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    <link:label id="lab_us-gaap_ReceivablesNetCurrent_C17CBC08BBF2B8146DE9DD32DCA0A6CD_label_en-US" xlink:label="lab_us-gaap_ReceivablesNetCurrent_C17CBC08BBF2B8146DE9DD32DCA0A6CD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receivables, Net, Current</link:label>
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    <link:label id="lab_us-gaap_InventoryNet_E62034E31B1C06E71000DD32DCA05B59_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_E62034E31B1C06E71000DD32DCA05B59" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inventories</link:label>
    <link:label id="lab_us-gaap_InventoryNet_E62034E31B1C06E71000DD32DCA05B59_label_en-US" xlink:label="lab_us-gaap_InventoryNet_E62034E31B1C06E71000DD32DCA05B59" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Net</link:label>
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    <link:label id="lab_us-gaap_OtherAssetsMiscellaneousCurrent_CB35E7827B82C0A9CFD7DD32DCA08B74_label_en-US" xlink:label="lab_us-gaap_OtherAssetsMiscellaneousCurrent_CB35E7827B82C0A9CFD7DD32DCA08B74" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Miscellaneous, Current</link:label>
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    <link:label id="lab_us-gaap_AssetsCurrent_EF8804705EF8D78D32C2DD32DCA00803_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_EF8804705EF8D78D32C2DD32DCA00803" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current assets</link:label>
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    <link:label id="lab_wab_BacklogIntellectualPropertyPatentsAndOtherMember_E5AA48AF25F646CF94C120CFC24B2C7D_terseLabel_en-US" xlink:label="lab_wab_BacklogIntellectualPropertyPatentsAndOtherMember_E5AA48AF25F646CF94C120CFC24B2C7D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Backlog, intellectual property, patents, non-compete and other intangibles</link:label>
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    <link:label id="lab_wab_ChangeinContractwithCustomerAssetRollForward_F7C661487CD64CF839E5DD32DB1BB99D_terseLabel_en-US" xlink:label="lab_wab_ChangeinContractwithCustomerAssetRollForward_F7C661487CD64CF839E5DD32DB1BB99D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contract Assets</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_9AE3D5E52B0B999A3CD743A10B884B53_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_9AE3D5E52B0B999A3CD743A10B884B53" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt instrument face amount</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentTerm_618479E1E00A3CEA3FA043A10B88D62F_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentTerm_618479E1E00A3CEA3FA043A10B88D62F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Term</link:label>
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    <link:label id="lab_us-gaap_DeferredFinanceCostsGross_6A4D9F32C8D9EF76966A43A10B8912C7_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredFinanceCostsGross_6A4D9F32C8D9EF76966A43A10B8912C7" 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_6A4D9F32C8D9EF76966A43A10B8912C7_label_en-US" xlink:label="lab_us-gaap_DeferredFinanceCostsGross_6A4D9F32C8D9EF76966A43A10B8912C7" 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_4D05DB04632BFBC5055843A10B8961CD_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_4D05DB04632BFBC5055843A10B8961CD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving credit facility, amount</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_4D05DB04632BFBC5055843A10B8961CD" xlink:type="locator" />
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    <link:label id="lab_wab_LineofCreditUncommittedAccordionFeature_99EC7A4E6D7E7EBA1A9443A10B8A2257_terseLabel_en-US" xlink:label="lab_wab_LineofCreditUncommittedAccordionFeature_99EC7A4E6D7E7EBA1A9443A10B8A2257" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Uncommitted accordion feature</link:label>
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    <link:label id="lab_wab_DebtInstrumentRestrictiveCovenantsUnrestrictedCashMaximum_E7FFC6037D08EF2D4EC543A10B8AD4AB_terseLabel_en-US" xlink:label="lab_wab_DebtInstrumentRestrictiveCovenantsUnrestrictedCashMaximum_E7FFC6037D08EF2D4EC543A10B8AD4AB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of credit subject to financial covenant restrictions</link:label>
