacilityDomain_ed58cc8d-9b69-4fe8-988b-5ee74d76c24c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_ea12f028-d736-401f-96dd-4f1530316655" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_ed58cc8d-9b69-4fe8-988b-5ee74d76c24c" xlink:to="loc_us-gaap_CreditFacilityDomain_ea12f028-d736-401f-96dd-4f1530316655" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_297d7849-2fda-4604-80df-3dc8e8db6165" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ea12f028-d736-401f-96dd-4f1530316655" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_297d7849-2fda-4604-80df-3dc8e8db6165" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_b46dd099-3d8a-4b10-880e-ebddb88bc503" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ea12f028-d736-401f-96dd-4f1530316655" xlink:to="loc_us-gaap_SecuredDebtMember_b46dd099-3d8a-4b10-880e-ebddb88bc503" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_add0ef42-f37d-4693-9b3d-660240355639" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_8189334e-fe4b-4d23-91c3-1fb67aae93c2" xlink:to="loc_us-gaap_DebtInstrumentAxis_add0ef42-f37d-4693-9b3d-660240355639" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_add0ef42-f37d-4693-9b3d-660240355639_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_add0ef42-f37d-4693-9b3d-660240355639" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_add0ef42-f37d-4693-9b3d-660240355639_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_5ba292f7-81de-4743-8595-7f09d9f0740e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_add0ef42-f37d-4693-9b3d-660240355639" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_5ba292f7-81de-4743-8595-7f09d9f0740e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_TwoThousandandEighteenRefinancingAgreementMember_ae24656d-4502-4963-9167-7c58ba820475" xlink:href="wab-20241231.xsd#wab_TwoThousandandEighteenRefinancingAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_5ba292f7-81de-4743-8595-7f09d9f0740e" xlink:to="loc_wab_TwoThousandandEighteenRefinancingAgreementMember_ae24656d-4502-4963-9167-7c58ba820475" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_RestatedCreditAgreementMember_c1daa1b2-64e4-41c3-a92c-3fd7e9e2dc72" xlink:href="wab-20241231.xsd#wab_RestatedCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_5ba292f7-81de-4743-8595-7f09d9f0740e" xlink:to="loc_wab_RestatedCreditAgreementMember_c1daa1b2-64e4-41c3-a92c-3fd7e9e2dc72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_4ff8f8a4-ce59-457b-a78d-c63b203cea9b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_8189334e-fe4b-4d23-91c3-1fb67aae93c2" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_4ff8f8a4-ce59-457b-a78d-c63b203cea9b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_4ff8f8a4-ce59-457b-a78d-c63b203cea9b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4ff8f8a4-ce59-457b-a78d-c63b203cea9b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_4ff8f8a4-ce59-457b-a78d-c63b203cea9b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_8fbd5d93-2fb4-424a-8cf7-436d2281c238" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4ff8f8a4-ce59-457b-a78d-c63b203cea9b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_8fbd5d93-2fb4-424a-8cf7-436d2281c238" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_3492c165-3195-4ab7-8d0c-9aedab050e7f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_8fbd5d93-2fb4-424a-8cf7-436d2281c238" xlink:to="loc_us-gaap_LineOfCreditMember_3492c165-3195-4ab7-8d0c-9aedab050e7f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_c9ca5576-b917-4f68-89b5-6e2cb44c8171" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_081e1ab6-a488-4ed4-860f-8c59f62aa1c3" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_c9ca5576-b917-4f68-89b5-6e2cb44c8171" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_2495aad9-4e69-4124-820e-fc881f5a580c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_081e1ab6-a488-4ed4-860f-8c59f62aa1c3" xlink:to="loc_us-gaap_LineOfCredit_2495aad9-4e69-4124-820e-fc881f5a580c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_6e6733bc-b11d-4846-a594-dd80496c9507" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_081e1ab6-a488-4ed4-860f-8c59f62aa1c3" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_6e6733bc-b11d-4846-a594-dd80496c9507" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_2341be6b-f0f9-44cd-af41-49f6150e74f8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_081e1ab6-a488-4ed4-860f-8c59f62aa1c3" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_2341be6b-f0f9-44cd-af41-49f6150e74f8" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/EMPLOYEEBENEFITPLANSSummaryofObligationsandFundedStatusDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#EMPLOYEEBENEFITPLANSSummaryofObligationsandFundedStatusDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/EMPLOYEEBENEFITPLANSSummaryofObligationsandFundedStatusDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_300f2049-da2d-4923-bf65-0c7400967b64" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_4c515aa1-b05a-48a2-8b89-0d161e42b8ed" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_300f2049-da2d-4923-bf65-0c7400967b64" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_4c515aa1-b05a-48a2-8b89-0d161e42b8ed" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_475da43b-2382-473f-94b5-a99f89501be2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_4c515aa1-b05a-48a2-8b89-0d161e42b8ed" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_475da43b-2382-473f-94b5-a99f89501be2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_475da43b-2382-473f-94b5-a99f89501be2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_475da43b-2382-473f-94b5-a99f89501be2" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_475da43b-2382-473f-94b5-a99f89501be2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_53a134da-c1e8-4974-9a32-c7c32bdf5f81" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_475da43b-2382-473f-94b5-a99f89501be2" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_53a134da-c1e8-4974-9a32-c7c32bdf5f81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_dceee76d-26e1-4dd4-9931-f639e5bf5157" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DomesticPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_53a134da-c1e8-4974-9a32-c7c32bdf5f81" xlink:to="loc_us-gaap_DomesticPlanMember_dceee76d-26e1-4dd4-9931-f639e5bf5157" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_e009caa2-2654-4b2b-9eb6-2115d1092d53" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_dceee76d-26e1-4dd4-9931-f639e5bf5157" xlink:to="loc_country_US_e009caa2-2654-4b2b-9eb6-2115d1092d53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_5ae6f61b-100d-4899-bc29-95d5a4ae7608" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_53a134da-c1e8-4974-9a32-c7c32bdf5f81" xlink:to="loc_us-gaap_ForeignPlanMember_5ae6f61b-100d-4899-bc29-95d5a4ae7608" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_8ada7ad3-9688-482c-8971-f3fba39f2f01" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_4c515aa1-b05a-48a2-8b89-0d161e42b8ed" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_8ada7ad3-9688-482c-8971-f3fba39f2f01" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_8ada7ad3-9688-482c-8971-f3fba39f2f01_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_8ada7ad3-9688-482c-8971-f3fba39f2f01" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_8ada7ad3-9688-482c-8971-f3fba39f2f01_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_e216bd49-dd3e-4717-b923-4080ffc63444" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_8ada7ad3-9688-482c-8971-f3fba39f2f01" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_e216bd49-dd3e-4717-b923-4080ffc63444" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_1b4b21de-83b9-4384-96c6-b177bce1446f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_e216bd49-dd3e-4717-b923-4080ffc63444" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_1b4b21de-83b9-4384-96c6-b177bce1446f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_8367f7fc-bbf5-43cf-8f45-c2e65477b67e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_300f2049-da2d-4923-bf65-0c7400967b64" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_8367f7fc-bbf5-43cf-8f45-c2e65477b67e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_5d111201-46af-428c-b308-d1c260322a5d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_8367f7fc-bbf5-43cf-8f45-c2e65477b67e" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_5d111201-46af-428c-b308-d1c260322a5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_411386e1-669b-4c70-b416-3c26203b2834" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_8367f7fc-bbf5-43cf-8f45-c2e65477b67e" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_411386e1-669b-4c70-b416-3c26203b2834" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_bf81fa47-8ca4-4a7e-bd66-5f123e657aa0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_8367f7fc-bbf5-43cf-8f45-c2e65477b67e" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_bf81fa47-8ca4-4a7e-bd66-5f123e657aa0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant_fa0bae18-ca2c-47e0-9d51-df6c5b554409" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_8367f7fc-bbf5-43cf-8f45-c2e65477b67e" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant_fa0bae18-ca2c-47e0-9d51-df6c5b554409" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_DefinedBenefitPlanCurtailmentsAndAmendments_ddc155c1-d1df-4163-8643-1f818dd93378" xlink:href="wab-20241231.xsd#wab_DefinedBenefitPlanCurtailmentsAndAmendments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_8367f7fc-bbf5-43cf-8f45-c2e65477b67e" xlink:to="loc_wab_DefinedBenefitPlanCurtailmentsAndAmendments_ddc155c1-d1df-4163-8643-1f818dd93378" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_d036c17b-b0be-4c40-abae-7066135f2c9d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_8367f7fc-bbf5-43cf-8f45-c2e65477b67e" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_d036c17b-b0be-4c40-abae-7066135f2c9d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation_fe2a96b9-946e-496c-a261-5c976e1fe76e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_8367f7fc-bbf5-43cf-8f45-c2e65477b67e" xlink:to="loc_us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation_fe2a96b9-946e-496c-a261-5c976e1fe76e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_9d255b49-cf5c-4874-97d0-3ed6d37b6a0f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanActuarialGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_8367f7fc-bbf5-43cf-8f45-c2e65477b67e" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_9d255b49-cf5c-4874-97d0-3ed6d37b6a0f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation_7ef52709-3b53-452e-a443-4da3f570d510" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_8367f7fc-bbf5-43cf-8f45-c2e65477b67e" xlink:to="loc_us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation_7ef52709-3b53-452e-a443-4da3f570d510" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_eb66d71c-28db-4b67-bd79-1178410286e4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_b4b0dbb5-0eb9-436f-b485-9c18fc6f9668" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_300f2049-da2d-4923-bf65-0c7400967b64" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_b4b0dbb5-0eb9-436f-b485-9c18fc6f9668" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_dff67a89-94dd-44e4-8d30-92609a97427b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_b4b0dbb5-0eb9-436f-b485-9c18fc6f9668" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_dff67a89-94dd-44e4-8d30-92609a97427b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_1b6f9378-bb40-4d58-bcb2-9a7af14da91c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_b4b0dbb5-0eb9-436f-b485-9c18fc6f9668" xlink:to="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_1b6f9378-bb40-4d58-bcb2-9a7af14da91c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_0a0abe7a-b7b3-4dfd-8ca8-2b7781f6553a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_b4b0dbb5-0eb9-436f-b485-9c18fc6f9668" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_0a0abe7a-b7b3-4dfd-8ca8-2b7781f6553a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant_39b63b5d-facd-458f-a1b7-1dc5eac4e15a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_b4b0dbb5-0eb9-436f-b485-9c18fc6f9668" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant_39b63b5d-facd-458f-a1b7-1dc5eac4e15a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_ee1011c0-f5f8-48d3-9741-3521fc61f392" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_b4b0dbb5-0eb9-436f-b485-9c18fc6f9668" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_ee1011c0-f5f8-48d3-9741-3521fc61f392" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_DefinedBenefitPlanPlanAssetsPaymentForSettlementAndOther_8d5a1203-2fb3-4ee7-934a-626eb2ebc39b" xlink:href="wab-20241231.xsd#wab_DefinedBenefitPlanPlanAssetsPaymentForSettlementAndOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_b4b0dbb5-0eb9-436f-b485-9c18fc6f9668" xlink:to="loc_wab_DefinedBenefitPlanPlanAssetsPaymentForSettlementAndOther_8d5a1203-2fb3-4ee7-934a-626eb2ebc39b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets_7bfddcc6-ef9b-40cd-b7c9-c02e2daf9fb5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_b4b0dbb5-0eb9-436f-b485-9c18fc6f9668" xlink:to="loc_us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets_7bfddcc6-ef9b-40cd-b7c9-c02e2daf9fb5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_e398f941-3b39-4ec7-aba9-863a85a5a2d9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_b4b0dbb5-0eb9-436f-b485-9c18fc6f9668" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_e398f941-3b39-4ec7-aba9-863a85a5a2d9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_6f0afc91-5a24-4617-8eb9-8344c42601db" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_a5581afb-83f4-4a0b-9fba-f5536d2697b6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_5d84777b-4ffa-41fd-9126-f651fd6defba" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_632d6b60-ef8b-4191-b259-70515bc96898" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_300f2049-da2d-4923-bf65-0c7400967b64" xlink:to="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_632d6b60-ef8b-4191-b259-70515bc96898" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_6135f6d0-7171-42bf-b237-0a05db252e2d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_300f2049-da2d-4923-bf65-0c7400967b64" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_6135f6d0-7171-42bf-b237-0a05db252e2d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_d20a5ab3-01d7-4b4d-abd7-bcbc2061fb31" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_6135f6d0-7171-42bf-b237-0a05db252e2d" xlink:to="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_d20a5ab3-01d7-4b4d-abd7-bcbc2061fb31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_4f32e43e-df62-4bc1-8205-1d9bd5cff2dc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_6135f6d0-7171-42bf-b237-0a05db252e2d" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_4f32e43e-df62-4bc1-8205-1d9bd5cff2dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_209f45c2-e61c-4fdf-84f9-92fb5d2414df" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_6135f6d0-7171-42bf-b237-0a05db252e2d" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_209f45c2-e61c-4fdf-84f9-92fb5d2414df" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_b7df8be4-cdf1-4eb7-a032-7c0e47e5500a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_6135f6d0-7171-42bf-b237-0a05db252e2d" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_b7df8be4-cdf1-4eb7-a032-7c0e47e5500a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeAbstract_2bc4e90f-84c4-4c76-9578-af3c0468749b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_300f2049-da2d-4923-bf65-0c7400967b64" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeAbstract_2bc4e90f-84c4-4c76-9578-af3c0468749b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_5b982b06-de4b-49be-bc51-95d6caf31020" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeAbstract_2bc4e90f-84c4-4c76-9578-af3c0468749b" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_5b982b06-de4b-49be-bc51-95d6caf31020" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_24638545-ef14-46eb-95c5-3ad7a41974c5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeAbstract_2bc4e90f-84c4-4c76-9578-af3c0468749b" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_24638545-ef14-46eb-95c5-3ad7a41974c5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_eabe8a75-8d9e-4659-8c24-6e0c2d8efa5b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeAbstract_2bc4e90f-84c4-4c76-9578-af3c0468749b" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_eabe8a75-8d9e-4659-8c24-6e0c2d8efa5b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/EMPLOYEEBENEFITPLANSNarrativeDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#EMPLOYEEBENEFITPLANSNarrativeDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/EMPLOYEEBENEFITPLANSNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_04b039ef-ff25-4e85-832b-80a937bb159a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_6a3b3e28-bcb8-43ab-a106-5a9a4af929ca" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_04b039ef-ff25-4e85-832b-80a937bb159a" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_6a3b3e28-bcb8-43ab-a106-5a9a4af929ca" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_40bec056-38a9-4311-9acd-ec54d2d251d2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_6a3b3e28-bcb8-43ab-a106-5a9a4af929ca" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_40bec056-38a9-4311-9acd-ec54d2d251d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_40bec056-38a9-4311-9acd-ec54d2d251d2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_40bec056-38a9-4311-9acd-ec54d2d251d2" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_40bec056-38a9-4311-9acd-ec54d2d251d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_ef498656-130f-4e8d-944a-d2e2ab65139c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_40bec056-38a9-4311-9acd-ec54d2d251d2" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_ef498656-130f-4e8d-944a-d2e2ab65139c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_5716fea8-ae9e-4029-876b-40a4cebee601" