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    <link:label id="lab_us-gaap_SecuredDebtMember_575F2B119796EAE91C4FAFF2BFB43B99_terseLabel_en-US" xlink:label="lab_us-gaap_SecuredDebtMember_930C214976415432839C2D2EECDA3BE7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Receivables Facility [Member]</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentLineItems_AE3C2432FEAB490F000AAFF2BFB48F16_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_03ACC563F8BA54E0859149AFBC9C2DFC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
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    <link:label id="lab_us-gaap_SecuredDebt_3EEC95B035B9E8907D5AAFF2BFB4C214_terseLabel_en-US" xlink:label="lab_us-gaap_SecuredDebt_194CC34B18C55F50A2C2D48D31E8C70F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Secured Debt</link:label>
    <link:label id="lab_us-gaap_SecuredDebt_3EEC95B035B9E8907D5AAFF2BFB4C214_label_en-US" xlink:label="lab_us-gaap_SecuredDebt_194CC34B18C55F50A2C2D48D31E8C70F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Secured Debt</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_D804BFF692325C84047AAFF2BFB47722_verboseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_5BE7F366CA5C549F8360F285558C5C57" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Receivables facility debt available but not utilized</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount" xlink:label="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_5BE7F366CA5C549F8360F285558C5C57" xlink:type="locator" />
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    <link:label id="lab_trs_ReceivablesFacililtyDebtAggregateCosts_CA7EA0954EA6395DEC1BAFF2BFB4868D_label_en-US" xlink:label="lab_trs_ReceivablesFacililtyDebtAggregateCosts_72A3F32F2FAC522E8E0F64EA8D8A34B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receivables Facililty, Debt Aggregate Costs</link:label>
    <link:label id="lab_trs_ReceivablesFacililtyDebtAggregateCosts_CA7EA0954EA6395DEC1BAFF2BFB4868D_documentation_en-US" xlink:label="lab_trs_ReceivablesFacililtyDebtAggregateCosts_72A3F32F2FAC522E8E0F64EA8D8A34B9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of the fee that accompanies borrowing money under the debt instrument.</link:label>
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    <link:label id="lab_trs_AverageliquidationperiodReceivablespool_6603CE9BE43675490628AFF2BFB40F67_documentation_en-US" xlink:label="lab_trs_AverageliquidationperiodReceivablespool_EC5BE3DF234C52559B81D70A14B28F2C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Average liquidation period, Receivables pool</link:label>
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    <link:label id="lab_trs_AverageDiscountRateReceivablesFacility_66E4599FB2B82FB4A0C5AFF2BFB435F9_terseLabel_en-US" xlink:label="lab_trs_AverageDiscountRateReceivablesFacility_F008B18EDF9652F28F8FF63B808F5333" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Average discount rate, Receivables facility</link:label>
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    <link:label id="lab_us-gaap_InterestPaidNet_DDD69E9F52A481D18CD9F33FA1BF1E9E_label_en-US" xlink:label="lab_us-gaap_InterestPaidNet_0DAAC0B0E5075162864D527B5388D125" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Paid, Excluding Capitalized Interest, Operating Activities</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsOfFinancingCosts" xlink:label="loc_us-gaap_PaymentsOfFinancingCosts_3B437402ADC35AE1B2519AF2A4794FC9" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases" xlink:label="loc_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_B571416CA9FDBFE411B059F8689BCE0C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_FB17D1D52C4590359D1E59F8689CCC08_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_FB17D1D52C4590359D1E59F8689CCC08" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_FB17D1D52C4590359D1E59F8689CCC08_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_FB17D1D52C4590359D1E59F8689CCC08" 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/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_FB17D1D52C4590359D1E59F8689CCC08" xlink:type="locator" />
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    <link:label id="lab_trs_IncrementalDebtCommitmentsCapacity_B703588E52235BDEAD9459F8689CBCC7_terseLabel_en-US" xlink:label="lab_trs_IncrementalDebtCommitmentsCapacity_B703588E52235BDEAD9459F8689CBCC7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Incremental debt commitments capacity</link:label>
