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  <xs:element id="wab_PlanTwoThousandElevenAndTwoThousandMember" abstract="true" name="PlanTwoThousandElevenAndTwoThousandMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wab_PlanTwoThousandElevenMember" abstract="true" name="PlanTwoThousandElevenMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wab_NonEmployeeDirectorsFeeandStockOptionPlanMember" abstract="true" name="NonEmployeeDirectorsFeeandStockOptionPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wab_ShareBasedCompensationRelativeTotalStockholderReturnModifierPaymentPercentageIncrease" abstract="false" name="ShareBasedCompensationRelativeTotalStockholderReturnModifierPaymentPercentageIncrease" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="wab_ShareBasedCompensationRelativeTotalStockholderReturnModifierPaymentPercentageDecrease" abstract="false" name="ShareBasedCompensationRelativeTotalStockholderReturnModifierPaymentPercentageDecrease" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="wab_RestrictedStockAndUnitsMember" abstract="true" name="RestrictedStockAndUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberExpectedToVest" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberExpectedToVest" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="wab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNetPerformanceAdjustmentWeightedAverageNetPerformanceAdjustmentFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNetPerformanceAdjustmentWeightedAverageNetPerformanceAdjustmentFairValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="wab_NetIncomeLossAttributableToParentPercentAllocatedToNonVestedRestrictedStock" abstract="false" name="NetIncomeLossAttributableToParentPercentAllocatedToNonVestedRestrictedStock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="wab_AwardsExcludingRestrictedStockMember" abstract="true" name="AwardsExcludingRestrictedStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wab_EarningsPerShareBasicAndDilutedEPSAbstract" abstract="true" name="EarningsPerShareBasicAndDilutedEPSAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="wab_DenverTransitInstallationofConstantWirelessCrossingsMember" abstract="true" name="DenverTransitInstallationofConstantWirelessCrossingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wab_GrossMarginPercent" abstract="false" name="GrossMarginPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="wab_InterestExpenseAndOtherNet" abstract="false" name="InterestExpenseAndOtherNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wab_ComponentsMember" abstract="true" name="ComponentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wab_DigitalIntelligenceMember" abstract="true" name="DigitalIntelligenceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wab_OEMMember" abstract="true" name="OEMMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wab_AftermarketMember" abstract="true" name="AftermarketMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wab_PeriodicDefinedBenefitsExpenseReversalofExpenseExcludingInterestCostAndServiceCostComponent" abstract="false" name="PeriodicDefinedBenefitsExpenseReversalofExpenseExcludingInterestCostAndServiceCostComponent" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wab_Integration3.0Member" abstract="true" name="Integration3.0Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wab_PortfolioOptimizationMember" abstract="true" name="PortfolioOptimizationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wab_Integration20Member" abstract="true" name="Integration20Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