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    <link:label id="lab_wab_DebtInstrumentRestrictiveCovenantsUnrestrictedCashMaximum_E7FFC6037D08EF2D4EC543A10B8AD4AB_documentation_en-US" xlink:label="lab_wab_DebtInstrumentRestrictiveCovenantsUnrestrictedCashMaximum_E7FFC6037D08EF2D4EC543A10B8AD4AB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Instrument, Restrictive Covenants, Unrestricted Cash, Maximum</link:label>
    <link:loc xlink:href="wab-20190630.xsd#wab_DebtInstrumentRestrictiveCovenantsUnrestrictedCashMaximum" xlink:label="loc_wab_DebtInstrumentRestrictiveCovenantsUnrestrictedCashMaximum_E7FFC6037D08EF2D4EC543A10B8AD4AB" xlink:type="locator" />
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    <link:label id="lab_wab_DebtInstrumentRestrictiveCovenantsEBITDAtoInterestExpenseRatioMinimum_2C42D77A045D230ABEF543A10B8AE9CB_terseLabel_en-US" xlink:label="lab_wab_DebtInstrumentRestrictiveCovenantsEBITDAtoInterestExpenseRatioMinimum_2C42D77A045D230ABEF543A10B8AE9CB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest Coverage ratio</link:label>
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    <link:label id="lab_wab_DebtInstrumentRestrictiveCovenantsLeverageRatioMaximum_757B80FDB9F9CA9A861F43A10B8A5AA2_terseLabel_en-US" xlink:label="lab_wab_DebtInstrumentRestrictiveCovenantsLeverageRatioMaximum_757B80FDB9F9CA9A861F43A10B8A5AA2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leverage ratio</link:label>
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    <link:loc xlink:href="wab-20190630.xsd#wab_DebtInstrumentRestrictiveCovenantsLeverageRatioThreeQuartersFollowingAcquisitionMaximum" xlink:label="loc_wab_DebtInstrumentRestrictiveCovenantsLeverageRatioThreeQuartersFollowingAcquisitionMaximum_10850F6DCA0568F00F4143A10B8A7369" xlink:type="locator" />
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    <link:label id="lab_wab_DebtInstrumentRestrictiveCovenantsLeverageRatioFourthandFifthQuarterFollowingAcquisitionMaximum_45734D9D90E79A445FAA43A10B8BA5B3_terseLabel_en-US" xlink:label="lab_wab_DebtInstrumentRestrictiveCovenantsLeverageRatioFourthandFifthQuarterFollowingAcquisitionMaximum_45734D9D90E79A445FAA43A10B8BA5B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restrictive covenants, leverage ratio</link:label>
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    <link:loc xlink:href="wab-20190630.xsd#wab_DebtInstrumentRestrictiveCovenantsLeverageRatioFourthandFifthQuarterFollowingAcquisitionMaximum" xlink:label="loc_wab_DebtInstrumentRestrictiveCovenantsLeverageRatioFourthandFifthQuarterFollowingAcquisitionMaximum_45734D9D90E79A445FAA43A10B8BA5B3" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeFixedInterestRate_07DCA3713960E260A3D143A10B8BB6C7_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFixedInterestRate_07DCA3713960E260A3D143A10B8BB6C7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest rate on notional value (as a percent)</link:label>
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    <link:label id="lab_us-gaap_DerivativeLiabilityNotionalAmount_A52BCBB42BA54679AE3643A10B8B518A_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityNotionalAmount_A52BCBB42BA54679AE3643A10B8B518A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Notional Amount</link:label>
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    <link:label id="lab_us-gaap_LineOfCreditFacilityExpirationPeriod_6F00853D4712B479A82143A10B8B1240_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityExpirationPeriod_6F00853D4712B479A82143A10B8B1240" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit facility loan term, years</link:label>
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    <link:label id="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_FE994D36DDAB33964E9D43A10B8B04AF_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_FE994D36DDAB33964E9D43A10B8B04AF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commitment fee</link:label>
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    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_ADF64F5FF911D64D0EEA20CFC2299906_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_ADF64F5FF911D64D0EEA20CFC2299906" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_ADF64F5FF911D64D0EEA20CFC2299906_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_ADF64F5FF911D64D0EEA20CFC2299906" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Payments, Due Year Three</link:label>
