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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_130049CD59072BE53A6F6CA31A66CBB9_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_130049CD59072BE53A6F6CA31A66CBB9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Gross</link:label>
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    <link:label id="lab_us-gaap_NetIncomeLoss_B4D4786BEEEB771DEB7BBA7840D077B4_label_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_B4D4786BEEEB771DEB7BBA7840D077B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Attributable to Parent</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaap_EquityAbstract_961C08FA0A13CBB1EE27BA269FDAA5D2" xlink:type="locator" />
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax_5861E437341A1E9450E6BA269FDAEA22" xlink:to="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax_5861E437341A1E9450E6BA269FDAEA22" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax_71CB0207B475B9F8875BBA269FDAAE26_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax_71CB0207B475B9F8875BBA269FDAAE26" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrealized gain (loss) on interest rate swap contracts, net of tax of $1,338 and $1,540</link:label>
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    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax_505403ADA4EB719B2F65BA269FDBB29A_negatedLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax_505403ADA4EB719B2F65BA269FDBB29A" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Unrealized loss on pension and post-retirement benefit plans, net of tax of $19,532 and $20,832</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_09129C9195444712E451BA26A302052E" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_09129C9195444712E451BA26A302052E" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_A8B27FBD18FEA89FC10FBA26A30258EA_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_A8B27FBD18FEA89FC10FBA26A30258EA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrealized gain (loss) on foreign exchange contracts, net of tax ($14 in 2015, $45 in 2016 and $$1,763 in 2017)</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_A8B27FBD18FEA89FC10FBA26A30258EA" xlink:to="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_A8B27FBD18FEA89FC10FBA26A30258EA" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_F23A67215B7942694169BA26A302BBBD_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_F23A67215B7942694169BA26A302BBBD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrealized gain (loss) on interest rate swap contracts, net of tax ($444 in 2015, $230 in 2016, and $1,079 in 2017)</link:label>
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    <link:label id="lab_wab_DisclosureStockOptionActivityAbstract_C44EFB575B9C8E30AD736CA3176F9D86_label_en-US" xlink:label="lab_wab_DisclosureStockOptionActivityAbstract_C44EFB575B9C8E30AD736CA3176F9D86" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Stock Option Activity [Abstract]</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_C22C08976CEC23F94F326CA317701539_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_C22C08976CEC23F94F326CA317701539" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Options</link:label>
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    <link:label id="lab_wab_FutureMinimumPaymentsUnderNonCancelableOperatingLeasesWithInitialTermsOfOneYearOrMoreLineItems_9DE4BABB37CF22428C9868978EE0006E_label_en-US" xlink:label="lab_wab_FutureMinimumPaymentsUnderNonCancelableOperatingLeasesWithInitialTermsOfOneYearOrMoreLineItems_9DE4BABB37CF22428C9868978EE0006E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Future Minimum Payments Under Non Cancelable Operating Leases With Initial Terms Of One Year Or More [Line Items]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wab_FutureMinimumPaymentsUnderNonCancelableOperatingLeasesWithInitialTermsOfOneYearOrMoreLineItems_9DE4BABB37CF22428C9868978EE0006E" xlink:to="lab_wab_FutureMinimumPaymentsUnderNonCancelableOperatingLeasesWithInitialTermsOfOneYearOrMoreLineItems_9DE4BABB37CF22428C9868978EE0006E" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_69A81485359CAFCBA23D68978EE00659_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_69A81485359CAFCBA23D68978EE00659" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2018</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_69A81485359CAFCBA23D68978EE00659_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_69A81485359CAFCBA23D68978EE00659" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments Due, Next Twelve Months</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_69A81485359CAFCBA23D68978EE00659" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_69A81485359CAFCBA23D68978EE00659" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_69A81485359CAFCBA23D68978EE00659" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_502FD7DEDF536646969E68978EE0A7AE_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_502FD7DEDF536646969E68978EE0A7AE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_502FD7DEDF536646969E68978EE0A7AE_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_502FD7DEDF536646969E68978EE0A7AE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Two Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_502FD7DEDF536646969E68978EE0A7AE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_502FD7DEDF536646969E68978EE0A7AE" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_502FD7DEDF536646969E68978EE0A7AE" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_19204582145D6598EBBF68978EE06FDC_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_19204582145D6598EBBF68978EE06FDC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_19204582145D6598EBBF68978EE06FDC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_19204582145D6598EBBF68978EE06FDC" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_19204582145D6598EBBF68978EE06FDC" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_21BA8DEE7E8F8C88024368978EE01F68_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_21BA8DEE7E8F8C88024368978EE01F68" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_21BA8DEE7E8F8C88024368978EE01F68" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_21BA8DEE7E8F8C88024368978EE01F68" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_21BA8DEE7E8F8C88024368978EE01F68" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_00D6A225D0519F6D96E568978EE077E1_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_00D6A225D0519F6D96E568978EE077E1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_00D6A225D0519F6D96E568978EE077E1_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_00D6A225D0519F6D96E568978EE077E1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Five Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_00D6A225D0519F6D96E568978EE077E1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_00D6A225D0519F6D96E568978EE077E1" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_00D6A225D0519F6D96E568978EE077E1" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_A2C7FF15D4F86F90C68E68978EE13B89_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_A2C7FF15D4F86F90C68E68978EE13B89" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2023 and after</link:label>
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    <link:label id="lab_us-gaap_MultiemployerPlanContributionsByEmployer_0D897B5B924D62D07096BA74972A908E_terseLabel_en-US" xlink:label="lab_us-gaap_MultiemployerPlanContributionsByEmployer_0D897B5B924D62D07096BA74972A908E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contributions by the Company</link:label>
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    <link:label id="lab_us-gaap_MultiemployerPlansSurcharge_042B8B636BF27B93818EBA74972AE0F7_terseLabel_en-US" xlink:label="lab_us-gaap_MultiemployerPlansSurcharge_042B8B636BF27B93818EBA74972AE0F7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Surcharge Imposed</link:label>
    <link:label id="lab_us-gaap_MultiemployerPlansSurcharge_042B8B636BF27B93818EBA74972AE0F7_label_en-US" xlink:label="lab_us-gaap_MultiemployerPlansSurcharge_042B8B636BF27B93818EBA74972AE0F7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Multiemployer Plans, Surcharge</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MultiemployerPlansSurcharge" xlink:label="loc_us-gaap_MultiemployerPlansSurcharge_042B8B636BF27B93818EBA74972AE0F7" xlink:type="locator" />
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    <link:label id="lab_wab_DefinedContributionPlanPercentageOfContribution_89DAFD3A779911AA8640BA74972A28D4_terseLabel_en-US" xlink:label="lab_wab_DefinedContributionPlanPercentageOfContribution_89DAFD3A779911AA8640BA74972A28D4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contribution to the plan (as a percent)</link:label>