    <link:label id="lab_trs_IncrementalDebtCommitmentsCapacity_B703588E52235BDEAD9459F8689CBCC7_label_en-US" xlink:label="lab_trs_IncrementalDebtCommitmentsCapacity_B703588E52235BDEAD9459F8689CBCC7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Incremental debt commitments capacity</link:label>
    <link:label id="lab_trs_IncrementalDebtCommitmentsCapacity_B703588E52235BDEAD9459F8689CBCC7_documentation_en-US" xlink:label="lab_trs_IncrementalDebtCommitmentsCapacity_B703588E52235BDEAD9459F8689CBCC7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Incremental debt commitments capacity.</link:label>
    <link:loc xlink:href="trs-20190331.xsd#trs_IncrementalDebtCommitmentsCapacity" xlink:label="loc_trs_IncrementalDebtCommitmentsCapacity_B703588E52235BDEAD9459F8689CBCC7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_IncrementalDebtCommitmentsCapacity_B703588E52235BDEAD9459F8689CBCC7" xlink:to="lab_trs_IncrementalDebtCommitmentsCapacity_B703588E52235BDEAD9459F8689CBCC7" xlink:type="arc" />
    <link:label id="lab_trs_NetLeverageRatio_65B18B8C2088BAC2A79D59F8689CCEAA_terseLabel_en-US" xlink:label="lab_trs_NetLeverageRatio_65B18B8C2088BAC2A79D59F8689CCEAA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net leverage ratio</link:label>
    <link:label id="lab_trs_NetLeverageRatio_65B18B8C2088BAC2A79D59F8689CCEAA_label_en-US" xlink:label="lab_trs_NetLeverageRatio_65B18B8C2088BAC2A79D59F8689CCEAA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net leverage ratio</link:label>
    <link:label id="lab_trs_NetLeverageRatio_65B18B8C2088BAC2A79D59F8689CCEAA_documentation_en-US" xlink:label="lab_trs_NetLeverageRatio_65B18B8C2088BAC2A79D59F8689CCEAA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Net leverage ratio, as defined</link:label>
    <link:loc xlink:href="trs-20190331.xsd#trs_NetLeverageRatio" xlink:label="loc_trs_NetLeverageRatio_65B18B8C2088BAC2A79D59F8689CCEAA" xlink:type="locator" />
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    <link:label id="lab_trs_LetterOfCreditMaximumBorrowingCapacity_F2D1A7C9F718CBC4EB7759F8689D323B_terseLabel_en-US" xlink:label="lab_trs_LetterOfCreditMaximumBorrowingCapacity_F2D1A7C9F718CBC4EB7759F8689D323B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of Credit, Maximum Borrowing Capacity</link:label>
    <link:label id="lab_trs_LetterOfCreditMaximumBorrowingCapacity_F2D1A7C9F718CBC4EB7759F8689D323B_label_en-US" xlink:label="lab_trs_LetterOfCreditMaximumBorrowingCapacity_F2D1A7C9F718CBC4EB7759F8689D323B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letter of Credit, Maximum Borrowing Capacity</link:label>
    <link:label id="lab_trs_LetterOfCreditMaximumBorrowingCapacity_F2D1A7C9F718CBC4EB7759F8689D323B_documentation_en-US" xlink:label="lab_trs_LetterOfCreditMaximumBorrowingCapacity_F2D1A7C9F718CBC4EB7759F8689D323B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maximum borrowing capacity under the letters of credit.</link:label>
    <link:loc xlink:href="trs-20190331.xsd#trs_LetterOfCreditMaximumBorrowingCapacity" xlink:label="loc_trs_LetterOfCreditMaximumBorrowingCapacity_F2D1A7C9F718CBC4EB7759F8689D323B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCredit_E0301A1C70526924EC6A59F8689DBC72_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCredit_E0301A1C70526924EC6A59F8689DBC72" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving Credit Facility, Amount Outstanding</link:label>
    <link:label id="lab_us-gaap_LineOfCredit_E0301A1C70526924EC6A59F8689DBC72_label_en-US" xlink:label="lab_us-gaap_LineOfCredit_E0301A1C70526924EC6A59F8689DBC72" 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_B798071693DBED4A344259F8689D1102_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_B798071693DBED4A344259F8689D1102" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving Credit Facility, Remaining Borrowing Capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_B798071693DBED4A344259F8689D1102_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_B798071693DBED4A344259F8689D1102" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Remaining Borrowing Capacity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_B798071693DBED4A344259F8689D1102" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_B798071693DBED4A344259F8689D1102" xlink:to="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_B798071693DBED4A344259F8689D1102" xlink:type="arc" />