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    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_60E2086CCD6D5FAEFA7220CFC229ABFE_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_60E2086CCD6D5FAEFA7220CFC229ABFE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Payments, Due Year Four</link:label>
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    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_18342F59F2E7516A131C20CFC2290FC0_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_18342F59F2E7516A131C20CFC2290FC0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2023</link:label>
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    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_3C7CFB38BA611DD0F71820CFC22A5A10_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_3C7CFB38BA611DD0F71820CFC22A5A10" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
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    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_F76C490937EA2BECE88220CFC22A036C_totalLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_F76C490937EA2BECE88220CFC22A036C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total lease payments</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_F76C490937EA2BECE88220CFC22A036C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_F31D56D400160C3B5ABA20CFC22A0537_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_F31D56D400160C3B5ABA20CFC22A0537" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Less: Present value discount</link:label>
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    <link:label id="lab_us-gaap_FinanceLeaseLiability_49F5958228D57E3ABE3720CFC22A5034_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiability_49F5958228D57E3ABE3720CFC22A5034" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Present value lease liabilities</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiability_49F5958228D57E3ABE3720CFC22A5034_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiability_49F5958228D57E3ABE3720CFC22A5034" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiability" xlink:label="loc_us-gaap_FinanceLeaseLiability_49F5958228D57E3ABE3720CFC22A5034" xlink:type="locator" />
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    <link:label id="lab_wab_TotalPaymentsDueAbstract_CD09D05A533ED337877220CFC22AAA9F_terseLabel_en-US" xlink:label="lab_wab_TotalPaymentsDueAbstract_CD09D05A533ED337877220CFC22AAA9F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_wab_TotalPaymentsDueAbstract_CD09D05A533ED337877220CFC22AAA9F_label_en-US" xlink:label="lab_wab_TotalPaymentsDueAbstract_CD09D05A533ED337877220CFC22AAA9F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Total Payments Due [Abstract]</link:label>
    <link:label id="lab_wab_TotalPaymentsDueAbstract_CD09D05A533ED337877220CFC22AAA9F_documentation_en-US" xlink:label="lab_wab_TotalPaymentsDueAbstract_CD09D05A533ED337877220CFC22AAA9F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Total Payments Due [Abstract]</link:label>
    <link:loc xlink:href="wab-20190630.xsd#wab_TotalPaymentsDueAbstract" xlink:label="loc_wab_TotalPaymentsDueAbstract_CD09D05A533ED337877220CFC22AAA9F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wab_TotalPaymentsDueAbstract_CD09D05A533ED337877220CFC22AAA9F" xlink:to="lab_wab_TotalPaymentsDueAbstract_CD09D05A533ED337877220CFC22AAA9F" xlink:type="arc" />
    <link:label id="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsRemainderofFiscalYear_9C5608F0280011C8768C20CFC22AC02A_totalLabel_en-US" xlink:label="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsRemainderofFiscalYear_9C5608F0280011C8768C20CFC22AC02A" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Remaining 2019</link:label>
    <link:label id="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsRemainderofFiscalYear_9C5608F0280011C8768C20CFC22AC02A_label_en-US" xlink:label="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsRemainderofFiscalYear_9C5608F0280011C8768C20CFC22AC02A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating And Finance Lease, Liability, Total, Payments, Remainder of Fiscal Year</link:label>
    <link:label id="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsRemainderofFiscalYear_9C5608F0280011C8768C20CFC22AC02A_documentation_en-US" xlink:label="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsRemainderofFiscalYear_9C5608F0280011C8768C20CFC22AC02A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lessee, Operating And Finance Lease, Liability, Total, Payments, Remainder of Fiscal Year</link:label>