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    <link:label id="lab_wab_MultiemployerPlansSurchargeImposed_0D488B6BF47FE64EB931BA74972F9D0F_terseLabel_en-US" xlink:label="lab_wab_MultiemployerPlansSurchargeImposed_0D488B6BF47FE64EB931BA74972F9D0F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Surcharge imposed (as a percent)</link:label>
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    <link:label id="lab_wab_LeaseExpiration_7089380D5C57E5CC7551BA269FAEF2C3_terseLabel_en-US" xlink:label="lab_wab_LeaseExpiration_7089380D5C57E5CC7551BA269FAEF2C3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating leases term, in years</link:label>
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    <link:label id="lab_us-gaap_OperatingLeasesRentExpenseNet_1D393BCA76D1B4FF8C7FBA269FAED7E7_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesRentExpenseNet_1D393BCA76D1B4FF8C7FBA269FAED7E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net rental expense</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesRentExpenseNet_1D393BCA76D1B4FF8C7FBA269FAED7E7_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesRentExpenseNet_1D393BCA76D1B4FF8C7FBA269FAED7E7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Rent Expense, Net</link:label>
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    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_E1B4ACDB7DE1C365FCC6682DF23B695F_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_E1B4ACDB7DE1C365FCC6682DF23B695F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2018</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_E1B4ACDB7DE1C365FCC6682DF23B695F_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_E1B4ACDB7DE1C365FCC6682DF23B695F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months</link:label>
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    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_1DB9433C1B1B7F2D6478682DF23B63C1_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_1DB9433C1B1B7F2D6478682DF23B63C1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_1DB9433C1B1B7F2D6478682DF23B63C1" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_B23955F4599E0D6D918E682DF23BDA7D_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_B23955F4599E0D6D918E682DF23BDA7D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_530687B39D4770CDB8B4BA013AE94A6D_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_530687B39D4770CDB8B4BA013AE94A6D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentFaceAmount_530687B39D4770CDB8B4BA013AE94A6D" xlink:to="lab_us-gaap_DebtInstrumentFaceAmount_530687B39D4770CDB8B4BA013AE94A6D" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPricePercentage_0EF3D425825EE5A7B09ABA013AE9D04D_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPricePercentage_0EF3D425825EE5A7B09ABA013AE9D04D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt issuance face value (as a percent)</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPricePercentage_0EF3D425825EE5A7B09ABA013AE9D04D_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPricePercentage_0EF3D425825EE5A7B09ABA013AE9D04D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Redemption Price, Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_0EF3D425825EE5A7B09ABA013AE9D04D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DeferredFinanceCostsGross_63287A8D167A427B02A1BA013AE9A304_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredFinanceCostsGross_63287A8D167A427B02A1BA013AE9A304" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred financing cost</link:label>
    <link:label id="lab_us-gaap_DeferredFinanceCostsGross_63287A8D167A427B02A1BA013AE9A304_label_en-US" xlink:label="lab_us-gaap_DeferredFinanceCostsGross_63287A8D167A427B02A1BA013AE9A304" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Issuance Costs, Gross</link:label>
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    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_ED59CF2D4296A3DA7BE6BA013AE91B36_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_ED59CF2D4296A3DA7BE6BA013AE91B36" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving credit facility, amount</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_ED59CF2D4296A3DA7BE6BA013AE91B36_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_ED59CF2D4296A3DA7BE6BA013AE91B36" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_ED59CF2D4296A3DA7BE6BA013AE91B36" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityExpirationPeriod_54DF2075158DDB4E3CDABA013AE99766_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityExpirationPeriod_54DF2075158DDB4E3CDABA013AE99766" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit facility loan term, years</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityExpirationPeriod_54DF2075158DDB4E3CDABA013AE99766_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityExpirationPeriod_54DF2075158DDB4E3CDABA013AE99766" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Expiration Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityExpirationPeriod" xlink:label="loc_us-gaap_LineOfCreditFacilityExpirationPeriod_54DF2075158DDB4E3CDABA013AE99766" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCredit_B6EE8DE98C529346380FBA013AE9FF5A_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCredit_B6EE8DE98C529346380FBA013AE9FF5A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term line of credit</link:label>
    <link:label id="lab_us-gaap_LineOfCredit_B6EE8DE98C529346380FBA013AE9FF5A_label_en-US" xlink:label="lab_us-gaap_LineOfCredit_B6EE8DE98C529346380FBA013AE9FF5A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Line of Credit</link:label>
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    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_D917B189D23D591CE066BA013AE9E6F8_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_D917B189D23D591CE066BA013AE9E6F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of credit facility, amount currently available</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_D917B189D23D591CE066BA013AE9E6F8" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_9D72F749158954B0B739BA013AE9803B_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_9D72F749158954B0B739BA013AE9803B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commitment fee (as a percent)</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_9D72F749158954B0B739BA013AE9803B_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_9D72F749158954B0B739BA013AE9803B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Commitment Fee Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_9D72F749158954B0B739BA013AE9803B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_82A71C266EF3D83F9F87BA013AE94A7A_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_82A71C266EF3D83F9F87BA013AE94A7A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt instrument basis points spread on variable rate</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_82A71C266EF3D83F9F87BA013AE94A7A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_82A71C266EF3D83F9F87BA013AE94A7A" xlink:to="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_82A71C266EF3D83F9F87BA013AE94A7A" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebtPercentageBearingVariableInterestRate_72307143DE336F371B43BA013AE9A645_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtPercentageBearingVariableInterestRate_72307143DE336F371B43BA013AE9A645" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average interest rate (as a percent)</link:label>
    <link:label id="lab_us-gaap_LongTermDebtPercentageBearingVariableInterestRate_72307143DE336F371B43BA013AE9A645_label_en-US" xlink:label="lab_us-gaap_LongTermDebtPercentageBearingVariableInterestRate_72307143DE336F371B43BA013AE9A645" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebtPercentageBearingVariableInterestRate" xlink:label="loc_us-gaap_LongTermDebtPercentageBearingVariableInterestRate_72307143DE336F371B43BA013AE9A645" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeFixedInterestRate_9311343021A3092D46BABA013AE92072_label_en-US" xlink:label="lab_us-gaap_DerivativeFixedInterestRate_9311343021A3092D46BABA013AE92072" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Fixed Interest Rate</link:label>
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    <link:label id="lab_wab_MinimumInterestExpenseCoverageRatio_D55656DBF14AA9C0485ABA013AE9B8FA_terseLabel_en-US" xlink:label="lab_wab_MinimumInterestExpenseCoverageRatio_D55656DBF14AA9C0485ABA013AE9B8FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum interest expense coverage ratio</link:label>
    <link:label id="lab_wab_MinimumInterestExpenseCoverageRatio_D55656DBF14AA9C0485ABA013AE9B8FA_label_en-US" xlink:label="lab_wab_MinimumInterestExpenseCoverageRatio_D55656DBF14AA9C0485ABA013AE9B8FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum Interest Expense Coverage Ratio</link:label>