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DomesticPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_ef498656-130f-4e8d-944a-d2e2ab65139c" xlink:to="loc_us-gaap_DomesticPlanMember_5716fea8-ae9e-4029-876b-40a4cebee601" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_c281bc5d-db29-440c-b906-c45f6013067d" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_5716fea8-ae9e-4029-876b-40a4cebee601" xlink:to="loc_country_US_c281bc5d-db29-440c-b906-c45f6013067d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_8a2e297b-1ec6-490c-844f-dee9f7ed114c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_ef498656-130f-4e8d-944a-d2e2ab65139c" xlink:to="loc_us-gaap_ForeignPlanMember_8a2e297b-1ec6-490c-844f-dee9f7ed114c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_1ddb1983-75e8-434c-bf19-3bc874a7fb93" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_6a3b3e28-bcb8-43ab-a106-5a9a4af929ca" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_1ddb1983-75e8-434c-bf19-3bc874a7fb93" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_1ddb1983-75e8-434c-bf19-3bc874a7fb93_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_1ddb1983-75e8-434c-bf19-3bc874a7fb93" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_1ddb1983-75e8-434c-bf19-3bc874a7fb93_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_d7a8f705-d96c-4b74-9edb-ff29d8b72734" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_1ddb1983-75e8-434c-bf19-3bc874a7fb93" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_d7a8f705-d96c-4b74-9edb-ff29d8b72734" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_799c88d1-7027-47b3-972b-8f48f80905b4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_d7a8f705-d96c-4b74-9edb-ff29d8b72734" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_799c88d1-7027-47b3-972b-8f48f80905b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_ede829e8-2b39-4e20-afa8-ae34e1551344" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_6a3b3e28-bcb8-43ab-a106-5a9a4af929ca" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_ede829e8-2b39-4e20-afa8-ae34e1551344" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_ede829e8-2b39-4e20-afa8-ae34e1551344_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_ede829e8-2b39-4e20-afa8-ae34e1551344" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_ede829e8-2b39-4e20-afa8-ae34e1551344_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_06974b5f-4e51-4708-a407-3d0ddb7969e0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_ede829e8-2b39-4e20-afa8-ae34e1551344" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_06974b5f-4e51-4708-a407-3d0ddb7969e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_b229ec71-8ba3-4657-9d6e-666751107c6d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_06974b5f-4e51-4708-a407-3d0ddb7969e0" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_b229ec71-8ba3-4657-9d6e-666751107c6d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDebtSecurityMember_2f61987c-b27a-47d6-85e6-e12eaca4ccf6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanDebtSecurityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_06974b5f-4e51-4708-a407-3d0ddb7969e0" xlink:to="loc_us-gaap_DefinedBenefitPlanDebtSecurityMember_2f61987c-b27a-47d6-85e6-e12eaca4ccf6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestmentsMember_c2787738-934d-4cd2-9967-b747d10c6d40" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_06974b5f-4e51-4708-a407-3d0ddb7969e0" xlink:to="loc_us-gaap_OtherInvestmentsMember_c2787738-934d-4cd2-9967-b747d10c6d40" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_8c9d3b43-660d-4382-929b-1f28d55122a5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_04b039ef-ff25-4e85-832b-80a937bb159a" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_8c9d3b43-660d-4382-929b-1f28d55122a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_8ab7b977-50b2-480c-95e0-b73b09eaaa5a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_04b039ef-ff25-4e85-832b-80a937bb159a" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_8ab7b977-50b2-480c-95e0-b73b09eaaa5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanCostRecognized_45846f27-0bee-4c96-b460-fe852b0acfd9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedContributionPlanCostRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_04b039ef-ff25-4e85-832b-80a937bb159a" xlink:to="loc_us-gaap_DefinedContributionPlanCostRecognized_45846f27-0bee-4c96-b460-fe852b0acfd9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_DefinedContributionPlanNumberOfSharesHeldOnBehalfOfParticipants_7d7c43a7-d737-4531-9318-c3b751e37856" xlink:href="wab-20241231.xsd#wab_DefinedContributionPlanNumberOfSharesHeldOnBehalfOfParticipants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_04b039ef-ff25-4e85-832b-80a937bb159a" xlink:to="loc_wab_DefinedContributionPlanNumberOfSharesHeldOnBehalfOfParticipants_7d7c43a7-d737-4531-9318-c3b751e37856" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_DefinedContributionPlanMarketValueOfSharesHeldOnBehalfOfParticipants_0a3c2d03-8615-4afd-9750-9e8f8fd22563" xlink:href="wab-20241231.xsd#wab_DefinedContributionPlanMarketValueOfSharesHeldOnBehalfOfParticipants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_04b039ef-ff25-4e85-832b-80a937bb159a" xlink:to="loc_wab_DefinedContributionPlanMarketValueOfSharesHeldOnBehalfOfParticipants_0a3c2d03-8615-4afd-9750-9e8f8fd22563" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/EMPLOYEEBENEFITPLANSSummaryofInternationalPensionPlanswithAccumulatedBenefitObligationsandwithProjectedBenefitObligationsinExcessofPlanAssetsDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#EMPLOYEEBENEFITPLANSSummaryofInternationalPensionPlanswithAccumulatedBenefitObligationsandwithProjectedBenefitObligationsinExcessofPlanAssetsDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/EMPLOYEEBENEFITPLANSSummaryofInternationalPensionPlanswithAccumulatedBenefitObligationsandwithProjectedBenefitObligationsinExcessofPlanAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_d3441d8e-5967-4eed-89b6-b216b7c50d83" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_03e4f64b-89a5-42fa-b276-472c7572e99f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_d3441d8e-5967-4eed-89b6-b216b7c50d83" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_03e4f64b-89a5-42fa-b276-472c7572e99f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_f0c3cb63-fd7b-43c6-82a0-253e542c78fb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_03e4f64b-89a5-42fa-b276-472c7572e99f" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_f0c3cb63-fd7b-43c6-82a0-253e542c78fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_f0c3cb63-fd7b-43c6-82a0-253e542c78fb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_f0c3cb63-fd7b-43c6-82a0-253e542c78fb" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_f0c3cb63-fd7b-43c6-82a0-253e542c78fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_6161a4cd-b004-4554-9831-145c2e67f55b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_f0c3cb63-fd7b-43c6-82a0-253e542c78fb" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_6161a4cd-b004-4554-9831-145c2e67f55b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_4a64b9f3-51b6-488d-be3b-715dfed7698f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_6161a4cd-b004-4554-9831-145c2e67f55b" xlink:to="loc_us-gaap_ForeignPlanMember_4a64b9f3-51b6-488d-be3b-715dfed7698f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_49c826fb-3f94-49fc-adad-eab8dd01e283" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_03e4f64b-89a5-42fa-b276-472c7572e99f" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_49c826fb-3f94-49fc-adad-eab8dd01e283" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_49c826fb-3f94-49fc-adad-eab8dd01e283_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_49c826fb-3f94-49fc-adad-eab8dd01e283" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_49c826fb-3f94-49fc-adad-eab8dd01e283_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_3901110f-7145-4433-b366-ede988ec118d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_49c826fb-3f94-49fc-adad-eab8dd01e283" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_3901110f-7145-4433-b366-ede988ec118d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_f5845679-08db-491a-81f7-6880d3e87942" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_3901110f-7145-4433-b366-ede988ec118d" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_f5845679-08db-491a-81f7-6880d3e87942" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract_896975d3-94db-4ff7-83d3-30ebdec5736e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_d3441d8e-5967-4eed-89b6-b216b7c50d83" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract_896975d3-94db-4ff7-83d3-30ebdec5736e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation_d946264d-54ff-4c02-9e04-f4644ce1bfc7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract_896975d3-94db-4ff7-83d3-30ebdec5736e" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation_d946264d-54ff-4c02-9e04-f4644ce1bfc7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_756e5b2f-7429-430f-9dd5-ca23b7a0226b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract_896975d3-94db-4ff7-83d3-30ebdec5736e" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_756e5b2f-7429-430f-9dd5-ca23b7a0226b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_fce0fed5-83fe-4f32-80b6-e2c1bb9e4389" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract_896975d3-94db-4ff7-83d3-30ebdec5736e" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_fce0fed5-83fe-4f32-80b6-e2c1bb9e4389" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAbstract_aee6ebfe-2324-40d4-a922-4fec6127921a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_d3441d8e-5967-4eed-89b6-b216b7c50d83" xlink:to="loc_us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAbstract_aee6ebfe-2324-40d4-a922-4fec6127921a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_60f8765b-6c3f-4b57-9a52-6f63b7e198e8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAbstract_aee6ebfe-2324-40d4-a922-4fec6127921a" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_60f8765b-6c3f-4b57-9a52-6f63b7e198e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsAccumulatedBenefitObligation_4ce57815-baca-4820-b0d9-c6dc3612377f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsAccumulatedBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAbstract_aee6ebfe-2324-40d4-a922-4fec6127921a" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsAccumulatedBenefitObligation_4ce57815-baca-4820-b0d9-c6dc3612377f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_106b74b8-6fad-4e40-96e7-9560506c1e6b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAbstract_aee6ebfe-2324-40d4-a922-4fec6127921a" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_106b74b8-6fad-4e40-96e7-9560506c1e6b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/EMPLOYEEBENEFITPLANSSummaryofComponentsofNetPeriodicBenefitCostsDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#EMPLOYEEBENEFITPLANSSummaryofComponentsofNetPeriodicBenefitCostsDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/EMPLOYEEBENEFITPLANSSummaryofComponentsofNetPeriodicBenefitCostsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0705f155-917a-4baf-8f4a-a2f8f2bbee61" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_b21406fe-27e0-4a45-bf74-7d8b159bff6c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0705f155-917a-4baf-8f4a-a2f8f2bbee61" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_b21406fe-27e0-4a45-bf74-7d8b159bff6c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_31e24260-ef96-4c7e-bf7e-7ac4ac507a9d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_b21406fe-27e0-4a45-bf74-7d8b159bff6c" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_31e24260-ef96-4c7e-bf7e-7ac4ac507a9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_31e24260-ef96-4c7e-bf7e-7ac4ac507a9d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_31e24260-ef96-4c7e-bf7e-7ac4ac507a9d" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_31e24260-ef96-4c7e-bf7e-7ac4ac507a9d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_06d17160-9453-4c78-9e47-a2f3b4112ae1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_31e24260-ef96-4c7e-bf7e-7ac4ac507a9d" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_06d17160-9453-4c78-9e47-a2f3b4112ae1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_18b89de8-eb9f-4e0b-b3da-4ef90d18c825" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DomesticPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_06d17160-9453-4c78-9e47-a2f3b4112ae1" xlink:to="loc_us-gaap_DomesticPlanMember_18b89de8-eb9f-4e0b-b3da-4ef90d18c825" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_d6f3ff5d-8075-4139-b8b6-5baeb0aa068a" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_18b89de8-eb9f-4e0b-b3da-4ef90d18c825" xlink:to="loc_country_US_d6f3ff5d-8075-4139-b8b6-5baeb0aa068a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_85970921-d1ae-4234-b194-351aa9ae4c2e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_06d17160-9453-4c78-9e47-a2f3b4112ae1" xlink:to="loc_us-gaap_ForeignPlanMember_85970921-d1ae-4234-b194-351aa9ae4c2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_f4ff32fd-c753-47c7-8654-9a0b96eebaa9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_b21406fe-27e0-4a45-bf74-7d8b159bff6c" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_f4ff32fd-c753-47c7-8654-9a0b96eebaa9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_f4ff32fd-c753-47c7-8654-9a0b96eebaa9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_f4ff32fd-c753-47c7-8654-9a0b96eebaa9" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_f4ff32fd-c753-47c7-8654-9a0b96eebaa9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_6b7f40af-aa09-482a-90ff-e76ecdc517c9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_f4ff32fd-c753-47c7-8654-9a0b96eebaa9" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_6b7f40af-aa09-482a-90ff-e76ecdc517c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_dd439bf3-f6b4-4ca5-a788-529f9a0ffd26" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_6b7f40af-aa09-482a-90ff-e76ecdc517c9" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_dd439bf3-f6b4-4ca5-a788-529f9a0ffd26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_0d33cbe9-1a80-4403-8296-c995ef4f78b9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0705f155-917a-4baf-8f4a-a2f8f2bbee61" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_0d33cbe9-1a80-4403-8296-c995ef4f78b9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_4f364319-b500-47ec-9a00-3795e90ee5fc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0705f155-917a-4baf-8f4a-a2f8f2bbee61" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_4f364319-b500-47ec-9a00-3795e90ee5fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_d26a0f3f-fdb5-468a-b6f1-71ade7ad0436" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0705f155-917a-4baf-8f4a-a2f8f2bbee61" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_d26a0f3f-fdb5-468a-b6f1-71ade7ad0436" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_c6acadd1-dc24-4563-a54b-3dc4f15a62e5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0705f155-917a-4baf-8f4a-a2f8f2bbee61" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_c6acadd1-dc24-4563-a54b-3dc4f15a62e5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1_465833b5-0a3c-4794-a2fe-1d845c6a02bb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0705f155-917a-4baf-8f4a-a2f8f2bbee61" xlink:to="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1_465833b5-0a3c-4794-a2fe-1d845c6a02bb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_a4a66bfb-f14c-4bb2-9c3c-fac28e05a0e3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0705f155-917a-4baf-8f4a-a2f8f2bbee61" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_a4a66bfb-f14c-4bb2-9c3c-fac28e05a0e3" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/EMPLOYEEBENEFITPLANSSummaryofWeightedAverageAssumptionsUsedtoDevelopActuarialPresentValueofProjectedBenefitObligationDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#EMPLOYEEBENEFITPLANSSummaryofWeightedAverageAssumptionsUsedtoDevelopActuarialPresentValueofProjectedBenefitObligationDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/EMPLOYEEBENEFITPLANSSummaryofWeightedAverageAssumptionsUsedtoDevelopActuarialPresentValueofProjectedBenefitObligationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_69fc5484-56c5-419f-b1a2-9329d020669e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_c5780f52-cbb1-4738-b5ad-9c2ea8a6e258" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_69fc5484-56c5-419f-b1a2-9329d020669e" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_c5780f52-cbb1-4738-b5ad-9c2ea8a6e258" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_142f54f4-e7f5-4dd8-b75c-328da6d37b2a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_c5780f52-cbb1-4738-b5ad-9c2ea8a6e258" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_142f54f4-e7f5-4dd8-b75c-328da6d37b2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_142f54f4-e7f5-4dd8-b75c-328da6d37b2a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_142f54f4-e7f5-4dd8-b75c-328da6d37b2a" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_142f54f4-e7f5-4dd8-b75c-328da6d37b2a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_eff47e88-4a75-480e-b3d7-04b1881cc098" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_142f54f4-e7f5-4dd8-b75c-328da6d37b2a" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_eff47e88-4a75-480e-b3d7-04b1881cc098" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_b19171ce-2c1a-4077-af9c-ce522a199fa5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DomesticPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_eff47e88-4a75-480e-b3d7-04b1881cc098" xlink:to="loc_us-gaap_DomesticPlanMember_b19171ce-2c1a-4077-af9c-ce522a199fa5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_f0cfbbb2-e288-4a7d-ad30-ac40109fec64" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_b19171ce-2c1a-4077-af9c-ce522a199fa5" xlink:to="loc_country_US_f0cfbbb2-e288-4a7d-ad30-ac40109fec64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