    <link:loc xlink:href="wab-20190630.xsd#wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsRemainderofFiscalYear" xlink:label="loc_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsRemainderofFiscalYear_9C5608F0280011C8768C20CFC22AC02A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsRemainderofFiscalYear_9C5608F0280011C8768C20CFC22AC02A" xlink:to="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsRemainderofFiscalYear_9C5608F0280011C8768C20CFC22AC02A" xlink:type="arc" />
    <link:label id="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearTwo_61D8D7555F849A803AED20CFC22BEC56_totalLabel_en-US" xlink:label="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearTwo_61D8D7555F849A803AED20CFC22BEC56" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
    <link:label id="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearTwo_61D8D7555F849A803AED20CFC22BEC56_label_en-US" xlink:label="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearTwo_61D8D7555F849A803AED20CFC22BEC56" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating And Finance Lease, Liability, Total Payments, Due Year Two</link:label>
    <link:label id="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearTwo_61D8D7555F849A803AED20CFC22BEC56_documentation_en-US" xlink:label="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearTwo_61D8D7555F849A803AED20CFC22BEC56" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lessee, Operating And Finance Lease, Liability, Total Payments, Due Year Two</link:label>
    <link:loc xlink:href="wab-20190630.xsd#wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearTwo" xlink:label="loc_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearTwo_61D8D7555F849A803AED20CFC22BEC56" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearTwo_61D8D7555F849A803AED20CFC22BEC56" xlink:to="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearTwo_61D8D7555F849A803AED20CFC22BEC56" xlink:type="arc" />
    <link:label id="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearThree_D8B4A8D5657C156F355520CFC22B4CDD_totalLabel_en-US" xlink:label="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearThree_D8B4A8D5657C156F355520CFC22B4CDD" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
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    <link:label id="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearThree_D8B4A8D5657C156F355520CFC22B4CDD_documentation_en-US" xlink:label="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearThree_D8B4A8D5657C156F355520CFC22B4CDD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lessee, Operating And Finance, Lease, Liability, Total, Payments, Due Year Three</link:label>
    <link:loc xlink:href="wab-20190630.xsd#wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearThree" xlink:label="loc_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearThree_D8B4A8D5657C156F355520CFC22B4CDD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearThree_D8B4A8D5657C156F355520CFC22B4CDD" xlink:to="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearThree_D8B4A8D5657C156F355520CFC22B4CDD" xlink:type="arc" />
    <link:label id="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearFour_A77E6C692BF3CAA69E8020CFC22BA4DF_totalLabel_en-US" xlink:label="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearFour_A77E6C692BF3CAA69E8020CFC22BA4DF" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">2022</link:label>
    <link:label id="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearFour_A77E6C692BF3CAA69E8020CFC22BA4DF_label_en-US" xlink:label="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearFour_A77E6C692BF3CAA69E8020CFC22BA4DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating And Finance Lease, Liability, Total Payments, Due Year Four</link:label>
    <link:label id="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearFour_A77E6C692BF3CAA69E8020CFC22BA4DF_documentation_en-US" xlink:label="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearFour_A77E6C692BF3CAA69E8020CFC22BA4DF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lessee, Operating And Finance Lease, Liability, Total Payments, Due Year Four</link:label>