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    <link:loc xlink:href="wab-20171231.xsd#wab_MinimumInterestExpenseCoverageRatio" xlink:label="loc_wab_MinimumInterestExpenseCoverageRatio_D55656DBF14AA9C0485ABA013AE9B8FA" xlink:type="locator" />
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    <link:label id="lab_wab_MaximumDebtToCashFlowRatio_F57CEE215744A22E032ABA013AE94E43_terseLabel_en-US" xlink:label="lab_wab_MaximumDebtToCashFlowRatio_F57CEE215744A22E032ABA013AE94E43" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum debt to cash flow ratio</link:label>
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    <link:label id="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_B3BC8333BA2AA23F6D22BA013AE98235_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_B3BC8333BA2AA23F6D22BA013AE98235" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Liabilities assumed</link:label>
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    <link:label id="lab_wab_NumberofInvestors_1F976DE6E2BE4D8B4CB3BA013AE9648B_terseLabel_en-US" xlink:label="lab_wab_NumberofInvestors_1F976DE6E2BE4D8B4CB3BA013AE9648B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of investors</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_A690C27AF1183A700ABABA7841B3AB44_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_A690C27AF1183A700ABABA7841B3AB44" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment</link:label>
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    <link:label id="lab_us-gaap_LesseeLeasesPolicyTextBlock_C0B2CF8057EC1F4FDC7FBA7841B4F6DB_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeLeasesPolicyTextBlock_C0B2CF8057EC1F4FDC7FBA7841B4F6DB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leasing Arrangements</link:label>
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    <link:loc xlink:href="wab-20171231.xsd#wab_RecentAcquisitionsMember" xlink:label="loc_wab_RecentAcquisitionsMember_45F8C28937F2AE655B0BBA7841A4973B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis_E1951D4D54CFC27A623ABA7841A5A0DC_label_en-US" xlink:label="lab_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis_E1951D4D54CFC27A623ABA7841A5A0DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for Error Corrections [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis" xlink:label="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis_E1951D4D54CFC27A623ABA7841A5A0DC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AdjustmentsForErrorCorrectionDomain_A1E073428A1EA507B55ABA7841A5BD2A_label_en-US" xlink:label="lab_us-gaap_AdjustmentsForErrorCorrectionDomain_A1E073428A1EA507B55ABA7841A5BD2A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for Error Correction [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdjustmentsForErrorCorrectionDomain" xlink:label="loc_us-gaap_AdjustmentsForErrorCorrectionDomain_A1E073428A1EA507B55ABA7841A5BD2A" xlink:type="locator" />
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    <link:label id="lab_wab_FairValueofReceivablesMember_BC824D8E159E5CE82809BA7841A5FF12_terseLabel_en-US" xlink:label="lab_wab_FairValueofReceivablesMember_BC824D8E159E5CE82809BA7841A5FF12" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value of Receivables</link:label>
    <link:label id="lab_wab_FairValueofReceivablesMember_BC824D8E159E5CE82809BA7841A5FF12_label_en-US" xlink:label="lab_wab_FairValueofReceivablesMember_BC824D8E159E5CE82809BA7841A5FF12" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value of Receivables [Member]</link:label>
    <link:label id="lab_wab_FairValueofReceivablesMember_BC824D8E159E5CE82809BA7841A5FF12_documentation_en-US" xlink:label="lab_wab_FairValueofReceivablesMember_BC824D8E159E5CE82809BA7841A5FF12" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fair Value of Receivables [Member]</link:label>
    <link:loc xlink:href="wab-20171231.xsd#wab_FairValueofReceivablesMember" xlink:label="loc_wab_FairValueofReceivablesMember_BC824D8E159E5CE82809BA7841A5FF12" xlink:type="locator" />
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    <link:label id="lab_wab_FairValueofCurrentLiabilitiesMember_F1B2777B8D824EBDEE60BA7841A560D9_terseLabel_en-US" xlink:label="lab_wab_FairValueofCurrentLiabilitiesMember_F1B2777B8D824EBDEE60BA7841A560D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value of Current Liabilities</link:label>
    <link:label id="lab_wab_FairValueofCurrentLiabilitiesMember_F1B2777B8D824EBDEE60BA7841A560D9_label_en-US" xlink:label="lab_wab_FairValueofCurrentLiabilitiesMember_F1B2777B8D824EBDEE60BA7841A560D9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value of Current Liabilities [Member]</link:label>