    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_F8B7781946E2A6014F7059F8689D43AE_terseLabel_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_F8B7781946E2A6014F7059F8689D43AE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of Credit Outstanding, Amount</link:label>
    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_F8B7781946E2A6014F7059F8689D43AE_label_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_F8B7781946E2A6014F7059F8689D43AE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letters of Credit Outstanding, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_F8B7781946E2A6014F7059F8689D43AE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LettersOfCreditOutstandingAmount_F8B7781946E2A6014F7059F8689D43AE" xlink:to="lab_us-gaap_LettersOfCreditOutstandingAmount_F8B7781946E2A6014F7059F8689D43AE" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_8425381B16BD79737C9859F8689D2A61_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_8425381B16BD79737C9859F8689D2A61" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Unused Borrowing Capacity, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount" xlink:label="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_8425381B16BD79737C9859F8689D2A61" xlink:type="locator" />
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    <link:label id="lab_trs_LongTermDebtFairValueOfParValue_118F37F674863A346E6C59F8689DE252_terseLabel_en-US" xlink:label="lab_trs_LongTermDebtFairValueOfParValue_118F37F674863A346E6C59F8689DE252" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Debt, Fair Value, % of par value</link:label>
    <link:label id="lab_trs_LongTermDebtFairValueOfParValue_118F37F674863A346E6C59F8689DE252_label_en-US" xlink:label="lab_trs_LongTermDebtFairValueOfParValue_118F37F674863A346E6C59F8689DE252" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Fair Value, % of par value</link:label>
    <link:label id="lab_trs_LongTermDebtFairValueOfParValue_118F37F674863A346E6C59F8689DE252_documentation_en-US" xlink:label="lab_trs_LongTermDebtFairValueOfParValue_118F37F674863A346E6C59F8689DE252" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The fair value of long-term debt presented as a % of par value.</link:label>
    <link:loc xlink:href="trs-20190331.xsd#trs_LongTermDebtFairValueOfParValue" xlink:label="loc_trs_LongTermDebtFairValueOfParValue_118F37F674863A346E6C59F8689DE252" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_LongTermDebtFairValueOfParValue_118F37F674863A346E6C59F8689DE252" xlink:to="lab_trs_LongTermDebtFairValueOfParValue_118F37F674863A346E6C59F8689DE252" xlink:type="arc" />
    <link:label id="lab_trs_StatementOfComprehensiveIncomeAbstract_79367CD996BE634C9D0759F869A4BD3E_label_en-US" xlink:label="lab_trs_StatementOfComprehensiveIncomeAbstract_79367CD996BE634C9D0759F869A4BD3E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Comprehensive Income [Abstract]</link:label>
    <link:label id="lab_trs_StatementOfComprehensiveIncomeAbstract_79367CD996BE634C9D0759F869A4BD3E_documentation_en-US" xlink:label="lab_trs_StatementOfComprehensiveIncomeAbstract_79367CD996BE634C9D0759F869A4BD3E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Statement of Comprehensive Income [Abstract]</link:label>
    <link:loc xlink:href="trs-20190331.xsd#trs_StatementOfComprehensiveIncomeAbstract" xlink:label="loc_trs_StatementOfComprehensiveIncomeAbstract_79367CD996BE634C9D0759F869A4BD3E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProfitLoss_403C5468AF0352C4F7C559F869A4EED9_terseLabel_en-US" xlink:label="lab_us-gaap_ProfitLoss_403C5468AF0352C4F7C559F869A4EED9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net Income</link:label>
    <link:label id="lab_us-gaap_ProfitLoss_403C5468AF0352C4F7C559F869A4EED9_label_en-US" xlink:label="lab_us-gaap_ProfitLoss_403C5468AF0352C4F7C559F869A4EED9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss), Including Portion Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_403C5468AF0352C4F7C559F869A4EED9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProfitLoss_403C5468AF0352C4F7C559F869A4EED9" xlink:to="lab_us-gaap_ProfitLoss_403C5468AF0352C4F7C559F869A4EED9" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_E35C60512BFFA9CB631F59F869A5A055_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_E35C60512BFFA9CB631F59F869A5A055" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other