    <link:loc xlink:href="wab-20190630.xsd#wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearFour" xlink:label="loc_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearFour_A77E6C692BF3CAA69E8020CFC22BA4DF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearFour_A77E6C692BF3CAA69E8020CFC22BA4DF" xlink:to="lab_wab_LesseeOperatingAndFinanceLeaseLiabilityTotalPaymentsDueYearFour_A77E6C692BF3CAA69E8020CFC22BA4DF" xlink:type="arc" />
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    <link:label id="lab_wab_FloatingRateNotesDue2021Member_FB300EE970BFCD2C75E3DD32DC81C353_terseLabel_en-US" xlink:label="lab_wab_FloatingRateNotesDue2021Member_FB300EE970BFCD2C75E3DD32DC81C353" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Floating Rate Notes 2021</link:label>
    <link:loc xlink:href="wab-20190630.xsd#wab_FloatingRateNotesDue2021Member" xlink:label="loc_wab_FloatingRateNotesDue2021Member_FB300EE970BFCD2C75E3DD32DC81C353" xlink:type="locator" />
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    <link:label id="lab_wab_A4.150PercentSeniorNotesDueTwentyThousandandTwentyFourMember_ADBEF1C9230D39A73BC1DD32DC81D5D5_terseLabel_en-US" xlink:label="lab_wab_A4.150PercentSeniorNotesDueTwentyThousandandTwentyFourMember_ADBEF1C9230D39A73BC1DD32DC81D5D5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4.15% Senior Notes</link:label>
    <link:label id="lab_wab_A4.150PercentSeniorNotesDueTwentyThousandandTwentyFourMember_ADBEF1C9230D39A73BC1DD32DC81D5D5_label_en-US" xlink:label="lab_wab_A4.150PercentSeniorNotesDueTwentyThousandandTwentyFourMember_ADBEF1C9230D39A73BC1DD32DC81D5D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">4.150 Percent Senior Notes Due Twenty Thousand and Twenty Four [Member]</link:label>
    <link:label id="lab_wab_A4.150PercentSeniorNotesDueTwentyThousandandTwentyFourMember_ADBEF1C9230D39A73BC1DD32DC81D5D5_documentation_en-US" xlink:label="lab_wab_A4.150PercentSeniorNotesDueTwentyThousandandTwentyFourMember_ADBEF1C9230D39A73BC1DD32DC81D5D5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">4.150 Percent Senior Notes Due Twenty Thousand and Twenty Four [Member]</link:label>
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    <link:label id="lab_wab_A4.70PercentSeniorNotesDueTwentyThousandandTwentySixMember_2EB3C81A1CF0F2263D92DD32DC8143DD_label_en-US" xlink:label="lab_wab_A4.70PercentSeniorNotesDueTwentyThousandandTwentySixMember_2EB3C81A1CF0F2263D92DD32DC8143DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">4.70 Percent Senior Notes Due Twenty Thousand and Twenty Six [Member]</link:label>
    <link:label id="lab_wab_A4.70PercentSeniorNotesDueTwentyThousandandTwentySixMember_2EB3C81A1CF0F2263D92DD32DC8143DD_documentation_en-US" xlink:label="lab_wab_A4.70PercentSeniorNotesDueTwentyThousandandTwentySixMember_2EB3C81A1CF0F2263D92DD32DC8143DD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">4.70 Percent Senior Notes Due Twenty Thousand and Twenty Six [Member]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_8B2DD8A3D6DBF302506BDD32DC81D989" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentFairValue_5B77AC4F59250B964367DD32DC811CFD_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFairValue_5B77AC4F59250B964367DD32DC811CFD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Fair Value Disclosure</link:label>
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    <link:label id="lab_us-gaap_ProductMember_948F2FB3CD8773FB22B7299E0947F102_terseLabel_en-US" xlink:label="lab_us-gaap_ProductMember_948F2FB3CD8773FB22B7299E0947F102" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goods</link:label>
    <link:label id="lab_us-gaap_ProductMember_948F2FB3CD8773FB22B7299E0947F102_label_en-US" xlink:label="lab_us-gaap_ProductMember_948F2FB3CD8773FB22B7299E0947F102" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Product [Member]</link:label>
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    <link:label id="lab_us-gaap_ServiceMember_F48D1FC15E94FF885D54299E094738B3_terseLabel_en-US" xlink:label="lab_us-gaap_ServiceMember_F48D1FC15E94FF885D54299E094738B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Services</link:label>
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    <link:label id="lab_wab_LesseeWeightedAverageDiscountRatePercent_807BCC153894919D33D0DD32DB24726A_label_en-US" xlink:label="lab_wab_LesseeWeightedAverageDiscountRatePercent_807BCC153894919D33D0DD32DB24726A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Weighted Average Discount Rate, Percent</link:label>