_76a66e2e-c140-4810-870a-83bf0f233396" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_eff47e88-4a75-480e-b3d7-04b1881cc098" xlink:to="loc_us-gaap_ForeignPlanMember_76a66e2e-c140-4810-870a-83bf0f233396" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_e0bfc693-0107-42f8-9bff-3e06b46ad26d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_c5780f52-cbb1-4738-b5ad-9c2ea8a6e258" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_e0bfc693-0107-42f8-9bff-3e06b46ad26d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_e0bfc693-0107-42f8-9bff-3e06b46ad26d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_e0bfc693-0107-42f8-9bff-3e06b46ad26d" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_e0bfc693-0107-42f8-9bff-3e06b46ad26d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_3ba1f92e-3a9d-4e4e-991d-cf1563d335b5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_e0bfc693-0107-42f8-9bff-3e06b46ad26d" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_3ba1f92e-3a9d-4e4e-991d-cf1563d335b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_d65c982d-eb8d-48c4-b605-485733266402" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_3ba1f92e-3a9d-4e4e-991d-cf1563d335b5" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_d65c982d-eb8d-48c4-b605-485733266402" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_baa68be1-d12c-4023-ba11-989313f98cce" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_69fc5484-56c5-419f-b1a2-9329d020669e" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_baa68be1-d12c-4023-ba11-989313f98cce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_634413ca-eee5-4996-a937-683b52a3c8d1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_69fc5484-56c5-419f-b1a2-9329d020669e" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_634413ca-eee5-4996-a937-683b52a3c8d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease_95c5e95f-a163-44a9-82b4-094ff9a6284e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_69fc5484-56c5-419f-b1a2-9329d020669e" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease_95c5e95f-a163-44a9-82b4-094ff9a6284e" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/EMPLOYEEBENEFITPLANSSummaryofPensionPlanAssetsbyAssetCategoryDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#EMPLOYEEBENEFITPLANSSummaryofPensionPlanAssetsbyAssetCategoryDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/EMPLOYEEBENEFITPLANSSummaryofPensionPlanAssetsbyAssetCategoryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_c96bec5e-3a67-4e0e-9ad8-1591c7ea6dbd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_6d999c18-4e16-4589-ba18-99e7ead9c093" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_c96bec5e-3a67-4e0e-9ad8-1591c7ea6dbd" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_6d999c18-4e16-4589-ba18-99e7ead9c093" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_14e7c58e-2e85-412a-96fd-b9035218b390" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_6d999c18-4e16-4589-ba18-99e7ead9c093" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_14e7c58e-2e85-412a-96fd-b9035218b390" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_14e7c58e-2e85-412a-96fd-b9035218b390_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_14e7c58e-2e85-412a-96fd-b9035218b390" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_14e7c58e-2e85-412a-96fd-b9035218b390_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_00789a19-e41a-4649-a95f-ab8ae82f2052" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_14e7c58e-2e85-412a-96fd-b9035218b390" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_00789a19-e41a-4649-a95f-ab8ae82f2052" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_5e42fc42-c618-4903-9fd3-7779ee241135" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DomesticPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_00789a19-e41a-4649-a95f-ab8ae82f2052" xlink:to="loc_us-gaap_DomesticPlanMember_5e42fc42-c618-4903-9fd3-7779ee241135" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_3ec1bab7-0830-4bed-94b6-7219e4742ae7" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_5e42fc42-c618-4903-9fd3-7779ee241135" xlink:to="loc_country_US_3ec1bab7-0830-4bed-94b6-7219e4742ae7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_e85021f2-57d5-4b66-82f8-c21f5289ae2b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_00789a19-e41a-4649-a95f-ab8ae82f2052" xlink:to="loc_us-gaap_ForeignPlanMember_e85021f2-57d5-4b66-82f8-c21f5289ae2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_59ae7c00-6350-437b-914f-3a10d890cf15" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_6d999c18-4e16-4589-ba18-99e7ead9c093" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_59ae7c00-6350-437b-914f-3a10d890cf15" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_59ae7c00-6350-437b-914f-3a10d890cf15_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_59ae7c00-6350-437b-914f-3a10d890cf15" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_59ae7c00-6350-437b-914f-3a10d890cf15_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_cbe6dde9-d36c-4492-9367-ff8972145f46" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_59ae7c00-6350-437b-914f-3a10d890cf15" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_cbe6dde9-d36c-4492-9367-ff8972145f46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_a3922e4f-3bd5-444e-9499-309c0a543248" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_cbe6dde9-d36c-4492-9367-ff8972145f46" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_a3922e4f-3bd5-444e-9499-309c0a543248" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_bc7b1a7a-6b3f-453b-9c0f-2cf3d3f2a9c0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_6d999c18-4e16-4589-ba18-99e7ead9c093" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_bc7b1a7a-6b3f-453b-9c0f-2cf3d3f2a9c0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_bc7b1a7a-6b3f-453b-9c0f-2cf3d3f2a9c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_bc7b1a7a-6b3f-453b-9c0f-2cf3d3f2a9c0" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_bc7b1a7a-6b3f-453b-9c0f-2cf3d3f2a9c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_01f3ab2e-b926-410b-84c7-e195293846eb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_bc7b1a7a-6b3f-453b-9c0f-2cf3d3f2a9c0" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_01f3ab2e-b926-410b-84c7-e195293846eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_1f6b35e6-e1c7-4079-beda-b3fed78a7b9d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_01f3ab2e-b926-410b-84c7-e195293846eb" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_1f6b35e6-e1c7-4079-beda-b3fed78a7b9d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDebtSecurityMember_c6407819-2021-41c2-8c0b-8cb751fe3572" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanDebtSecurityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_01f3ab2e-b926-410b-84c7-e195293846eb" xlink:to="loc_us-gaap_DefinedBenefitPlanDebtSecurityMember_c6407819-2021-41c2-8c0b-8cb751fe3572" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_DefinedBenefitPlanInsuranceContractsMember_1787e005-5b39-43cc-9216-c8b485db95d2" xlink:href="wab-20241231.xsd#wab_DefinedBenefitPlanInsuranceContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_01f3ab2e-b926-410b-84c7-e195293846eb" xlink:to="loc_wab_DefinedBenefitPlanInsuranceContractsMember_1787e005-5b39-43cc-9216-c8b485db95d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_e1f516fd-a26e-4328-8e13-26df7f71fb8e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_01f3ab2e-b926-410b-84c7-e195293846eb" xlink:to="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_e1f516fd-a26e-4328-8e13-26df7f71fb8e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_e50bf84b-fd0f-42e6-8592-66db9f4bc1cc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_c96bec5e-3a67-4e0e-9ad8-1591c7ea6dbd" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_e50bf84b-fd0f-42e6-8592-66db9f4bc1cc" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/EMPLOYEEBENEFITPLANSSummaryofPensionPlanAssetsMeasuredatFairValueDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#EMPLOYEEBENEFITPLANSSummaryofPensionPlanAssetsMeasuredatFairValueDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/EMPLOYEEBENEFITPLANSSummaryofPensionPlanAssetsMeasuredatFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_465c6174-33fc-4e90-a2ec-a8b139e55960" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_5f1bb0a5-b102-410e-ad0a-9409e24a0bdd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_465c6174-33fc-4e90-a2ec-a8b139e55960" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_5f1bb0a5-b102-410e-ad0a-9409e24a0bdd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_5f4e0c6a-16f5-4a83-89d4-6b43e179b176" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_5f1bb0a5-b102-410e-ad0a-9409e24a0bdd" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_5f4e0c6a-16f5-4a83-89d4-6b43e179b176" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_5f4e0c6a-16f5-4a83-89d4-6b43e179b176_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_5f4e0c6a-16f5-4a83-89d4-6b43e179b176" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_5f4e0c6a-16f5-4a83-89d4-6b43e179b176_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_4b42388b-06d1-4be8-8846-7fc9107b536a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_5f4e0c6a-16f5-4a83-89d4-6b43e179b176" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_4b42388b-06d1-4be8-8846-7fc9107b536a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_ec8f2505-9804-4a4c-814d-a88eecde7953" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_4b42388b-06d1-4be8-8846-7fc9107b536a" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_ec8f2505-9804-4a4c-814d-a88eecde7953" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDebtSecurityMember_89d9b102-0f40-4aeb-bbd1-06b02b4e6b93" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanDebtSecurityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_4b42388b-06d1-4be8-8846-7fc9107b536a" xlink:to="loc_us-gaap_DefinedBenefitPlanDebtSecurityMember_89d9b102-0f40-4aeb-bbd1-06b02b4e6b93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_e4f2b27f-7790-439c-9a13-2bc185850af3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_4b42388b-06d1-4be8-8846-7fc9107b536a" xlink:to="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_e4f2b27f-7790-439c-9a13-2bc185850af3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_DefinedBenefitPlanInsuranceContractsMember_5f9202a1-d59a-45f7-98a4-d914a92ebadb" xlink:href="wab-20241231.xsd#wab_DefinedBenefitPlanInsuranceContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_4b42388b-06d1-4be8-8846-7fc9107b536a" xlink:to="loc_wab_DefinedBenefitPlanInsuranceContractsMember_5f9202a1-d59a-45f7-98a4-d914a92ebadb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_aa2dbd2c-522c-4c2c-a7d2-f2ffbe81677e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_5f1bb0a5-b102-410e-ad0a-9409e24a0bdd" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_aa2dbd2c-522c-4c2c-a7d2-f2ffbe81677e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_aa2dbd2c-522c-4c2c-a7d2-f2ffbe81677e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_aa2dbd2c-522c-4c2c-a7d2-f2ffbe81677e" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_aa2dbd2c-522c-4c2c-a7d2-f2ffbe81677e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_846bf14c-7be8-4ae2-8f08-3c271518cf74" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_aa2dbd2c-522c-4c2c-a7d2-f2ffbe81677e" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_846bf14c-7be8-4ae2-8f08-3c271518cf74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_cffc9fbe-ed9e-4e79-8ebe-cd6251430f69" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_846bf14c-7be8-4ae2-8f08-3c271518cf74" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_cffc9fbe-ed9e-4e79-8ebe-cd6251430f69" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_998bcc13-b597-47d7-9144-2678b9884825" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_846bf14c-7be8-4ae2-8f08-3c271518cf74" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_998bcc13-b597-47d7-9144-2678b9884825" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_b49f0e17-e3dc-4e11-8fe8-43b1bca57dce" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_846bf14c-7be8-4ae2-8f08-3c271518cf74" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_b49f0e17-e3dc-4e11-8fe8-43b1bca57dce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_71b1b44d-2593-4643-95b6-b0c3ae634783" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_846bf14c-7be8-4ae2-8f08-3c271518cf74" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_71b1b44d-2593-4643-95b6-b0c3ae634783" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_298a5b27-1774-4d76-91b8-c1c6eb4349e8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_5f1bb0a5-b102-410e-ad0a-9409e24a0bdd" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_298a5b27-1774-4d76-91b8-c1c6eb4349e8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_298a5b27-1774-4d76-91b8-c1c6eb4349e8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_298a5b27-1774-4d76-91b8-c1c6eb4349e8" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_298a5b27-1774-4d76-91b8-c1c6eb4349e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_10d943c0-08bf-4903-a7ab-947e4e61d964" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_298a5b27-1774-4d76-91b8-c1c6eb4349e8" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_10d943c0-08bf-4903-a7ab-947e4e61d964" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_3f8424eb-fca0-4925-af7a-7fc97a707bed" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DomesticPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_10d943c0-08bf-4903-a7ab-947e4e61d964" xlink:to="loc_us-gaap_DomesticPlanMember_3f8424eb-fca0-4925-af7a-7fc97a707bed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_acfc08ae-be70-46c7-83ac-555cebc29159" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_3f8424eb-fca0-4925-af7a-7fc97a707bed" xlink:to="loc_country_US_acfc08ae-be70-46c7-83ac-555cebc29159" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_41e1f1bd-5c2c-4f95-88cd-4e1fb0483de5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_10d943c0-08bf-4903-a7ab-947e4e61d964" xlink:to="loc_us-gaap_ForeignPlanMember_41e1f1bd-5c2c-4f95-88cd-4e1fb0483de5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_4152e996-feb1-4e18-8f6c-488a682d47e6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_465c6174-33fc-4e90-a2ec-a8b139e55960" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_4152e996-feb1-4e18-8f6c-488a682d47e6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/EMPLOYEEBENEFITPLANSSummaryofBenefitPaymentsExpectedtobePaidtoPlanParticipantsDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#EMPLOYEEBENEFITPLANSSummaryofBenefitPaymentsExpectedtobePaidtoPlanParticipantsDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/EMPLOYEEBENEFITPLANSSummaryofBenefitPaymentsExpectedtobePaidtoPlanParticipantsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_e64da3bb-7b42-498c-a350-0df96e980b29" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_3d30d3c7-a22c-4bcf-8e58-d43ef6ad6260" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_e64da3bb-7b42-498c-a350-0df96e980b29" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_3d30d3c7-a22c-4bcf-8e58-d43ef6ad6260" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_57691de5-5bd9-4233-9781-eb8e4cbddc5f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_3d30d3c7-a22c-4bcf-8e58-d43ef6ad6260" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_57691de5-5bd9-4233-9781-eb8e4cbddc5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_57691de5-5bd9-4233-9781-eb8e4cbddc5f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_57691de5-5bd9-4233-9781-eb8e4cbddc5f" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_57691de5-5bd9-4233-9781-eb8e4cbddc5f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_deec73f2-9a22-410b-8b33-83318423f5fa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_57691de5-5bd9-4233-9781-eb8e4cbddc5f" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_deec73f2-9a22-410b-8b33-83318423f5fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_70c27cab-c379-4c27-8458-be9e85f6d380" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DomesticPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_deec73f2-9a22-410b-8b33-83318423f5fa" xlink:to="loc_us-gaap_DomesticPlanMember_70c27cab-c379-4c27-8458-be9e85f6d380" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_13fe709c-b172-4400-bd60-375bdde211b5" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_70c27cab-c379-4c27-8458-be9e85f6d380" xlink:to="loc_country_US_13fe709c-b172-4400-bd60-375bdde211b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_5dd4b4e5-27f6-4f17-9081-f74f11de2832" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_deec73f2-9a22-410b-8b33-83318423f5fa" xlink:to="loc_us-gaap_ForeignPlanMember_5dd4b4e5-27f6-4f17-9081-f74f11de2832" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_57ed0ca6-e650-488c-94f1-90f4cdcc9637" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_3d30d3c7-a22c-4bcf-8e58-d43ef6ad6260" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_57ed0ca6-e650-488c-94f1-90f4cdcc9637" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_57ed0ca6-e650-488c-94f1-90f4cdcc9637_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_57ed0ca6-e650-488c-94f1-90f4cdcc9637" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_57ed0ca6-e650-488c-94f1-90f4cdcc9637_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_d4e8be82-c4a2-4def-be00-e2a30e059b31" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_57ed0ca6-e650-488c-94f1-90f4cdcc9637" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_d4e8be82-c4a2-4def-be00-e2a30e059b31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_3593b1c5-d1bf-4018-903a-8c702341c432" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_d4e8be82-c4a2-4def-be00-e2a30e059b31" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_3593b1c5-d1bf-4018-903a-8c702341c432" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_1c28baf5-4157-4259-89f2-5556ca2a7487" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_e64da3bb-7b42-498