    <link:label id="lab_wab_FairValueofCurrentLiabilitiesMember_F1B2777B8D824EBDEE60BA7841A560D9_documentation_en-US" xlink:label="lab_wab_FairValueofCurrentLiabilitiesMember_F1B2777B8D824EBDEE60BA7841A560D9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fair Value of Current Liabilities [Member]</link:label>
    <link:loc xlink:href="wab-20171231.xsd#wab_FairValueofCurrentLiabilitiesMember" xlink:label="loc_wab_FairValueofCurrentLiabilitiesMember_F1B2777B8D824EBDEE60BA7841A560D9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wab_FairValueofCurrentLiabilitiesMember_F1B2777B8D824EBDEE60BA7841A560D9" xlink:to="lab_wab_FairValueofCurrentLiabilitiesMember_F1B2777B8D824EBDEE60BA7841A560D9" xlink:type="arc" />
    <link:label id="lab_wab_FairValueofAssetsAcquiredandLiabilitiesAssumedMember_8DFCB7887425FE2DAB6DBA7841A55E60_terseLabel_en-US" xlink:label="lab_wab_FairValueofAssetsAcquiredandLiabilitiesAssumedMember_8DFCB7887425FE2DAB6DBA7841A55E60" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value of Assets Acquired and Liabilities Assumed</link:label>
    <link:label id="lab_wab_FairValueofAssetsAcquiredandLiabilitiesAssumedMember_8DFCB7887425FE2DAB6DBA7841A55E60_label_en-US" xlink:label="lab_wab_FairValueofAssetsAcquiredandLiabilitiesAssumedMember_8DFCB7887425FE2DAB6DBA7841A55E60" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value of Assets Acquired and Liabilities Assumed [Member]</link:label>
    <link:label id="lab_wab_FairValueofAssetsAcquiredandLiabilitiesAssumedMember_8DFCB7887425FE2DAB6DBA7841A55E60_documentation_en-US" xlink:label="lab_wab_FairValueofAssetsAcquiredandLiabilitiesAssumedMember_8DFCB7887425FE2DAB6DBA7841A55E60" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fair Value of Assets Acquired and Liabilities Assumed [Member]</link:label>
    <link:loc xlink:href="wab-20171231.xsd#wab_FairValueofAssetsAcquiredandLiabilitiesAssumedMember" xlink:label="loc_wab_FairValueofAssetsAcquiredandLiabilitiesAssumedMember_8DFCB7887425FE2DAB6DBA7841A55E60" xlink:type="locator" />
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    <link:label id="lab_us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod_DC6DE15F155F6567B847BA7841A55807_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod_DC6DE15F155F6567B847BA7841A55807" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Annual sales of Faiveley</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod_DC6DE15F155F6567B847BA7841A55807_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod_DC6DE15F155F6567B847BA7841A55807" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod" xlink:label="loc_us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod_DC6DE15F155F6567B847BA7841A55807" xlink:type="locator" />
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    <link:label id="lab_wab_BusinessCombinationNumberOfEmployees_B532CFECCD189A52EE87BA7841A5D028_terseLabel_en-US" xlink:label="lab_wab_BusinessCombinationNumberOfEmployees_B532CFECCD189A52EE87BA7841A5D028" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of employees (more than)</link:label>
    <link:label id="lab_wab_BusinessCombinationNumberOfEmployees_B532CFECCD189A52EE87BA7841A5D028_label_en-US" xlink:label="lab_wab_BusinessCombinationNumberOfEmployees_B532CFECCD189A52EE87BA7841A5D028" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Combination Number Of Employees</link:label>
    <link:label id="lab_wab_BusinessCombinationNumberOfEmployees_B532CFECCD189A52EE87BA7841A5D028_documentation_en-US" xlink:label="lab_wab_BusinessCombinationNumberOfEmployees_B532CFECCD189A52EE87BA7841A5D028" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Business combination number of employees.</link:label>
    <link:loc xlink:href="wab-20171231.xsd#wab_BusinessCombinationNumberOfEmployees" xlink:label="loc_wab_BusinessCombinationNumberOfEmployees_B532CFECCD189A52EE87BA7841A5D028" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wab_BusinessCombinationNumberOfEmployees_B532CFECCD189A52EE87BA7841A5D028" xlink:to="lab_wab_BusinessCombinationNumberOfEmployees_B532CFECCD189A52EE87BA7841A5D028" xlink:type="arc" />
    <link:label id="lab_wab_BusinessCombinationNumberOfCountries_8E2D106FA490DA93AC4BBA7841A524E2_terseLabel_en-US" xlink:label="lab_wab_BusinessCombinationNumberOfCountries_8E2D106FA490DA93AC4BBA7841A524E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of countries Faiveley operates in</link:label>