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    <link:label id="lab_us-gaap_SignificantAccountingPoliciesTextBlock_90ACBD60D3A4D2D2A431DD32DC142A8E_terseLabel_en-US" xlink:label="lab_us-gaap_SignificantAccountingPoliciesTextBlock_90ACBD60D3A4D2D2A431DD32DC142A8E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounting Policies</link:label>
    <link:label id="lab_us-gaap_SignificantAccountingPoliciesTextBlock_90ACBD60D3A4D2D2A431DD32DC142A8E_label_en-US" xlink:label="lab_us-gaap_SignificantAccountingPoliciesTextBlock_90ACBD60D3A4D2D2A431DD32DC142A8E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Significant Accounting Policies [Text Block]</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_42BBEBA6E206623D17AEDD32DC81BE4F_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_42BBEBA6E206623D17AEDD32DC81BE4F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Dividend yield (as a percent)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_42BBEBA6E206623D17AEDD32DC81BE4F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_E1796374123E2474CCF8DD32DC81CA23_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_E1796374123E2474CCF8DD32DC81CA23" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Risk-free interest rate (as a percent)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_222F1596552D9772E8C7DD32DC81909A" xlink:type="locator" />
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    <link:label id="lab_wab_EarningsPerShareNumeratorActivityAbstract_295CB19DFD6DD52B892945E506A71DDE_terseLabel_en-US" xlink:label="lab_wab_EarningsPerShareNumeratorActivityAbstract_295CB19DFD6DD52B892945E506A71DDE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Numerator</link:label>
    <link:label id="lab_wab_EarningsPerShareNumeratorActivityAbstract_295CB19DFD6DD52B892945E506A71DDE_label_en-US" xlink:label="lab_wab_EarningsPerShareNumeratorActivityAbstract_295CB19DFD6DD52B892945E506A71DDE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share Numerator Activity [Abstract]</link:label>
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    <link:label id="lab_us-gaap_DividendsCash_992767CAE9DB879EB51545E506A70C59_negatedLabel_en-US" xlink:label="lab_us-gaap_DividendsCash_992767CAE9DB879EB51545E506A70C59" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Less: dividends declared - common shares and non-vested restricted stock</link:label>
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    <link:label id="lab_us-gaap_UndistributedEarnings_32A3331420C8C2F295F245E506A73C52_totalLabel_en-US" xlink:label="lab_us-gaap_UndistributedEarnings_32A3331420C8C2F295F245E506A73C52" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Undistributed earnings</link:label>
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    <link:label id="lab_wab_PercentageOfNetIncomeAllocatedToCommonShareholders_F1054EE77A01934722D645E506A84305_terseLabel_en-US" xlink:label="lab_wab_PercentageOfNetIncomeAllocatedToCommonShareholders_F1054EE77A01934722D645E506A84305" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage allocated to common shareholders (as a percent)</link:label>
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    <link:label id="lab_us-gaap_PreferredStockDividendsAndOtherAdjustments_4A7957C505D02E0FA6BA45E506A84902_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockDividendsAndOtherAdjustments_4A7957C505D02E0FA6BA45E506A84902" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Dividends declared - preferred shares</link:label>
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    <link:label id="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_EF26BBA7B06E9BF9341545E506A8FE85_label_en-US" xlink:label="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_EF26BBA7B06E9BF9341545E506A8FE85" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Available to Common Stockholders, Basic</link:label>