c-a350-0df96e980b29" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_1c28baf5-4157-4259-89f2-5556ca2a7487" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_19e999b0-165d-45a6-914c-7eb01691e490" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_e64da3bb-7b42-498c-a350-0df96e980b29" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_19e999b0-165d-45a6-914c-7eb01691e490" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_1ee4b344-d788-444b-9656-33c50246b2c0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_e64da3bb-7b42-498c-a350-0df96e980b29" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_1ee4b344-d788-444b-9656-33c50246b2c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_90bb64ff-a979-4a95-8750-5454090e7728" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_e64da3bb-7b42-498c-a350-0df96e980b29" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_90bb64ff-a979-4a95-8750-5454090e7728" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_e0eb700a-7289-43d4-93f7-88e511527b8d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_e64da3bb-7b42-498c-a350-0df96e980b29" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_e0eb700a-7289-43d4-93f7-88e511527b8d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_b6c38f9d-555a-4510-8ce7-50fb3c925fb7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_e64da3bb-7b42-498c-a350-0df96e980b29" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_b6c38f9d-555a-4510-8ce7-50fb3c925fb7" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/INCOMETAXESNarrativeDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#INCOMETAXESNarrativeDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/INCOMETAXESNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsLineItems_46029f55-b949-4882-ad84-1a9a2b363abd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLossCarryforwardsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsTable_8cdb3fb0-4c20-4f45-9d4d-b3b03aaf819d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLossCarryforwardsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_46029f55-b949-4882-ad84-1a9a2b363abd" xlink:to="loc_us-gaap_OperatingLossCarryforwardsTable_8cdb3fb0-4c20-4f45-9d4d-b3b03aaf819d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxPeriodAxis_fee33595-a9d2-4bb5-bde0-a2ebee7f2728" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TaxPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_8cdb3fb0-4c20-4f45-9d4d-b3b03aaf819d" xlink:to="loc_us-gaap_TaxPeriodAxis_fee33595-a9d2-4bb5-bde0-a2ebee7f2728" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxPeriodDomain_fee33595-a9d2-4bb5-bde0-a2ebee7f2728_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TaxPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TaxPeriodAxis_fee33595-a9d2-4bb5-bde0-a2ebee7f2728" xlink:to="loc_us-gaap_TaxPeriodDomain_fee33595-a9d2-4bb5-bde0-a2ebee7f2728_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxPeriodDomain_885af4e6-139a-478a-aeda-7bfa0fdb50a0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TaxPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TaxPeriodAxis_fee33595-a9d2-4bb5-bde0-a2ebee7f2728" xlink:to="loc_us-gaap_TaxPeriodDomain_885af4e6-139a-478a-aeda-7bfa0fdb50a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_IndefiniteMember_d9520b68-9032-4c11-9ac6-e79a164b8dea" xlink:href="wab-20241231.xsd#wab_IndefiniteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxPeriodDomain_885af4e6-139a-478a-aeda-7bfa0fdb50a0" xlink:to="loc_wab_IndefiniteMember_d9520b68-9032-4c11-9ac6-e79a164b8dea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_WithinTenYearsMember_956ecf28-b91a-4b4d-9297-9a9c9dcc7499" xlink:href="wab-20241231.xsd#wab_WithinTenYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxPeriodDomain_885af4e6-139a-478a-aeda-7bfa0fdb50a0" xlink:to="loc_wab_WithinTenYearsMember_956ecf28-b91a-4b4d-9297-9a9c9dcc7499" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_BetweenDecember312034ToDecember312043Member_d68f260b-a94a-45fd-bccd-0c83afb21cb0" xlink:href="wab-20241231.xsd#wab_BetweenDecember312034ToDecember312043Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxPeriodDomain_885af4e6-139a-478a-aeda-7bfa0fdb50a0" xlink:to="loc_wab_BetweenDecember312034ToDecember312043Member_d68f260b-a94a-45fd-bccd-0c83afb21cb0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_faac261a-6f4d-4640-bc9e-95bda90553ea" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_46029f55-b949-4882-ad84-1a9a2b363abd" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_faac261a-6f4d-4640-bc9e-95bda90553ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_c1d8e8af-8f59-4dc3-86ae-b8260682aef2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_46029f55-b949-4882-ad84-1a9a2b363abd" xlink:to="loc_us-gaap_OperatingLossCarryforwards_c1d8e8af-8f59-4dc3-86ae-b8260682aef2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_62a4a03e-0a5f-44ed-934c-e8ba1cc97225" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_UnrecognizedTaxBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_46029f55-b949-4882-ad84-1a9a2b363abd" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_62a4a03e-0a5f-44ed-934c-e8ba1cc97225" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_63115440-180e-45f0-a1a7-caa57de44357" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_46029f55-b949-4882-ad84-1a9a2b363abd" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_63115440-180e-45f0-a1a7-caa57de44357" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationInterestAccrued_524ffbcc-1b89-4373-a64f-f57f78e16775" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeTaxExaminationInterestAccrued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_46029f55-b949-4882-ad84-1a9a2b363abd" xlink:to="loc_us-gaap_IncomeTaxExaminationInterestAccrued_524ffbcc-1b89-4373-a64f-f57f78e16775" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit_9910d863-a59a-4b10-9bd0-f45d4ce08256" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_46029f55-b949-4882-ad84-1a9a2b363abd" xlink:to="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit_9910d863-a59a-4b10-9bd0-f45d4ce08256" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/EARNINGSPERSHARESummaryofComputationofEarningsPerShareDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#EARNINGSPERSHARESummaryofComputationofEarningsPerShareDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/EARNINGSPERSHARESummaryofComputationofEarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDilutedLineItems_f6d0c946-b1d8-4f05-ac6c-50c46e43ad89" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareDilutedLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_76c9b50d-df8d-4e6d-921b-cb951549a30b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_f6d0c946-b1d8-4f05-ac6c-50c46e43ad89" xlink:to="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_76c9b50d-df8d-4e6d-921b-cb951549a30b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_51dfcdad-16d5-40c2-b227-b927d849ee09" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_76c9b50d-df8d-4e6d-921b-cb951549a30b" xlink:to="loc_us-gaap_AwardTypeAxis_51dfcdad-16d5-40c2-b227-b927d849ee09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_51dfcdad-16d5-40c2-b227-b927d849ee09_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_51dfcdad-16d5-40c2-b227-b927d849ee09" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_51dfcdad-16d5-40c2-b227-b927d849ee09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_50c4bd7f-30e7-434c-a8b3-5fb53df0c85e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_51dfcdad-16d5-40c2-b227-b927d849ee09" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_50c4bd7f-30e7-434c-a8b3-5fb53df0c85e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_AwardsExcludingRestrictedStockMember_3f0208f6-6fba-4a4f-b95d-9a49d1dd903c" xlink:href="wab-20241231.xsd#wab_AwardsExcludingRestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_50c4bd7f-30e7-434c-a8b3-5fb53df0c85e" xlink:to="loc_wab_AwardsExcludingRestrictedStockMember_3f0208f6-6fba-4a4f-b95d-9a49d1dd903c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_9c04b079-fa71-4d87-adf9-1ed45954f0f2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_50c4bd7f-30e7-434c-a8b3-5fb53df0c85e" xlink:to="loc_us-gaap_RestrictedStockMember_9c04b079-fa71-4d87-adf9-1ed45954f0f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAbstract_a31fc1ac-9e33-497a-8b06-d9f6fff7f68e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLossAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_f6d0c946-b1d8-4f05-ac6c-50c46e43ad89" xlink:to="loc_us-gaap_NetIncomeLossAbstract_a31fc1ac-9e33-497a-8b06-d9f6fff7f68e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_72bd0246-bad4-4a93-9f2c-f4c55468fa05" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAbstract_a31fc1ac-9e33-497a-8b06-d9f6fff7f68e" xlink:to="loc_us-gaap_NetIncomeLoss_72bd0246-bad4-4a93-9f2c-f4c55468fa05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAllocatedToGeneralPartners_8b10a991-5050-4a7f-9c83-5d09d350f831" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLossAllocatedToGeneralPartners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAbstract_a31fc1ac-9e33-497a-8b06-d9f6fff7f68e" xlink:to="loc_us-gaap_NetIncomeLossAllocatedToGeneralPartners_8b10a991-5050-4a7f-9c83-5d09d350f831" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_c87e8438-c5eb-4370-8cb8-8615dfe58f2d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAbstract_a31fc1ac-9e33-497a-8b06-d9f6fff7f68e" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_c87e8438-c5eb-4370-8cb8-8615dfe58f2d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_c8716f2e-5ebc-4b5b-89da-fcbbb4e89ec8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAbstract_a31fc1ac-9e33-497a-8b06-d9f6fff7f68e" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_c8716f2e-5ebc-4b5b-89da-fcbbb4e89ec8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_8883fd67-04a0-4726-a4d7-c30f18183495" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_f6d0c946-b1d8-4f05-ac6c-50c46e43ad89" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_8883fd67-04a0-4726-a4d7-c30f18183495" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_7af67aae-bb8d-4542-83a4-954b8c666674" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_8883fd67-04a0-4726-a4d7-c30f18183495" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_7af67aae-bb8d-4542-83a4-954b8c666674" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_874cec31-fe6c-48d7-bda4-25f29f940308" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_8883fd67-04a0-4726-a4d7-c30f18183495" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_874cec31-fe6c-48d7-bda4-25f29f940308" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_4d4fc154-61dc-4fde-b716-f4ee05491b44" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_8883fd67-04a0-4726-a4d7-c30f18183495" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_4d4fc154-61dc-4fde-b716-f4ee05491b44" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_EarningsPerShareBasicAndDilutedEPSAbstract_8e8d8fa2-28a5-40bc-8b3f-e7022d811b5a" xlink:href="wab-20241231.xsd#wab_EarningsPerShareBasicAndDilutedEPSAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_f6d0c946-b1d8-4f05-ac6c-50c46e43ad89" xlink:to="loc_wab_EarningsPerShareBasicAndDilutedEPSAbstract_8e8d8fa2-28a5-40bc-8b3f-e7022d811b5a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_8b7803ef-3eda-4e42-8a3a-8ca338abcf9d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_EarningsPerShareBasicAndDilutedEPSAbstract_8e8d8fa2-28a5-40bc-8b3f-e7022d811b5a" xlink:to="loc_us-gaap_EarningsPerShareBasic_8b7803ef-3eda-4e42-8a3a-8ca338abcf9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_8bf5a7af-413d-4137-9bb9-4901edb5ffa9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wab_EarningsPerShareBasicAndDilutedEPSAbstract_8e8d8fa2-28a5-40bc-8b3f-e7022d811b5a" xlink:to="loc_us-gaap_EarningsPerShareDiluted_8bf5a7af-413d-4137-9bb9-4901edb5ffa9" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/STOCKBASEDCOMPENSATIONPLANSNarrativeDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#STOCKBASEDCOMPENSATIONPLANSNarrativeDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/STOCKBASEDCOMPENSATIONPLANSNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a3cce974-1813-4632-a267-847e9230434b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9495105f-011e-4002-838b-c97966c8816a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a3cce974-1813-4632-a267-847e9230434b" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9495105f-011e-4002-838b-c97966c8816a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_cd9b0ceb-4730-4ab4-8510-af1fc4528f64" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9495105f-011e-4002-838b-c97966c8816a" xlink:to="loc_us-gaap_PlanNameAxis_cd9b0ceb-4730-4ab4-8510-af1fc4528f64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_cd9b0ceb-4730-4ab4-8510-af1fc4528f64_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_cd9b0ceb-4730-4ab4-8510-af1fc4528f64" xlink:to="loc_us-gaap_PlanNameDomain_cd9b0ceb-4730-4ab4-8510-af1fc4528f64_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_627db54c-58cd-4303-bd03-50e113cc5674" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_cd9b0ceb-4730-4ab4-8510-af1fc4528f64" xlink:to="loc_us-gaap_PlanNameDomain_627db54c-58cd-4303-bd03-50e113cc5674" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_PlanTwoThousandElevenMember_f237656b-48f1-45ec-9ebe-cf5322d03a4f" xlink:href="wab-20241231.xsd#wab_PlanTwoThousandElevenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_627db54c-58cd-4303-bd03-50e113cc5674" xlink:to="loc_wab_PlanTwoThousandElevenMember_f237656b-48f1-45ec-9ebe-cf5322d03a4f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_DirectorsPlanMember_cafa7c9c-5431-4cf9-b859-e205fc58503a" xlink:href="wab-20241231.xsd#wab_DirectorsPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_627db54c-58cd-4303-bd03-50e113cc5674" xlink:to="loc_wab_DirectorsPlanMember_cafa7c9c-5431-4cf9-b859-e205fc58503a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_PlanTwoThousandMember_7afb620c-7ec9-4d56-9a8b-b0729bafca89" xlink:href="wab-20241231.xsd#wab_PlanTwoThousandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_627db54c-58cd-4303-bd03-50e113cc5674" xlink:to="loc_wab_PlanTwoThousandMember_7afb620c-7ec9-4d56-9a8b-b0729bafca89" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_87765fd2-7292-4f34-8477-742c9f5246f4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9495105f-011e-4002-838b-c97966c8816a" xlink:to="loc_us-gaap_AwardTypeAxis_87765fd2-7292-4f34-8477-742c9f5246f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_87765fd2-7292-4f34-8477-742c9f5246f4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_87765fd2-7292-4f34-8477-742c9f5246f4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_87765fd2-7292-4f34-8477-742c9f5246f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1aea7a31-5e24-47f6-9559-d2579fd08bb7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_87765fd2-7292-4f34-8477-742c9f5246f4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1aea7a31-5e24-47f6-9559-d2579fd08bb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_fdc77e47-8344-40dc-8b3f-889fc4ddfac7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1aea7a31-5e24-47f6-9559-d2579fd08bb7" xlink:to="loc_us-gaap_EmployeeStockOptionMember_fdc77e47-8344-40dc-8b3f-889fc4ddfac7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_fadb45d1-b3c6-471b-a9ab-2dbc8bc9a8f2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1aea7a31-5e24-47f6-9559-d2579fd08bb7" xlink:to="loc_us-gaap_RestrictedStockMember_fadb45d1-b3c6-471b-a9ab-2dbc8bc9a8f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_NonVestedRestrictedStockMember_c8f8bec3-8374-4c80-83bf-d82143313a5f" xlink:href="wab-20241231.xsd#wab_NonVestedRestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1aea7a31-5e24-47f6-9559-d2579fd08bb7" xlink:to="loc_wab_NonVestedRestrictedStockMember_c8f8bec3-8374-4c80-83bf-d82143313a5f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_ad146f42-90f6-49f8-b13f-df55762962f6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1aea7a31-5e24-47f6-9559-d2579fd08bb7" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_ad146f42-90f6-49f8-b13f-df55762962f6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_44d833ab-e560-49ae-98ce-54cbb3a7aec5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1aea7a31-5e24-47f6-9559-d2579fd08bb7" xlink:to="loc_us-gaap_PerformanceSharesMember_44d833ab-e560-49ae-98ce-54cbb3a7aec5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_de9eca19-d5e9-4534-991e-e402603fa25c" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9495105f-011e-4002-838b-c97966c8816a" xlink:to="loc_srt_RangeAxis_de9eca19-d5e9-4534-991e-e402603fa25c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_de9eca19-d5e9-4534-991e-e402603fa25c_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_de9eca19-d5e9-4534-991e-e402603fa25c" xlink:to="loc_srt_RangeMember_de9eca19-d5e9-4534-991e-e402603fa25c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1bc6bb80-6126-45b1-88d3-e6af0fb1a196" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_de9eca19-d5e9-4534-991e-e402603fa25c" xlink:to="loc_srt_RangeMember_1bc6bb80-6126-45b1-88d3-e6af0fb1a196" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_07e87cc8-40d6-47de-889f-9f00737482fe" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1bc6bb80-6126-45b1-88d3-e6af0fb1a196" xlink:to="loc_srt_MinimumMember_07e87cc8-40d6-47de-889f-9f00737482fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_686637ba-3c9b-4f69-9a76-b3e1d00ec24b" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1bc6bb80-6126-45b1-88d3-e6af0fb1a196" xlink:to="loc_srt_MaximumMember_686637ba-3c9b-4f69-9a76-b3e1d00ec24b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_5c195c73-e519-4707-933f-8297c67e3ad4" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9495105f-011e-4002-838b-c97966c8816a" xlink:to="loc_srt_StatementScenarioAxis_5c195c73-e519-4707-933f-8297c67e3ad4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_5c195c73-e519-4707-933f-8297c67e3ad4_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_5c195c73-e519-4707-933f-8297c67e3ad4" xlink:to="loc_srt_ScenarioUnspecifiedDomain_5c