comprehensive income</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_E35C60512BFFA9CB631F59F869A5A055_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_E35C60512BFFA9CB631F59F869A5A055" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Net of Tax [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_E35C60512BFFA9CB631F59F869A5A055" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax_AB58DA9F055CA40E53B759F869A5A21C_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax_AB58DA9F055CA40E53B759F869A5A21C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Defined benefit plans</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax_AB58DA9F055CA40E53B759F869A5A21C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain_0C6C10BD844FDD227F86AFF2BFE482B7_label_en-US" xlink:label="lab_us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain_35E3299DF15D57C2A25F1116081B3E5F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Domain]</link:label>
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    <link:label id="lab_us-gaap_DeferredCompensationShareBasedPaymentsMember_840C7A2F28A844599574AFF2BFE46F20_label_en-US" xlink:label="lab_us-gaap_DeferredCompensationShareBasedPaymentsMember_5E84F8082F2E5766B614087E84CFEC3D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Compensation, Share-based Payments [Member]</link:label>
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    <link:label id="lab_trs_MetricTypeAxis_C29EECE19401F1AEDF0BAFF2BFE463A4_label_en-US" xlink:label="lab_trs_MetricTypeAxis_0818996716BA5C2299C27CB57D9E5904" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Metric Type [Axis]</link:label>
    <link:label id="lab_trs_MetricTypeAxis_C29EECE19401F1AEDF0BAFF2BFE463A4_documentation_en-US" xlink:label="lab_trs_MetricTypeAxis_0818996716BA5C2299C27CB57D9E5904" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Types of financial metrics.</link:label>
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    <link:label id="lab_trs_MetricTypeDomain_6F2CA2586AE1047E21E6AFF2BFE465F4_terseLabel_en-US" xlink:label="lab_trs_MetricTypeDomain_C94E2903E42F5B57AF224CC5A7E17C3A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Metric Type [Domain]</link:label>
    <link:label id="lab_trs_MetricTypeDomain_6F2CA2586AE1047E21E6AFF2BFE465F4_label_en-US" xlink:label="lab_trs_MetricTypeDomain_C94E2903E42F5B57AF224CC5A7E17C3A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Metric Type [Domain]</link:label>
    <link:label id="lab_trs_MetricTypeDomain_6F2CA2586AE1047E21E6AFF2BFE465F4_documentation_en-US" xlink:label="lab_trs_MetricTypeDomain_C94E2903E42F5B57AF224CC5A7E17C3A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Type of financial metric.</link:label>
    <link:loc xlink:href="trs-20190331.xsd#trs_MetricTypeDomain" xlink:label="loc_trs_MetricTypeDomain_C94E2903E42F5B57AF224CC5A7E17C3A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_MetricTypeDomain_C94E2903E42F5B57AF224CC5A7E17C3A" xlink:to="lab_trs_MetricTypeDomain_C94E2903E42F5B57AF224CC5A7E17C3A" xlink:type="arc" />
    <link:label id="lab_trs_A3YearEpsCagrMetricMember_13F5B857EA653CBEFD7DAFF2BFE4F1D9_terseLabel_en-US" xlink:label="lab_trs_A3YearEpsCagrMetricMember_73F454A861565B8EAEA827390CDEE119" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3 year EPS CAGR metric [Member]</link:label>
    <link:label id="lab_trs_A3YearEpsCagrMetricMember_13F5B857EA653CBEFD7DAFF2BFE4F1D9_label_en-US" xlink:label="lab_trs_A3YearEpsCagrMetricMember_73F454A861565B8EAEA827390CDEE119" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">3 year EPS CAGR metric [Member]</link:label>
    <link:label id="lab_trs_A3YearEpsCagrMetricMember_13F5B857EA653CBEFD7DAFF2BFE4F1D9_documentation_en-US" xlink:label="lab_trs_A3YearEpsCagrMetricMember_73F454A861565B8EAEA827390CDEE119" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financial metric based on earnings per share (EPS) cumulative average growth rate ("EPS CAGR") over the performance period.</link:label>
    <link:loc xlink:href="trs-20190331.xsd#trs_A3YearEpsCagrMetricMember" xlink:label="loc_trs_A3YearEpsCagrMetricMember_73F454A861565B8EAEA827390CDEE119" xlink:type="locator" />
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    <link:label id="lab_trs_TotalshareholderreturnmetricMember_6D1D29986B7DD054F683AFF2BFE4A62D_terseLabel_en-US" xlink:label="lab_trs_TotalshareholderreturnmetricMember_9D008AFCF73A539190898442D21C610E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total shareholder return metric [Member]</link:label>