    <link:label id="lab_wab_BusinessCombinationNumberOfCountries_8E2D106FA490DA93AC4BBA7841A524E2_label_en-US" xlink:label="lab_wab_BusinessCombinationNumberOfCountries_8E2D106FA490DA93AC4BBA7841A524E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Combination Number Of Countries</link:label>
    <link:label id="lab_wab_BusinessCombinationNumberOfCountries_8E2D106FA490DA93AC4BBA7841A524E2_documentation_en-US" xlink:label="lab_wab_BusinessCombinationNumberOfCountries_8E2D106FA490DA93AC4BBA7841A524E2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Business combination number of countries.</link:label>
    <link:loc xlink:href="wab-20171231.xsd#wab_BusinessCombinationNumberOfCountries" xlink:label="loc_wab_BusinessCombinationNumberOfCountries_8E2D106FA490DA93AC4BBA7841A524E2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_BusinessAcquisitionSharePrice_9D1867C807C47DCFA790BA7841A594AE_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionSharePrice_9D1867C807C47DCFA790BA7841A594AE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchase price per share (in euros per share)</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionSharePrice_9D1867C807C47DCFA790BA7841A594AE_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionSharePrice_9D1867C807C47DCFA790BA7841A594AE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition, Share Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionSharePrice" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_9D1867C807C47DCFA790BA7841A594AE" xlink:type="locator" />
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    <link:label id="lab_wab_PercentageOfBusinessAcquisitionConsiderationPayableInCash_1C049C8F8D0AB0125E1ABA7841A5CE3D_terseLabel_en-US" xlink:label="lab_wab_PercentageOfBusinessAcquisitionConsiderationPayableInCash_1C049C8F8D0AB0125E1ABA7841A5CE3D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of business acquisition consideration payable in cash (as a percent)</link:label>
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    <link:label id="lab_wab_PercentageOfBusinessAcquisitionConsiderationPayableInCash_1C049C8F8D0AB0125E1ABA7841A5CE3D_documentation_en-US" xlink:label="lab_wab_PercentageOfBusinessAcquisitionConsiderationPayableInCash_1C049C8F8D0AB0125E1ABA7841A5CE3D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of business acquisition consideration payable in cash.</link:label>
    <link:loc xlink:href="wab-20171231.xsd#wab_PercentageOfBusinessAcquisitionConsiderationPayableInCash" xlink:label="loc_wab_PercentageOfBusinessAcquisitionConsiderationPayableInCash_1C049C8F8D0AB0125E1ABA7841A5CE3D" xlink:type="locator" />
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    <link:label id="lab_wab_BusinessAcquisitionPercentageofShareCapitalAcquired_A62CCABA8CEDD14C8AF9BA7841A61791_terseLabel_en-US" xlink:label="lab_wab_BusinessAcquisitionPercentageofShareCapitalAcquired_A62CCABA8CEDD14C8AF9BA7841A61791" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of share capital acquired (as a percent)</link:label>
    <link:label id="lab_wab_BusinessAcquisitionPercentageofShareCapitalAcquired_A62CCABA8CEDD14C8AF9BA7841A61791_label_en-US" xlink:label="lab_wab_BusinessAcquisitionPercentageofShareCapitalAcquired_A62CCABA8CEDD14C8AF9BA7841A61791" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition, Percentage of Share Capital Acquired</link:label>
    <link:label id="lab_wab_BusinessAcquisitionPercentageofShareCapitalAcquired_A62CCABA8CEDD14C8AF9BA7841A61791_documentation_en-US" xlink:label="lab_wab_BusinessAcquisitionPercentageofShareCapitalAcquired_A62CCABA8CEDD14C8AF9BA7841A61791" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Business Acquisition, Percentage of Share Capital Acquired</link:label>
    <link:loc xlink:href="wab-20171231.xsd#wab_BusinessAcquisitionPercentageofShareCapitalAcquired" xlink:label="loc_wab_BusinessAcquisitionPercentageofShareCapitalAcquired_A62CCABA8CEDD14C8AF9BA7841A61791" xlink:type="locator" />
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    <link:label id="lab_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_D5FA65A658A381F0F433BA7841A6D9BB_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_D5FA65A658A381F0F433BA7841A6D9BB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of voting interests in Faiveley (as a percent)</link:label>
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