195c73-e519-4707-933f-8297c67e3ad4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_1f21b596-3060-4f2d-8b72-518ce021c95d" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_5c195c73-e519-4707-933f-8297c67e3ad4" xlink:to="loc_srt_ScenarioUnspecifiedDomain_1f21b596-3060-4f2d-8b72-518ce021c95d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_d594519e-1045-48c0-b0c5-eed36e11810c" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_1f21b596-3060-4f2d-8b72-518ce021c95d" xlink:to="loc_srt_ScenarioForecastMember_d594519e-1045-48c0-b0c5-eed36e11810c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_b15ae080-b773-4fe2-9860-22a2536258c3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a3cce974-1813-4632-a267-847e9230434b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_b15ae080-b773-4fe2-9860-22a2536258c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_4b3c713c-3623-478d-91d9-0c330090d827" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a3cce974-1813-4632-a267-847e9230434b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_4b3c713c-3623-478d-91d9-0c330090d827" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_bd4144e2-79ad-4f9d-857a-502f6b94f4c6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a3cce974-1813-4632-a267-847e9230434b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_bd4144e2-79ad-4f9d-857a-502f6b94f4c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_676df0fb-2f4a-4142-8393-8ed78449dfa0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a3cce974-1813-4632-a267-847e9230434b" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_676df0fb-2f4a-4142-8393-8ed78449dfa0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_f32471ec-9e9b-49a1-8d58-871cbb1e724e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a3cce974-1813-4632-a267-847e9230434b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_f32471ec-9e9b-49a1-8d58-871cbb1e724e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_e297a451-f3e7-4609-82b5-742d8dbebe85" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a3cce974-1813-4632-a267-847e9230434b" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_e297a451-f3e7-4609-82b5-742d8dbebe85" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_2a29f486-40d0-4636-b0dd-98918ee2a564" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a3cce974-1813-4632-a267-847e9230434b" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_2a29f486-40d0-4636-b0dd-98918ee2a564" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_f01e827f-13f4-414c-90f5-c1e08d1f4b9a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a3cce974-1813-4632-a267-847e9230434b" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_f01e827f-13f4-414c-90f5-c1e08d1f4b9a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_c0e3d98c-86af-45c1-bed0-c5e1533190ac" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a3cce974-1813-4632-a267-847e9230434b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_c0e3d98c-86af-45c1-bed0-c5e1533190ac" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_02b875c7-3097-4210-bf37-cba0da67f605" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a3cce974-1813-4632-a267-847e9230434b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_02b875c7-3097-4210-bf37-cba0da67f605" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_ShareBasedCompensationRelativeTotalStockholderReturnModifierPaymentPercentageIncrease_abd0019d-50a4-4125-8657-230d11257c1d" xlink:href="wab-20241231.xsd#wab_ShareBasedCompensationRelativeTotalStockholderReturnModifierPaymentPercentageIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a3cce974-1813-4632-a267-847e9230434b" xlink:to="loc_wab_ShareBasedCompensationRelativeTotalStockholderReturnModifierPaymentPercentageIncrease_abd0019d-50a4-4125-8657-230d11257c1d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_ShareBasedCompensationRelativeTotalStockholderReturnModifierPaymentPercentageDecrease_d83d285e-a077-41ea-bcea-8cd4b2e2dd86" xlink:href="wab-20241231.xsd#wab_ShareBasedCompensationRelativeTotalStockholderReturnModifierPaymentPercentageDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a3cce974-1813-4632-a267-847e9230434b" xlink:to="loc_wab_ShareBasedCompensationRelativeTotalStockholderReturnModifierPaymentPercentageDecrease_d83d285e-a077-41ea-bcea-8cd4b2e2dd86" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_f7815232-91a5-4f4f-82a7-3d04c187af36" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a3cce974-1813-4632-a267-847e9230434b" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_f7815232-91a5-4f4f-82a7-3d04c187af36" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardAchievementPercentage_c296663d-536c-4d49-b0a4-38630501e056" xlink:href="wab-20241231.xsd#wab_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardAchievementPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a3cce974-1813-4632-a267-847e9230434b" xlink:to="loc_wab_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardAchievementPercentage_c296663d-536c-4d49-b0a4-38630501e056" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/STOCKBASEDCOMPENSATIONPLANSSummaryofRestrictedStockActivityandIncentiveStockAwardsActivityDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#STOCKBASEDCOMPENSATIONPLANSSummaryofRestrictedStockActivityandIncentiveStockAwardsActivityDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/STOCKBASEDCOMPENSATIONPLANSSummaryofRestrictedStockActivityandIncentiveStockAwardsActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_df84a598-1f58-4d15-9582-d5a3789bcd1b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7255e08c-8727-46c6-b246-228a706c2030" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_df84a598-1f58-4d15-9582-d5a3789bcd1b" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7255e08c-8727-46c6-b246-228a706c2030" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_c4cfd30e-66db-4dd7-befb-050c2aaa3ba8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7255e08c-8727-46c6-b246-228a706c2030" xlink:to="loc_us-gaap_AwardTypeAxis_c4cfd30e-66db-4dd7-befb-050c2aaa3ba8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c4cfd30e-66db-4dd7-befb-050c2aaa3ba8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_c4cfd30e-66db-4dd7-befb-050c2aaa3ba8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c4cfd30e-66db-4dd7-befb-050c2aaa3ba8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cf54301e-39ab-4617-b3f8-fec16ea28f0c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_c4cfd30e-66db-4dd7-befb-050c2aaa3ba8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cf54301e-39ab-4617-b3f8-fec16ea28f0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_RestrictedStockAndUnitsMember_ff27105b-6db3-4142-b365-2ef160561617" xlink:href="wab-20241231.xsd#wab_RestrictedStockAndUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cf54301e-39ab-4617-b3f8-fec16ea28f0c" xlink:to="loc_wab_RestrictedStockAndUnitsMember_ff27105b-6db3-4142-b365-2ef160561617" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_ecddd55e-e901-4933-96d1-2be763d35d77" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cf54301e-39ab-4617-b3f8-fec16ea28f0c" xlink:to="loc_us-gaap_PerformanceSharesMember_ecddd55e-e901-4933-96d1-2be763d35d77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_ea8eaf28-f1bf-4f02-a26f-2c02b59a3896" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_df84a598-1f58-4d15-9582-d5a3789bcd1b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_ea8eaf28-f1bf-4f02-a26f-2c02b59a3896" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_5124fdc9-0bb8-4954-b197-0ce93f39da5e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_ea8eaf28-f1bf-4f02-a26f-2c02b59a3896" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_5124fdc9-0bb8-4954-b197-0ce93f39da5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_84cb70cc-ec8c-4898-adc1-87d6a682a1ad" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_ea8eaf28-f1bf-4f02-a26f-2c02b59a3896" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_84cb70cc-ec8c-4898-adc1-87d6a682a1ad" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_bbbb4d94-ece4-490e-9dd4-673e2ad7c508" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_ea8eaf28-f1bf-4f02-a26f-2c02b59a3896" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_bbbb4d94-ece4-490e-9dd4-673e2ad7c508" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberExpectedToVest_cf034c2b-1252-4c57-ba98-4c30a5e66315" xlink:href="wab-20241231.xsd#wab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberExpectedToVest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_ea8eaf28-f1bf-4f02-a26f-2c02b59a3896" xlink:to="loc_wab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberExpectedToVest_cf034c2b-1252-4c57-ba98-4c30a5e66315" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_fa31df25-1d7f-4230-b859-a9e73a7badbe" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_ea8eaf28-f1bf-4f02-a26f-2c02b59a3896" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_fa31df25-1d7f-4230-b859-a9e73a7badbe" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_81f16399-1e60-4654-a4bf-d938a6414d10" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_8d4a315c-1b21-4fe8-91a2-c5ee4d01f37f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_df84a598-1f58-4d15-9582-d5a3789bcd1b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_8d4a315c-1b21-4fe8-91a2-c5ee4d01f37f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_08dcd127-d5bf-4542-ad14-1c6198fb6ed6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_8d4a315c-1b21-4fe8-91a2-c5ee4d01f37f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_08dcd127-d5bf-4542-ad14-1c6198fb6ed6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_660992fb-0807-4057-b5a6-d55be8788e72" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_8d4a315c-1b21-4fe8-91a2-c5ee4d01f37f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_660992fb-0807-4057-b5a6-d55be8788e72" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_7634f16d-bff9-466f-bfcb-900826bed943" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_8d4a315c-1b21-4fe8-91a2-c5ee4d01f37f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_7634f16d-bff9-466f-bfcb-900826bed943" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNetPerformanceAdjustmentWeightedAverageNetPerformanceAdjustmentFairValue_d83e93a0-e1bb-4929-bd8a-b1212c43c3e3" xlink:href="wab-20241231.xsd#wab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNetPerformanceAdjustmentWeightedAverageNetPerformanceAdjustmentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_8d4a315c-1b21-4fe8-91a2-c5ee4d01f37f" xlink:to="loc_wab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNetPerformanceAdjustmentWeightedAverageNetPerformanceAdjustmentFairValue_d83e93a0-e1bb-4929-bd8a-b1212c43c3e3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_c4fbafc4-f37a-4382-9080-69d29a0c512e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_8d4a315c-1b21-4fe8-91a2-c5ee4d01f37f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_c4fbafc4-f37a-4382-9080-69d29a0c512e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_4dff2804-a1a7-46d5-bbeb-4e0d74a55359" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/ACCUMULATEDOTHERCOMPREHENSIVELOSSDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#ACCUMULATEDOTHERCOMPREHENSIVELOSSDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/ACCUMULATEDOTHERCOMPREHENSIVELOSSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_d67f9105-a794-4884-b5c6-7cf3f84f6e02" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_e860b3ee-7339-4411-ada4-6eba463fb65c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_d67f9105-a794-4884-b5c6-7cf3f84f6e02" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_e860b3ee-7339-4411-ada4-6eba463fb65c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_0131badf-b713-49c1-9377-c324fa4c4ac0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_e860b3ee-7339-4411-ada4-6eba463fb65c" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_0131badf-b713-49c1-9377-c324fa4c4ac0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_0131badf-b713-49c1-9377-c324fa4c4ac0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_0131badf-b713-49c1-9377-c324fa4c4ac0" xlink:to="loc_us-gaap_EquityComponentDomain_0131badf-b713-49c1-9377-c324fa4c4ac0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_cf7a1aff-4661-46fe-b82e-d468fca3e918" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_0131badf-b713-49c1-9377-c324fa4c4ac0" xlink:to="loc_us-gaap_EquityComponentDomain_cf7a1aff-4661-46fe-b82e-d468fca3e918" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_8d7a3512-7de4-4e3c-97a3-86ebab677b16" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_cf7a1aff-4661-46fe-b82e-d468fca3e918" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_8d7a3512-7de4-4e3c-97a3-86ebab677b16" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_10f69ea0-3a24-4f35-b862-ab3baca3a69f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_8d7a3512-7de4-4e3c-97a3-86ebab677b16" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_10f69ea0-3a24-4f35-b862-ab3baca3a69f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_6c6342ac-201b-4f11-9dc3-06dd189580b3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_8d7a3512-7de4-4e3c-97a3-86ebab677b16" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_6c6342ac-201b-4f11-9dc3-06dd189580b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_3be29a16-b535-4f2c-ad69-58bfb0f761b4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_8d7a3512-7de4-4e3c-97a3-86ebab677b16" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_3be29a16-b535-4f2c-ad69-58bfb0f761b4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_df8cb1fc-8d63-4ad3-a524-12cb963b2bee" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_d67f9105-a794-4884-b5c6-7cf3f84f6e02" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_df8cb1fc-8d63-4ad3-a524-12cb963b2bee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2a404835-eb4c-44ac-9b02-48bd11a29b7e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_df8cb1fc-8d63-4ad3-a524-12cb963b2bee" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2a404835-eb4c-44ac-9b02-48bd11a29b7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_d6a1bbee-2537-4e89-9590-ff90536b65af" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_df8cb1fc-8d63-4ad3-a524-12cb963b2bee" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_d6a1bbee-2537-4e89-9590-ff90536b65af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_33e71063-5328-4873-814d-7afeb9817fa9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_df8cb1fc-8d63-4ad3-a524-12cb963b2bee" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_33e71063-5328-4873-814d-7afeb9817fa9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_9e5dbfcc-421f-40d4-9ce6-dc12d538bd5d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_df8cb1fc-8d63-4ad3-a524-12cb963b2bee" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_9e5dbfcc-421f-40d4-9ce6-dc12d538bd5d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_c4ac7dfe-f028-4dfb-a5e4-7a894f9aa9ad" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_df8cb1fc-8d63-4ad3-a524-12cb963b2bee" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_c4ac7dfe-f028-4dfb-a5e4-7a894f9aa9ad" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_0889d942-baf4-4efb-8aa1-d3e11aa1eca4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/FAIRVALUEMEASUREMENTANDDERIVATIVEINSTRUMENTSNarrativeDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#FAIRVALUEMEASUREMENTANDDERIVATIVEINSTRUMENTSNarrativeDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/FAIRVALUEMEASUREMENTANDDERIVATIVEINSTRUMENTSNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_a4f02680-f2b2-4a64-82a2-3e052dfb424b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_baa70279-3de0-4441-bd4e-88f37e676844" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_a4f02680-f2b2-4a64-82a2-3e052dfb424b" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_baa70279-3de0-4441-bd4e-88f37e676844" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_20301ec3-f90d-44fd-9eed-68b17eb3b291" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_baa70279-3de0-4441-bd4e-88f37e676844" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_20301ec3-f90d-44fd-9eed-68b17eb3b291" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_20301ec3-f90d-44fd-9eed-68b17eb3b291_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_20301ec3-f90d-44fd-9eed-68b17eb3b291" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_20301ec3-f90d-44fd-9eed-68b17eb3b291_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_e053e22f-747d-4e09-b7ff-f77ca17919d8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_20301ec3-f90d-44fd-9eed-68b17eb3b291" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_e053e22f-747d-4e09-b7ff-f77ca17919d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_OtherAccruedLiabilitiesMember_3e9aa503-a92f-4db4-b61e-e7ad2bc6339a" xlink:href="wab-20241231.xsd#wab_OtherAccruedLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_e053e22f-747d-4e09-b7ff-f77ca17919d8" xlink:to="loc_wab_OtherAccruedLiabilitiesMember_3e9aa503-a92f-4db4-b61e-e7ad2bc6339a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_88cd68a6-3c55-49bf-adad-378c11c301a0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_baa70279-3de0-4441-bd4e-88f37e676844" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_88cd68a6-3c55-49bf-adad-378c11c301a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_88cd68a6-3c55-49bf-adad-378c11c301a0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_88cd68a6-3c55-49bf-adad-378c11c301a0" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_88cd68a6-3c55-49bf-adad-378c11c301a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c0098a07-7194-4c7d-acd2-53e9cf29098e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_88cd68a6-3c55-49bf-adad-378c11c301a0" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c0098a07-7194-4c7d-acd2-53e9cf29098e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_GeneralElectricCompanyMember_496ad9b8-9a37-44eb-aae1-d4dd83bfdb26" xlink:href="wab-20241231.xsd#wab_GeneralElectricCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c0098a07-7194-4c7d-acd2-53e9cf29098e" xlink