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    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_3B28EF492F7FADB8844645E506A8364B_verboseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_3B28EF492F7FADB8844645E506A8364B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Basic weighted average common shares outstanding (in shares)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock_697B036B3207FF32580D45E506A8105D" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_15D79AD41A93797A50DB45E506A8ADD4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_A51D34331E7B1BD6C7E645E506A89B0F_totalLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_A51D34331E7B1BD6C7E645E506A89B0F" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Denominator for diluted earnings per common share - adjusted weighted average shares and assumed conversion (in shares)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_A51D34331E7B1BD6C7E645E506A89B0F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_EarningsPerShareBasicAndDilutedAbstract_771D083390AA8A87927145E506A8D98C_verboseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAndDilutedAbstract_771D083390AA8A87927145E506A8D98C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Net income attributable to Wabtec shareholders per common share</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasicAndDilutedAbstract" xlink:label="loc_us-gaap_EarningsPerShareBasicAndDilutedAbstract_771D083390AA8A87927145E506A8D98C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_EarningsPerShareBasic_E63309D1FE47FAB225D145E506A8ABF5_verboseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasic_E63309D1FE47FAB225D145E506A8ABF5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Basic (in dollars per share)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_E63309D1FE47FAB225D145E506A8ABF5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_EarningsPerShareDiluted_1B55BB269A99597A81A445E506A809EB_verboseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareDiluted_1B55BB269A99597A81A445E506A809EB" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Diluted (in dollars per share)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_1B55BB269A99597A81A445E506A809EB" xlink:type="locator" />
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    <link:label id="lab_wab_BasicWeightedAverageCommonSharesOutstandingAndNonVestedRestrictedStockExpectedToVest_A5EFFD173C450DBE4F1145E506A8809B_terseLabel_en-US" xlink:label="lab_wab_BasicWeightedAverageCommonSharesOutstandingAndNonVestedRestrictedStockExpectedToVest_A5EFFD173C450DBE4F1145E506A8809B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basic weighted-average common shares outstanding and non-vested restricted stock expected to vest (in shares)</link:label>
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    <link:label id="lab_wab_BasicWeightedAverageCommonSharesOutstandingAndNonVestedRestrictedStockExpectedToVest_A5EFFD173C450DBE4F1145E506A8809B_documentation_en-US" xlink:label="lab_wab_BasicWeightedAverageCommonSharesOutstandingAndNonVestedRestrictedStockExpectedToVest_A5EFFD173C450DBE4F1145E506A8809B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Basic weighted average common shares outstanding and non vested restricted stock expected to vest.</link:label>
    <link:loc xlink:href="wab-20190630.xsd#wab_BasicWeightedAverageCommonSharesOutstandingAndNonVestedRestrictedStockExpectedToVest" xlink:label="loc_wab_BasicWeightedAverageCommonSharesOutstandingAndNonVestedRestrictedStockExpectedToVest_A5EFFD173C450DBE4F1145E506A8809B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesGross_CCB6AFDC963E5A00BBB04491CBD8D2B1_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesGross_CCB6AFDC963E5A00BBB04491CBD8D2B1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total future consideration</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_0798C31C2F588346B31843C818B4D231_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_0798C31C2F588346B31843C818B4D231" 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_dei_EntityAddressStateOrProvince_A0AAC40B5458B431C57129A1D24EB711_terseLabel_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince_A0AAC40B5458B431C57129A1D24EB711" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Address, State or Province</link:label>
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    <link:label id="lab_dei_EntityCurrentReportingStatus_FD4CAE16335583B1C32B29A1D24ED6F8_terseLabel_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus_FD4CAE16335583B1C32B29A1D24ED6F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Current Reporting Status</link:label>
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    <link:label id="lab_dei_Security12bTitle_01AF9472BB70E408534529A1D24FCEF5_terseLabel_en-US" xlink:label="lab_dei_Security12bTitle_01AF9472BB70E408534529A1D24FCEF5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Title of 12(b) Security</link:label>
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