:to="loc_wab_GeneralElectricCompanyMember_496ad9b8-9a37-44eb-aae1-d4dd83bfdb26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_cf7d6133-9b44-4e52-a436-8ea6d134344f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_baa70279-3de0-4441-bd4e-88f37e676844" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_cf7d6133-9b44-4e52-a436-8ea6d134344f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_cf7d6133-9b44-4e52-a436-8ea6d134344f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_cf7d6133-9b44-4e52-a436-8ea6d134344f" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_cf7d6133-9b44-4e52-a436-8ea6d134344f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8ef18189-b9ae-4def-a120-995df46d223a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_cf7d6133-9b44-4e52-a436-8ea6d134344f" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8ef18189-b9ae-4def-a120-995df46d223a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_ed8a41d0-06bf-491e-88a9-149cfd859cfb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8ef18189-b9ae-4def-a120-995df46d223a" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_ed8a41d0-06bf-491e-88a9-149cfd859cfb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_42f11067-e693-4a4f-9251-4ff2aea512e4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_baa70279-3de0-4441-bd4e-88f37e676844" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_42f11067-e693-4a4f-9251-4ff2aea512e4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_42f11067-e693-4a4f-9251-4ff2aea512e4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_42f11067-e693-4a4f-9251-4ff2aea512e4" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_42f11067-e693-4a4f-9251-4ff2aea512e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_18109c61-430d-463b-944d-94484b54bab1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_42f11067-e693-4a4f-9251-4ff2aea512e4" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_18109c61-430d-463b-944d-94484b54bab1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_355db935-db9c-417e-91b7-1988976c9441" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_18109c61-430d-463b-944d-94484b54bab1" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_355db935-db9c-417e-91b7-1988976c9441" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_88af58f9-ff88-4fb8-bb80-08ee9c2e84e4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_baa70279-3de0-4441-bd4e-88f37e676844" xlink:to="loc_us-gaap_HedgingDesignationAxis_88af58f9-ff88-4fb8-bb80-08ee9c2e84e4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_88af58f9-ff88-4fb8-bb80-08ee9c2e84e4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_88af58f9-ff88-4fb8-bb80-08ee9c2e84e4" xlink:to="loc_us-gaap_HedgingDesignationDomain_88af58f9-ff88-4fb8-bb80-08ee9c2e84e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_ba2329df-7914-4894-958d-f5523640c4b6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_88af58f9-ff88-4fb8-bb80-08ee9c2e84e4" xlink:to="loc_us-gaap_HedgingDesignationDomain_ba2329df-7914-4894-958d-f5523640c4b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_3ca62f09-4671-4b5e-aba2-625b3c85aafb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_ba2329df-7914-4894-958d-f5523640c4b6" xlink:to="loc_us-gaap_NondesignatedMember_3ca62f09-4671-4b5e-aba2-625b3c85aafb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_bd6b7859-a994-437f-8fc8-29a38980041d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_a4f02680-f2b2-4a64-82a2-3e052dfb424b" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_bd6b7859-a994-437f-8fc8-29a38980041d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTermOfContract_01097e7d-ecc4-4819-8cf0-46261a4641e9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_a4f02680-f2b2-4a64-82a2-3e052dfb424b" xlink:to="loc_us-gaap_DerivativeTermOfContract_01097e7d-ecc4-4819-8cf0-46261a4641e9" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/FAIRVALUEMEASUREMENTANDDERIVATIVEINSTRUMENTSSummaryofLiabilitiesCarriedatFairValueMeasuredonRecurringBasisDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#FAIRVALUEMEASUREMENTANDDERIVATIVEINSTRUMENTSSummaryofLiabilitiesCarriedatFairValueMeasuredonRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/FAIRVALUEMEASUREMENTANDDERIVATIVEINSTRUMENTSSummaryofLiabilitiesCarriedatFairValueMeasuredonRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_33786979-afa1-4cbe-8a83-e3c96b9ec273" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_433f861d-4a09-447b-80c9-3c2e9b13f739" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_33786979-afa1-4cbe-8a83-e3c96b9ec273" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_433f861d-4a09-447b-80c9-3c2e9b13f739" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_a207ea2e-ebb2-41f6-a14c-e78fee87fb63" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_433f861d-4a09-447b-80c9-3c2e9b13f739" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_a207ea2e-ebb2-41f6-a14c-e78fee87fb63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_a207ea2e-ebb2-41f6-a14c-e78fee87fb63_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_a207ea2e-ebb2-41f6-a14c-e78fee87fb63" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_a207ea2e-ebb2-41f6-a14c-e78fee87fb63_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_d0c47dba-8b84-4f57-b7f4-0b7cb2599165" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_a207ea2e-ebb2-41f6-a14c-e78fee87fb63" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_d0c47dba-8b84-4f57-b7f4-0b7cb2599165" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_e62f8637-ae48-409e-a5f1-35c5ddb40490" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_d0c47dba-8b84-4f57-b7f4-0b7cb2599165" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_e62f8637-ae48-409e-a5f1-35c5ddb40490" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_55c8b305-99f6-4c81-8813-112d8962d66e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherCurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_d0c47dba-8b84-4f57-b7f4-0b7cb2599165" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_55c8b305-99f6-4c81-8813-112d8962d66e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_76cacd11-a6c0-4d8c-af00-db246c6e08a4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_433f861d-4a09-447b-80c9-3c2e9b13f739" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_76cacd11-a6c0-4d8c-af00-db246c6e08a4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_76cacd11-a6c0-4d8c-af00-db246c6e08a4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_76cacd11-a6c0-4d8c-af00-db246c6e08a4" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_76cacd11-a6c0-4d8c-af00-db246c6e08a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_5616b2b0-21c7-4da5-95ef-e28fac524ab4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_76cacd11-a6c0-4d8c-af00-db246c6e08a4" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_5616b2b0-21c7-4da5-95ef-e28fac524ab4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_9dbc99b3-c481-43ec-8360-293525f2d40b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_5616b2b0-21c7-4da5-95ef-e28fac524ab4" xlink:to="loc_us-gaap_ForeignExchangeContractMember_9dbc99b3-c481-43ec-8360-293525f2d40b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_bffe0218-78b7-4e7b-8a41-821cf5235e43" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_5616b2b0-21c7-4da5-95ef-e28fac524ab4" xlink:to="loc_us-gaap_InterestRateContractMember_bffe0218-78b7-4e7b-8a41-821cf5235e43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_04edf684-33d3-427b-aaa0-8714886fc5d3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_433f861d-4a09-447b-80c9-3c2e9b13f739" xlink:to="loc_us-gaap_HedgingDesignationAxis_04edf684-33d3-427b-aaa0-8714886fc5d3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_04edf684-33d3-427b-aaa0-8714886fc5d3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_04edf684-33d3-427b-aaa0-8714886fc5d3" xlink:to="loc_us-gaap_HedgingDesignationDomain_04edf684-33d3-427b-aaa0-8714886fc5d3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_9c12faff-a241-471e-9aa1-251190a305e9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_04edf684-33d3-427b-aaa0-8714886fc5d3" xlink:to="loc_us-gaap_HedgingDesignationDomain_9c12faff-a241-471e-9aa1-251190a305e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_443812a1-2c1e-4420-84d0-3e1867da142a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_9c12faff-a241-471e-9aa1-251190a305e9" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_443812a1-2c1e-4420-84d0-3e1867da142a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_99e438b1-7b91-4d05-8fce-d40507d4c36e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_9c12faff-a241-471e-9aa1-251190a305e9" xlink:to="loc_us-gaap_NondesignatedMember_99e438b1-7b91-4d05-8fce-d40507d4c36e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_67dc1a52-454f-4d19-976a-c7c6f4993fa0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_33786979-afa1-4cbe-8a83-e3c96b9ec273" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_67dc1a52-454f-4d19-976a-c7c6f4993fa0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_4ea47ff1-e4c0-486f-bf5e-cfa4ced4822c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_33786979-afa1-4cbe-8a83-e3c96b9ec273" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_4ea47ff1-e4c0-486f-bf5e-cfa4ced4822c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeNet_23d1f1bf-4595-4799-b4cd-1161d4b510a8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeFairValueOfDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_33786979-afa1-4cbe-8a83-e3c96b9ec273" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeNet_23d1f1bf-4595-4799-b4cd-1161d4b510a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_8608662a-38c6-4fb6-a144-8b1280bcd02e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_33786979-afa1-4cbe-8a83-e3c96b9ec273" xlink:to="loc_us-gaap_DerivativeNotionalAmount_8608662a-38c6-4fb6-a144-8b1280bcd02e" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/COMMITMENTSANDCONTINGENCIESDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#COMMITMENTSANDCONTINGENCIESDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/COMMITMENTSANDCONTINGENCIESDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_44a22c3d-8532-4c8d-b4fc-3dddf5bb15a3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_baf33d7d-c3ad-4f2a-ac92-6547e5014aae" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_44a22c3d-8532-4c8d-b4fc-3dddf5bb15a3" xlink:to="loc_us-gaap_LossContingenciesTable_baf33d7d-c3ad-4f2a-ac92-6547e5014aae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_7f3ff619-c87c-42e2-b11f-4fa070d6e128" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_baf33d7d-c3ad-4f2a-ac92-6547e5014aae" xlink:to="loc_srt_ConsolidatedEntitiesAxis_7f3ff619-c87c-42e2-b11f-4fa070d6e128" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_7f3ff619-c87c-42e2-b11f-4fa070d6e128_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_7f3ff619-c87c-42e2-b11f-4fa070d6e128" xlink:to="loc_srt_ConsolidatedEntitiesDomain_7f3ff619-c87c-42e2-b11f-4fa070d6e128_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_7a9e26e5-4f87-48c5-9b95-de73d5c55974" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_7f3ff619-c87c-42e2-b11f-4fa070d6e128" xlink:to="loc_srt_ConsolidatedEntitiesDomain_7a9e26e5-4f87-48c5-9b95-de73d5c55974" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SubsidiariesMember_329d84af-ad71-4b54-8709-fda45e8bf8d8" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_SubsidiariesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_7a9e26e5-4f87-48c5-9b95-de73d5c55974" xlink:to="loc_srt_SubsidiariesMember_329d84af-ad71-4b54-8709-fda45e8bf8d8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_8d682ea7-405e-44f2-b79a-22392bb2803f" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_baf33d7d-c3ad-4f2a-ac92-6547e5014aae" xlink:to="loc_srt_LitigationCaseAxis_8d682ea7-405e-44f2-b79a-22392bb2803f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_8d682ea7-405e-44f2-b79a-22392bb2803f_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_8d682ea7-405e-44f2-b79a-22392bb2803f" xlink:to="loc_srt_LitigationCaseTypeDomain_8d682ea7-405e-44f2-b79a-22392bb2803f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_52c9e872-dce9-4dad-99e0-f204ec7957df" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_8d682ea7-405e-44f2-b79a-22392bb2803f" xlink:to="loc_srt_LitigationCaseTypeDomain_52c9e872-dce9-4dad-99e0-f204ec7957df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_DenverTransitInstallationofConstantWirelessCrossingsMember_4c304534-4621-4efa-8b87-902134e3bede" xlink:href="wab-20241231.xsd#wab_DenverTransitInstallationofConstantWirelessCrossingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_52c9e872-dce9-4dad-99e0-f204ec7957df" xlink:to="loc_wab_DenverTransitInstallationofConstantWirelessCrossingsMember_4c304534-4621-4efa-8b87-902134e3bede" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusAxis_ca42efbd-8f07-47be-b338-d0571bed0bf4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LitigationStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_baf33d7d-c3ad-4f2a-ac92-6547e5014aae" xlink:to="loc_us-gaap_LitigationStatusAxis_ca42efbd-8f07-47be-b338-d0571bed0bf4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_ca42efbd-8f07-47be-b338-d0571bed0bf4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LitigationStatusAxis_ca42efbd-8f07-47be-b338-d0571bed0bf4" xlink:to="loc_us-gaap_LitigationStatusDomain_ca42efbd-8f07-47be-b338-d0571bed0bf4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_6886de8c-a48e-4894-a829-dd1fa6da5674" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LitigationStatusAxis_ca42efbd-8f07-47be-b338-d0571bed0bf4" xlink:to="loc_us-gaap_LitigationStatusDomain_6886de8c-a48e-4894-a829-dd1fa6da5674" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ThreatenedLitigationMember_4f8e96fc-1d6a-49e4-8b8b-43898a5a23ca" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ThreatenedLitigationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationStatusDomain_6886de8c-a48e-4894-a829-dd1fa6da5674" xlink:to="loc_us-gaap_ThreatenedLitigationMember_4f8e96fc-1d6a-49e4-8b8b-43898a5a23ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyDamagesSoughtValue_75250331-9a64-47e6-8813-b6a1212c1d0c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LossContingencyDamagesSoughtValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_44a22c3d-8532-4c8d-b4fc-3dddf5bb15a3" xlink:to="loc_us-gaap_LossContingencyDamagesSoughtValue_75250331-9a64-47e6-8813-b6a1212c1d0c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/SEGMENTINFORMATIONSummaryofSegmentFinancialInformationDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#SEGMENTINFORMATIONSummaryofSegmentFinancialInformationDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/SEGMENTINFORMATIONSummaryofSegmentFinancialInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_800095f3-cff7-4225-9c2e-a2bace098f03" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_44252064-403e-41c4-b712-b8cb19d66c61" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_800095f3-cff7-4225-9c2e-a2bace098f03" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_44252064-403e-41c4-b712-b8cb19d66c61" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_d4352d99-8dd7-4872-9240-476bb4f9c04f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_44252064-403e-41c4-b712-b8cb19d66c61" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_d4352d99-8dd7-4872-9240-476bb4f9c04f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_d4352d99-8dd7-4872-9240-476bb4f9c04f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_d4352d99-8dd7-4872-9240-476bb4f9c04f" xlink:to="loc_us-gaap_SegmentDomain_d4352d99-8dd7-4872-9240-476bb4f9c04f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_a0a17974-4d5b-4e75-bc08-6d8b60a4b7d7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_d4352d99-8dd7-4872-9240-476bb4f9c04f" xlink:to="loc_us-gaap_SegmentDomain_a0a17974-4d5b-4e75-bc08-6d8b60a4b7d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_FreightSegmentMember_49fef9d9-2d4e-48ed-81ab-623a12937aeb" xlink:href="wab-20241231.xsd#wab_FreightSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a0a17974-4d5b-4e75-bc08-6d8b60a4b7d7" xlink:to="loc_wab_FreightSegmentMember_49fef9d9-2d4e-48ed-81ab-623a12937aeb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_TransitSegmentMember_7d59629d-2901-402e-9cdb-038d928cc4f8" xlink:href="wab-20241231.xsd#wab_TransitSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a0a17974-4d5b-4e75-bc08-6d8b60a4b7d7" xlink:to="loc_wab_TransitSegmentMember_7d59629d-2901-402e-9cdb-038d928cc4f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_fa3da975-a188-4902-ba5f-fe0205b6bd28" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_44252064-403e-41c4-b712-b8cb19d66c61" xlink:to="loc_srt_ConsolidationItemsAxis_fa3da975-a188-4902-ba5f-fe0205b6bd28" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_fa3da975-a188-4902-ba5f-fe0205b6bd28_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_fa3da975-a188-4902-ba5f-fe0205b6bd28" xlink:to="loc_srt_ConsolidationItemsDomain_fa3da975-a188-4902-ba5f-fe0205b6bd28_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_62856d1b-400d-4f1e-b0a7-10b0c539070d" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_fa3da975-a188-4902-ba5f-fe0205b6bd28" xlink:to="loc_srt_ConsolidationItemsDomain_62856d1b-400d-4f1e-b0a7-10b0c539070d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_787e7310-5c20-4a94-b946-e58674bacc1a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_62856d1b-400d-4f1e-b0a7-10b0c539070d" xlink:to="loc_us-gaap_OperatingSegmentsMember_787e7310-5c20-4a94-b946-e58674bacc1a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_65d1d02f-f83b-4f19-b77b-75bafd684216" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_62856d1b-400d-4f1e-b0a7-10b0c539070d" xlink:to="loc_us-gaap_IntersegmentEliminationMember_65d1d02f-f83b-4f19-b77b-75bafd684216" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_a604c8b0-5abf-4a48-b1d1-99196f757ecd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_62856d1b-400d-4f1e-b0a7-10b0c539070d" xlink:to="loc_us-gaap_CorporateNonSegmentMember_a604c8b0-5abf-4a48-b1d1-99196f757ecd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_6b1e9a23-af3d-4d5b-a467-ee30aff428bb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_800095f3-cff7-4225-9c2e-a2bace098f03" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_6b1e9a23-af3d-4d5b-a467-ee30aff428bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_483e403e-163c-40b2-b44f-ed0c17de3706" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_800095f3-cff7-4225-9c2e-a2bace098f03" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_483e403e-163c-40b2-b44f-ed0c17de3706" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_81ebc40a-d0bf-476a-b036-eb3f99d13476" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSold_483e403e-163c-40b2-b44f-ed0c17de3706" xlink:to="loc_us-gaap_GrossProfit_81ebc40a-d0bf-476a-b036-eb3f99d13476" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_GrossMarginPercent_60985723-adcd-4c4a-a718-cf0aa1a4bbea" xlink:href="wab-20241231.xsd#wab_GrossMarginPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSold_483e403e-163c-40b2-b44f-ed0c17de3706" xlink:to="loc_wab_GrossMarginPercent_60985723-adcd-4c4a-a718-cf0aa1a4bbea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_5abb50e3-48b1-4861-9837-ba1e00a0b6b9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_800095f3-cff7-4225-9c2e-a2bace098f03" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_5abb50e3-48b1-4861-9837-ba1e00a0b6b9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_1f219a75-50f9-43a3-8df4-cc727c68c2fe" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_800095f3-cff7-4225-9c2e-a2bace098f03" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_1f219a75-50f9-43a3-8df4-cc727c68c2fe" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_fd11aeb2-229f-4b71-8808-f1fbf7563c03" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_800095f3-cff7-4225-9c2e-a2bace098f03" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_fd11aeb2-229f-4b71-8808-f1fbf7563c03" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_0e3c9052-7880-497f-a87f-3b0076caf427" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_800095f3-cff7-4225-9c2e-a2bace098f03" xlink:to="loc_us-gaap_OperatingIncomeLoss_0e3c9052-7880-497f-a87f-3b0076caf427" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_8e4c8fb3-d8e0-4cf5-9d2b-280cc75501f4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_800095f3-cff7-4225-9c2e-a2bace098f03" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_8e4c8fb3-d8e0-4cf5-9d2b-280cc75501f4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_InterestExpenseAndOtherNet_22d2da29-00e6-4f2e-82d4-4af3770c9a1e" xlink:href="wab-20241231.xsd#wab_InterestExpenseAndOtherNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_800095f3-cff7-4225-9c2e-a2bace098f03" xlink:to="loc_wab_InterestExpenseAndOtherNet_22d2da29-00e6-4f2e-82d4-4af3770c9a1e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_d46183b2-3fdc-4776-af87-923cf4fef946" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_800095f3-cff7-4225-9c2e-a2bace098f03" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_d46183b2-3fdc-4776-af87-923cf4fef946" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_ea72bd70-d74c-4e37-b5ea-5dedc6f81c62" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_800095f3-cff7-4225-9c2e-a2bace098f03" xlink:to="loc_us-gaap_DepreciationAndAmortization_ea72bd70-d74c-4e37-b5ea-5dedc6f81c62" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_f4981103-f2ad-4e46-b35b-74d52948c3fb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentExpenditureAdditionToLongLivedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_800095f3-cff7-4225-9c2e-a2bace098f03" xlink:to="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_f4981103-f2ad-4e46-b35b-74d52948c3fb" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_b1d0c160-f16f-47bf-98af-1fe7590636ec" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_800095f3-cff7-4225-9c2e-a2bace098f03" xlink:to="loc_us-gaap_Assets_b1d0c160-f16f-47bf-98af-1fe7590636ec" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/SEGMENTINFORMATIONSummaryofGeographicAreaDataDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#SEGMENTINFORMATIONSummaryofGeographicAreaDataDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/SEGMENTINFORMATIONSummaryofGeographicAreaDataDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_12fcf3da-fbcc-4775-8808-bc1b67e1b468" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_98c4cf89-af85-4959-8dfa-9cfce3a1c1cc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_12fcf3da-fbcc-4775-8808-bc1b67e1b468" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_98c4cf89-af85-4959-8dfa-9cfce3a1c1cc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_34fa8bb7-906d-43db-a46e-de4d74c08108" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_98c4cf89-af85-4959-8dfa-9cfce3a1c1cc" xlink:to="loc_srt_StatementGeographicalAxis_34fa8bb7-906d-43db-a46e-de4d74c08108" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_34fa8bb7-906d-43db-a46e-de4d74c08108_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_34fa8bb7-906d-43db-a46e-de4d74c08108" xlink:to="loc_srt_SegmentGeographicalDomain_34fa8bb7-906d-43db-a46e-de4d74c08108_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_188e3888-e259-45f5-98c7-b8780185a15c" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_34fa8bb7-906d-43db-a46e-de4d74c08108" xlink:to="loc_srt_SegmentGeographicalDomain_188e3888-e259-45f5-98c7-b8780185a15c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NorthAmericaMember_ab18eac4-0c73-4f3b-89cc-e6292b74ee35" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_NorthAmericaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_188e3888-e259-45f5-98c7-b8780185a15c" xlink:to="loc_srt_NorthAmericaMember_ab18eac4-0c73-4f3b-89cc-e6292b74ee35" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_135bf5ac-40d6-46c5-9185-867dbb1c6586" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NorthAmericaMember_ab18eac4-0c73-4f3b-89cc-e6292b74ee35" xlink:to="loc_country_US_135bf5ac-40d6-46c5-9185-867dbb1c6586" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CA_ee96a0d8-9139-4e0a-a4c4-919da679a3d4" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NorthAmericaMember_ab18eac4-0c73-4f3b-89cc-e6292b74ee35" xlink:to="loc_country_CA_ee96a0d8-9139-4e0a-a4c4-919da679a3d4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_MX_7be09bc9-b0c3-489c-a9ef-05f8ed3bf9b5" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_MX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NorthAmericaMember_ab18eac4-0c73-4f3b-89cc-e6292b74ee35" xlink:to="loc_country_MX_7be09bc9-b0c3-489c-a9ef-05f8ed3bf9b5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SouthAmericaMember_363bd4de-053f-42ae-8135-6bff73bf862d" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_SouthAmericaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_188e3888-e259-45f5-98c7-b8780185a15c" xlink:to="loc_srt_SouthAmericaMember_363bd4de-053f-42ae-8135-6bff73bf862d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EuropeMember_c571f521-6381-4950-8ae6-fd4aedc5d5b7" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_EuropeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_188e3888-e259-45f5-98c7-b8780185a15c" xlink:to="loc_srt_EuropeMember_c571f521-6381-4950-8ae6-fd4aedc5d5b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_DE_96e769f2-4e1a-49b0-8f4f-d4669134a2c3" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_DE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EuropeMember_c571f521-6381-4950-8ae6-fd4aedc5d5b7" xlink:to="loc_country_DE_96e769f2-4e1a-49b0-8f4f-d4669134a2c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_FR_479cbdc2-9029-4bf8-9cbc-3263b85addee" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_FR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EuropeMember_c571f521-6381-4950-8ae6-fd4aedc5d5b7" xlink:to="loc_country_FR_479cbdc2-9029-4bf8-9cbc-3263b85addee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_f93f01d0-0764-4de0-91de-96a79b63204a" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EuropeMember_c571f521-6381-4950-8ae6-fd4aedc5d5b7" xlink:to="loc_country_GB_f93f01d0-0764-4de0-91de-96a79b63204a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_IT_65bfa52f-5838-490d-bc7c-8f026f3f194f" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_IT"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EuropeMember_c571f521-6381-4950-8ae6-fd4aedc5d5b7" xlink:to="loc_country_IT_65bfa52f-5838-490d-bc7c-8f026f3f194f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_OtherEuropeMember_bbdd970e-c0a2-4082-aae9-88552b987e1b" xlink:href="wab-20241231.xsd#wab_OtherEuropeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EuropeMember_c571f521-6381-4950-8ae6-fd4aedc5d5b7" xlink:to="loc_wab_OtherEuropeMember_bbdd970e-c0a2-4082-aae9-88552b987e1b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_IN_2e852007-fe3d-4d62-988d-1cf4e6d605f0" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_IN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_188e3888-e259-45f5-98c7-b8780185a15c" xlink:to="loc_country_IN_2e852007-fe3d-4d62-988d-1cf4e6d605f0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_KazakhstanRussiaAndCISMember_1f035e95-5654-4469-8580-025809e13b97" xlink:href="wab-20241231.xsd#wab_KazakhstanRussiaAndCISMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_188e3888-e259-45f5-98c7-b8780185a15c" xlink:to="loc_wab_KazakhstanRussiaAndCISMember_1f035e95-5654-4469-8580-025809e13b97" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_AustraliaAndNewZealandMember_68ba3233-dd2d-4aa6-9abb-63d1e76bebf3" xlink:href="wab-20241231.xsd#wab_AustraliaAndNewZealandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_188e3888-e259-45f5-98c7-b8780185a15c" xlink:to="loc_wab_AustraliaAndNewZealandMember_68ba3233-dd2d-4aa6-9abb-63d1e76bebf3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_635487e5-ce51-4d1a-a8b8-c814d43a2bc3" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_188e3888-e259-45f5-98c7-b8780185a15c" xlink:to="loc_country_CN_635487e5-ce51-4d1a-a8b8-c814d43a2bc3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_OtherAsiaAndMiddleEastMember_a48eb2d1-a6ee-4cf1-95ff-185f185e0004" xlink:href="wab-20241231.xsd#wab_OtherAsiaAndMiddleEastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_188e3888-e259-45f5-98c7-b8780185a15c" xlink:to="loc_wab_OtherAsiaAndMiddleEastMember_a48eb2d1-a6ee-4cf1-95ff-185f185e0004" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_EG_ddc591de-1c5b-41ea-b15a-35c0285deadd" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_EG"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_188e3888-e259-45f5-98c7-b8780185a15c" xlink:to="loc_country_EG_ddc591de-1c5b-41ea-b15a-35c0285deadd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_OtherAfricaMember_988eaaa8-ac03-45c7-a4cc-fb23ab4333c2" xlink:href="wab-20241231.xsd#wab_OtherAfricaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_188e3888-e259-45f5-98c7-b8780185a15c" xlink:to="loc_wab_OtherAfricaMember_988eaaa8-ac03-45c7-a4cc-fb23ab4333c2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_fc8efa78-5205-40d6-ba22-e5441fa7ac2c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_12fcf3da-fbcc-4775-8808-bc1b67e1b468" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_fc8efa78-5205-40d6-ba22-e5441fa7ac2c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_db6d1684-d810-4420-a7a5-dc4be0abe9f3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_12fcf3da-fbcc-4775-8808-bc1b67e1b468" xlink:to="loc_us-gaap_NoncurrentAssets_db6d1684-d810-4420-a7a5-dc4be0abe9f3" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/SEGMENTINFORMATIONSummaryofSalesbyProductDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#SEGMENTINFORMATIONSummaryofSalesbyProductDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/SEGMENTINFORMATIONSummaryofSalesbyProductDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_2670a773-ec82-431c-b276-e6a9c9086fc4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_39fb7c69-691e-4396-9d34-26933f030199" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_2670a773-ec82-431c-b276-e6a9c9086fc4" xlink:to="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_39fb7c69-691e-4396-9d34-26933f030199" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_012c9643-6336-4aa4-adae-917d7a3d2567" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_39fb7c69-691e-4396-9d34-26933f030199" xlink:to="loc_srt_ProductOrServiceAxis_012c9643-6336-4aa4-adae-917d7a3d2567" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_012c9643-6336-4aa4-adae-917d7a3d2567_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_012c9643-6336-4aa4-adae-917d7a3d2567" xlink:to="loc_srt_ProductsAndServicesDomain_012c9643-6336-4aa4-adae-917d7a3d2567_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_3f0a3680-6897-4df4-aa41-3b329b64d9ab" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_012c9643-6336-4aa4-adae-917d7a3d2567" xlink:to="loc_srt_ProductsAndServicesDomain_3f0a3680-6897-4df4-aa41-3b329b64d9ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceMember_f388ff09-017f-44f2-818d-4b50c8889f95" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3f0a3680-6897-4df4-aa41-3b329b64d9ab" xlink:to="loc_us-gaap_ServiceMember_f388ff09-017f-44f2-818d-4b50c8889f95" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquipmentMember_0f55cd55-a5bc-4aa5-b8cc-1017c56e7aa7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3f0a3680-6897-4df4-aa41-3b329b64d9ab" xlink:to="loc_us-gaap_EquipmentMember_0f55cd55-a5bc-4aa5-b8cc-1017c56e7aa7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_ComponentsMember_9ed6f3be-77fc-4bf7-ae49-bfed7edf43b9" xlink:href="wab-20241231.xsd#wab_ComponentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3f0a3680-6897-4df4-aa41-3b329b64d9ab" xlink:to="loc_wab_ComponentsMember_9ed6f3be-77fc-4bf7-ae49-bfed7edf43b9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_DigitalIntelligenceMember_45a7fd1f-445a-486d-a766-7a3b4b3f0e07" xlink:href="wab-20241231.xsd#wab_DigitalIntelligenceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3f0a3680-6897-4df4-aa41-3b329b64d9ab" xlink:to="loc_wab_DigitalIntelligenceMember_45a7fd1f-445a-486d-a766-7a3b4b3f0e07" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_OEMMember_63df1e3e-4d28-4ad3-8ece-ab42280693d2" xlink:href="wab-20241231.xsd#wab_OEMMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3f0a3680-6897-4df4-aa41-3b329b64d9ab" xlink:to="loc_wab_OEMMember_63df1e3e-4d28-4ad3-8ece-ab42280693d2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_AftermarketMember_effd06a7-7a76-421c-92d8-dc0394113226" xlink:href="wab-20241231.xsd#wab_AftermarketMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3f0a3680-6897-4df4-aa41-3b329b64d9ab" xlink:to="loc_wab_AftermarketMember_effd06a7-7a76-421c-92d8-dc0394113226" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_648617e8-2d80-4558-bdae-8d2afb13bbe8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_39fb7c69-691e-4396-9d34-26933f030199" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_648617e8-2d80-4558-bdae-8d2afb13bbe8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_648617e8-2d80-4558-bdae-8d2afb13bbe8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_648617e8-2d80-4558-bdae-8d2afb13bbe8" xlink:to="loc_us-gaap_SegmentDomain_648617e8-2d80-4558-bdae-8d2afb13bbe8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_e8df349e-ca81-4d26-a6b3-b133b525b1e9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_648617e8-2d80-4558-bdae-8d2afb13bbe8" xlink:to="loc_us-gaap_SegmentDomain_e8df349e-ca81-4d26-a6b3-b133b525b1e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_FreightSegmentMember_c4a38ada-d002-417f-8121-869df8ebf44a" xlink:href="wab-20241231.xsd#wab_FreightSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e8df349e-ca81-4d26-a6b3-b133b525b1e9" xlink:to="loc_wab_FreightSegmentMember_c4a38ada-d002-417f-8121-869df8ebf44a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_TransitSegmentMember_dfaa1656-5917-4e61-a7eb-ee7e52c43830" xlink:href="wab-20241231.xsd#wab_TransitSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e8df349e-ca81-4d26-a6b3-b133b525b1e9" xlink:to="loc_wab_TransitSegmentMember_dfaa1656-5917-4e61-a7eb-ee7e52c43830" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_ab25dacf-b92e-4f2f-8b7c-91ce14a95825" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_2670a773-ec82-431c-b276-e6a9c9086fc4" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_ab25dacf-b92e-4f2f-8b7c-91ce14a95825" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/OTHERINCOMENETNarrativeDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#OTHERINCOMENETNarrativeDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/OTHERINCOMENETNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_1a97883a-1d84-4174-92c2-010bcbad64fc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4eb7f613-c472-40ac-bd65-035594e4e274" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_1a97883a-1d84-4174-92c2-010bcbad64fc" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4eb7f613-c472-40ac-bd65-035594e4e274" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_fe2c6952-e030-4143-bc37-36e66e66364b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4eb7f613-c472-40ac-bd65-035594e4e274" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_fe2c6952-e030-4143-bc37-36e66e66364b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fe2c6952-e030-4143-bc37-36e66e66364b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_fe2c6952-e030-4143-bc37-36e66e66364b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fe2c6952-e030-4143-bc37-36e66e66364b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0d53f85e-f9ab-412c-8d74-7cfb71bdf515" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_fe2c6952-e030-4143-bc37-36e66e66364b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0d53f85e-f9ab-412c-8d74-7cfb71bdf515" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_LokomotivKurastyruZauytyLKZMember_d7df8820-2449-4267-844f-1f788e44b827" xlink:href="wab-20241231.xsd#wab_LokomotivKurastyruZauytyLKZMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0d53f85e-f9ab-412c-8d74-7cfb71bdf515" xlink:to="loc_wab_LokomotivKurastyruZauytyLKZMember_d7df8820-2449-4267-844f-1f788e44b827" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain_155e6d96-6d55-4c49-a66a-9fe057d29d70" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_1a97883a-1d84-4174-92c2-010bcbad64fc" xlink:to="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain_155e6d96-6d55-4c49-a66a-9fe057d29d70" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/RESTRUCTURINGNarrativeDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#RESTRUCTURINGNarrativeDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/RESTRUCTURINGNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_90c57d50-61e6-4f64-8234-e1100962a8b4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_bd08dc88-ae13-4f21-9a86-b14a5a88e18b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_90c57d50-61e6-4f64-8234-e1100962a8b4" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_bd08dc88-ae13-4f21-9a86-b14a5a88e18b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_0a799566-40bd-46a3-b260-a0423ead9597" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_bd08dc88-ae13-4f21-9a86-b14a5a88e18b" xlink:to="loc_us-gaap_RestructuringPlanAxis_0a799566-40bd-46a3-b260-a0423ead9597" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_0a799566-40bd-46a3-b260-a0423ead9597_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_0a799566-40bd-46a3-b260-a0423ead9597" xlink:to="loc_us-gaap_RestructuringPlanDomain_0a799566-40bd-46a3-b260-a0423ead9597_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_f9f5d86d-1b9c-43bd-b8a4-476d9130585e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_0a799566-40bd-46a3-b260-a0423ead9597" xlink:to="loc_us-gaap_RestructuringPlanDomain_f9f5d86d-1b9c-43bd-b8a4-476d9130585e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_Integration20Member_8aaa231c-c19e-4f87-812d-525dbe88a69f" xlink:href="wab-20241231.xsd#wab_Integration20Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_f9f5d86d-1b9c-43bd-b8a4-476d9130585e" xlink:to="loc_wab_Integration20Member_8aaa231c-c19e-4f87-812d-525dbe88a69f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_PortfolioOptimizationMember_cc605ba3-f2ad-4bd7-85d8-b00eb3df46c7" xlink:href="wab-20241231.xsd#wab_PortfolioOptimizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_f9f5d86d-1b9c-43bd-b8a4-476d9130585e" xlink:to="loc_wab_PortfolioOptimizationMember_cc605ba3-f2ad-4bd7-85d8-b00eb3df46c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_fe58cec7-4024-4d11-949f-998bea21d68c" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_bd08dc88-ae13-4f21-9a86-b14a5a88e18b" xlink:to="loc_srt_RangeAxis_fe58cec7-4024-4d11-949f-998bea21d68c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_fe58cec7-4024-4d11-949f-998bea21d68c_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_fe58cec7-4024-4d11-949f-998bea21d68c" xlink:to="loc_srt_RangeMember_fe58cec7-4024-4d11-949f-998bea21d68c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_bf40f120-c270-4849-8b3f-c37cb1ca37d0" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_fe58cec7-4024-4d11-949f-998bea21d68c" xlink:to="loc_srt_RangeMember_bf40f120-c270-4849-8b3f-c37cb1ca37d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_0fa26f38-cde9-4859-862a-cb970977a09c" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_bf40f120-c270-4849-8b3f-c37cb1ca37d0" xlink:to="loc_srt_MaximumMember_0fa26f38-cde9-4859-862a-cb970977a09c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_4bb3fe7b-1d19-4e19-bcb0-2f48381b8214" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_bd08dc88-ae13-4f21-9a86-b14a5a88e18b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_4bb3fe7b-1d19-4e19-bcb0-2f48381b8214" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_4bb3fe7b-1d19-4e19-bcb0-2f48381b8214_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_4bb3fe7b-1d19-4e19-bcb0-2f48381b8214" xlink:to="loc_us-gaap_SegmentDomain_4bb3fe7b-1d19-4e19-bcb0-2f48381b8214_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_b048472e-6863-4781-9ddc-ae387acac73a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_4bb3fe7b-1d19-4e19-bcb0-2f48381b8214" xlink:to="loc_us-gaap_SegmentDomain_b048472e-6863-4781-9ddc-ae387acac73a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_TransitSegmentMember_b508b389-960b-4755-8e54-bf14f471c2d9" xlink:href="wab-20241231.xsd#wab_TransitSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b048472e-6863-4781-9ddc-ae387acac73a" xlink:to="loc_wab_TransitSegmentMember_b508b389-960b-4755-8e54-bf14f471c2d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_FreightSegmentMember_9ae7cc9a-6b72-4678-a529-d373ce8104ed" xlink:href="wab-20241231.xsd#wab_FreightSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b048472e-6863-4781-9ddc-ae387acac73a" xlink:to="loc_wab_FreightSegmentMember_9ae7cc9a-6b72-4678-a529-d373ce8104ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_19972b6e-303f-47fe-8995-9b08b5f7f0e5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringAndRelatedCostExpectedCost1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_90c57d50-61e6-4f64-8234-e1100962a8b4" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_19972b6e-303f-47fe-8995-9b08b5f7f0e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_a0d58e02-175f-4bdb-ab76-99c4ef9aefca" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_90c57d50-61e6-4f64-8234-e1100962a8b4" xlink:to="loc_us-gaap_RestructuringCharges_a0d58e02-175f-4bdb-ab76-99c4ef9aefca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_f0734479-eb11-4dc1-b7dd-96217785027f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_90c57d50-61e6-4f64-8234-e1100962a8b4" xlink:to="loc_us-gaap_PaymentsForRestructuring_f0734479-eb11-4dc1-b7dd-96217785027f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/RESTRUCTURINGScheduleofRestructuringChargesDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#RESTRUCTURINGScheduleofRestructuringChargesDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/RESTRUCTURINGScheduleofRestructuringChargesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_bb6617ce-f946-46cb-b4a0-9179584b8c0f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_7ce7fbea-686f-47d8-b346-046f4ac5341b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_bb6617ce-f946-46cb-b4a0-9179584b8c0f" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_7ce7fbea-686f-47d8-b346-046f4ac5341b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_d3648e5e-120d-4e70-8de1-d7e19861f3d2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_7ce7fbea-686f-47d8-b346-046f4ac5341b" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_d3648e5e-120d-4e70-8de1-d7e19861f3d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_d3648e5e-120d-4e70-8de1-d7e19861f3d2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_d3648e5e-120d-4e70-8de1-d7e19861f3d2" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_d3648e5e-120d-4e70-8de1-d7e19861f3d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_d56c6969-f9bb-468e-9ba0-dd4261a4fe31" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_d3648e5e-120d-4e70-8de1-d7e19861f3d2" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_d56c6969-f9bb-468e-9ba0-dd4261a4fe31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_cf6600fa-1b66-4b7b-bec7-f9ddd22afd96" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_d56c6969-f9bb-468e-9ba0-dd4261a4fe31" xlink:to="loc_us-gaap_CostOfSalesMember_cf6600fa-1b66-4b7b-bec7-f9ddd22afd96" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_3a4e13f8-5a7e-4349-bf4f-573734243b92" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_d56c6969-f9bb-468e-9ba0-dd4261a4fe31" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_3a4e13f8-5a7e-4349-bf4f-573734243b92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIncomeMember_1ed3f0f4-672a-47aa-9c27-95a272210344" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_d56c6969-f9bb-468e-9ba0-dd4261a4fe31" xlink:to="loc_us-gaap_OtherIncomeMember_1ed3f0f4-672a-47aa-9c27-95a272210344" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_AmortizationExpenseMember_6432efe9-2365-4111-9bf0-e25cacc1d79c" xlink:href="wab-20241231.xsd#wab_AmortizationExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_d56c6969-f9bb-468e-9ba0-dd4261a4fe31" xlink:to="loc_wab_AmortizationExpenseMember_6432efe9-2365-4111-9bf0-e25cacc1d79c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_9ea5341a-197e-4343-8ba7-f981450e7092" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_7ce7fbea-686f-47d8-b346-046f4ac5341b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_9ea5341a-197e-4343-8ba7-f981450e7092" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_9ea5341a-197e-4343-8ba7-f981450e7092_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_9ea5341a-197e-4343-8ba7-f981450e7092" xlink:to="loc_us-gaap_SegmentDomain_9ea5341a-197e-4343-8ba7-f981450e7092_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_0bb2566f-3a1b-4b46-9c76-1982e5faeca5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_9ea5341a-197e-4343-8ba7-f981450e7092" xlink:to="loc_us-gaap_SegmentDomain_0bb2566f-3a1b-4b46-9c76-1982e5faeca5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_FreightSegmentMember_28dbc41c-0d2a-4dac-8468-d781991aeb7c" xlink:href="wab-20241231.xsd#wab_FreightSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0bb2566f-3a1b-4b46-9c76-1982e5faeca5" xlink:to="loc_wab_FreightSegmentMember_28dbc41c-0d2a-4dac-8468-d781991aeb7c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_TransitSegmentMember_fafcae37-eb43-4953-98b1-074ead75822b" xlink:href="wab-20241231.xsd#wab_TransitSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0bb2566f-3a1b-4b46-9c76-1982e5faeca5" xlink:to="loc_wab_TransitSegmentMember_fafcae37-eb43-4953-98b1-074ead75822b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_678c7383-3a4c-4dfc-90b4-06417984993f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_bb6617ce-f946-46cb-b4a0-9179584b8c0f" xlink:to="loc_us-gaap_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_678c7383-3a4c-4dfc-90b4-06417984993f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_cfe2dea3-63d0-4512-815d-2da6735fe382" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_bb6617ce-f946-46cb-b4a0-9179584b8c0f" xlink:to="loc_us-gaap_RestructuringCharges_cfe2dea3-63d0-4512-815d-2da6735fe382" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/SUBSEQUENTEVENTSDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#SUBSEQUENTEVENTSDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/SUBSEQUENTEVENTSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_39f836bf-81f7-4e66-901d-fc02f46d95e6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_8cb1bde0-c419-4c69-b40e-19d478d06f0b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_39f836bf-81f7-4e66-901d-fc02f46d95e6" xlink:to="loc_us-gaap_SubsequentEventTable_8cb1bde0-c419-4c69-b40e-19d478d06f0b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_7c3f2419-4125-4a40-bf67-d802f80a045b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_8cb1bde0-c419-4c69-b40e-19d478d06f0b" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_7c3f2419-4125-4a40-bf67-d802f80a045b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_7c3f2419-4125-4a40-bf67-d802f80a045b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_7c3f2419-4125-4a40-bf67-d802f80a045b" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_7c3f2419-4125-4a40-bf67-d802f80a045b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_a0663329-5b96-4d00-9b73-f8dbedce5de9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_7c3f2419-4125-4a40-bf67-d802f80a045b" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_a0663329-5b96-4d00-9b73-f8dbedce5de9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_061bb183-fdf1-405a-87f8-31fb8c58c2b6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_a0663329-5b96-4d00-9b73-f8dbedce5de9" xlink:to="loc_us-gaap_SubsequentEventMember_061bb183-fdf1-405a-87f8-31fb8c58c2b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_db7efd40-1468-4887-af67-f95ec03bf42d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_8cb1bde0-c419-4c69-b40e-19d478d06f0b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_db7efd40-1468-4887-af67-f95ec03bf42d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_db7efd40-1468-4887-af67-f95ec03bf42d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_db7efd40-1468-4887-af67-f95ec03bf42d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_db7efd40-1468-4887-af67-f95ec03bf42d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0d1de778-c1a5-47ea-a308-ba9696c15c0e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_db7efd40-1468-4887-af67-f95ec03bf42d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0d1de778-c1a5-47ea-a308-ba9696c15c0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_InspectionTechnologiesMember_e9cac514-1774-4b89-8929-c9c67257f002" xlink:href="wab-20241231.xsd#wab_InspectionTechnologiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0d1de778-c1a5-47ea-a308-ba9696c15c0e" xlink:to="loc_wab_InspectionTechnologiesMember_e9cac514-1774-4b89-8929-c9c67257f002" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_f2508b2e-0ddc-4781-a9d1-c1cc1175cc8b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_39f836bf-81f7-4e66-901d-fc02f46d95e6" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_f2508b2e-0ddc-4781-a9d1-c1cc1175cc8b" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://wabtec.com/role/SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTSDetails" xlink:type="simple" xlink:href="wab-20241231.xsd#SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTSDetails"/>
  <link:definitionLink xlink:role="http://wabtec.com/role/SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_4b88bbc4-75fa-42f8-905a-0ffa06fa92e8" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ValuationAndQualifyingAccountsDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_c906b4a1-e1c8-47f6-833b-280033160ffb" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ValuationAndQualifyingAccountsDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_4b88bbc4-75fa-42f8-905a-0ffa06fa92e8" xlink:to="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_c906b4a1-e1c8-47f6-833b-280033160ffb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_bb724918-99dc-4517-a030-9640ab3f649f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_c906b4a1-e1c8-47f6-833b-280033160ffb" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_bb724918-99dc-4517-a030-9640ab3f649f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_bb724918-99dc-4517-a030-9640ab3f649f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_bb724918-99dc-4517-a030-9640ab3f649f" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_bb724918-99dc-4517-a030-9640ab3f649f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_e3ceb174-d0ec-4a1d-83e7-4aec9bd079de" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_bb724918-99dc-4517-a030-9640ab3f649f" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_e3ceb174-d0ec-4a1d-83e7-4aec9bd079de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForCreditLossMember_efc649e6-3c20-4164-aee5-ea9353c2e655" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AllowanceForCreditLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_e3ceb174-d0ec-4a1d-83e7-4aec9bd079de" xlink:to="loc_us-gaap_AllowanceForCreditLossMember_efc649e6-3c20-4164-aee5-ea9353c2e655" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceTaxCreditCarryforwardMember_52b4fadf-72c1-4a62-b8b5-9a84c5288d87" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ValuationAllowanceTaxCreditCarryforwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_e3ceb174-d0ec-4a1d-83e7-4aec9bd079de" xlink:to="loc_us-gaap_ValuationAllowanceTaxCreditCarryforwardMember_52b4fadf-72c1-4a62-b8b5-9a84c5288d87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_9245a0f8-d1ac-4cf8-bcec-a74c901dc58d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_MovementInValuationAllowancesAndReservesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_4b88bbc4-75fa-42f8-905a-0ffa06fa92e8" xlink:to="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_9245a0f8-d1ac-4cf8-bcec-a74c901dc58d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_72b97767-0b9f-4a15-9ec0-38e0c7c0a174" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_9245a0f8-d1ac-4cf8-bcec-a74c901dc58d" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesBalance_72b97767-0b9f-4a15-9ec0-38e0c7c0a174" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_f26e78e2-6799-4b30-aabe-cbeeea8177eb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_9245a0f8-d1ac-4cf8-bcec-a74c901dc58d" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_f26e78e2-6799-4b30-aabe-cbeeea8177eb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts_2418be95-8326-4e21-8f88-34f04f09bdcd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_9245a0f8-d1ac-4cf8-bcec-a74c901dc58d" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts_2418be95-8326-4e21-8f88-34f04f09bdcd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDeductions_febad3ea-149b-4f19-ab91-0d79c324b64f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ValuationAllowancesAndReservesDeductions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_9245a0f8-d1ac-4cf8-bcec-a74c901dc58d" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDeductions_febad3ea-149b-4f19-ab91-0d79c324b64f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_aadd0dba-11e7-4525-b14c-de3e03652f62" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-roles-2024.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_AccountsPayableCurrent" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherAccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets" xlink:type="arc" order="691"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2024/ecd-2024.xsd#IndividualsOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllIndividualsMember" xlink:href="https://xbrl.sec.gov/ecd/2024/ecd-2024.xsd#ecd_AllIndividualsMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_wab_RafaelSantanaMember_9bdd9576-783e-421a-9e56-3826cade271f" xlink:href="wab-20241231.xsd#wab_RafaelSantanaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_wab_RafaelSantanaMember_9bdd9576-783e-421a-9e56-3826cade271f" xlink:type="arc" order="2"/>
  </link:definitionLink>
</link:linkbase>