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    <link:label id="lab_trs_TotalshareholderreturnmetricMember_6D1D29986B7DD054F683AFF2BFE4A62D_documentation_en-US" xlink:label="lab_trs_TotalshareholderreturnmetricMember_9D008AFCF73A539190898442D21C610E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The Company's total shareholder return (TSR) relative to the TSR of the common stock of a pre-defined industry peer-group measured over a specified period of time [Member]</link:label>
    <link:loc xlink:href="trs-20190331.xsd#trs_TotalshareholderreturnmetricMember" xlink:label="loc_trs_TotalshareholderreturnmetricMember_9D008AFCF73A539190898442D21C610E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PlanNameAxis_E56DA1F3D12485DB0CC1AFF2BFF45E1B_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameAxis_D75111B98FDA54939B5439B66E9B0810" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan Name [Axis]</link:label>
    <link:label id="lab_us-gaap_PlanNameAxis_E56DA1F3D12485DB0CC1AFF2BFF45E1B_label_en-US" xlink:label="lab_us-gaap_PlanNameAxis_D75111B98FDA54939B5439B66E9B0810" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan Name [Axis]</link:label>
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    <link:label id="lab_us-gaap_PlanNameDomain_C5159110FC4A7E0BDB62AFF2BFF46883_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameDomain_6CD6CC9411535187B1DC9E6E0601AFAD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan Name [Domain]</link:label>
    <link:label id="lab_us-gaap_PlanNameDomain_C5159110FC4A7E0BDB62AFF2BFF46883_label_en-US" xlink:label="lab_us-gaap_PlanNameDomain_6CD6CC9411535187B1DC9E6E0601AFAD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan Name [Domain]</link:label>
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    <link:label id="lab_trs_Plan1Member_34BBF424AF413874FEA8AFF2BFF44F40_terseLabel_en-US" xlink:label="lab_trs_Plan1Member_C21FA36F15A355599199CC5328AF1712" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan 1 [Member]</link:label>
    <link:label id="lab_trs_Plan1Member_34BBF424AF413874FEA8AFF2BFF44F40_label_en-US" xlink:label="lab_trs_Plan1Member_C21FA36F15A355599199CC5328AF1712" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan 1 [Member]</link:label>
    <link:label id="lab_trs_Plan1Member_34BBF424AF413874FEA8AFF2BFF44F40_documentation_en-US" xlink:label="lab_trs_Plan1Member_C21FA36F15A355599199CC5328AF1712" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Equity-based compensation arrangement plan.</link:label>
    <link:loc xlink:href="trs-20190331.xsd#trs_Plan1Member" xlink:label="loc_trs_Plan1Member_C21FA36F15A355599199CC5328AF1712" xlink:type="locator" />
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    <link:label id="lab_trs_Plan2Member_A1E72A027F0A1397A60FAFF2BFF4D04C_terseLabel_en-US" xlink:label="lab_trs_Plan2Member_B7A8D759C9D559E7A0E1D729A04F5576" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan 2 [Member]</link:label>
    <link:label id="lab_trs_Plan2Member_A1E72A027F0A1397A60FAFF2BFF4D04C_label_en-US" xlink:label="lab_trs_Plan2Member_B7A8D759C9D559E7A0E1D729A04F5576" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan 2 [Member]</link:label>
    <link:label id="lab_trs_Plan2Member_A1E72A027F0A1397A60FAFF2BFF4D04C_documentation_en-US" xlink:label="lab_trs_Plan2Member_B7A8D759C9D559E7A0E1D729A04F5576" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Equity-based compensation arrangement plan.</link:label>
    <link:loc xlink:href="trs-20190331.xsd#trs_Plan2Member" xlink:label="loc_trs_Plan2Member_B7A8D759C9D559E7A0E1D729A04F5576" xlink:type="locator" />
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    <link:label id="lab_trs_Plan3Member_0E0713693FA4D7B24F2AAFF2BFF47FA8_documentation_en-US" xlink:label="lab_trs_Plan3Member_9944A0B1C99C5FC4B8C3FFDCE13142B6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Equity-based compensation arrangement plan.</link:label>
    <link:loc xlink:href="trs-20190331.xsd#trs_Plan3Member" xlink:label="loc_trs_Plan3Member_9944A0B1C99C5FC4B8C3FFDCE13142B6" xlink:type="locator" />
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    <link:label id="lab_trs_Plan4Member_2BAE2A8B2310C747FF55AFF2BFF4402F_documentation_en-US" xlink:label="lab_trs_Plan4Member_2280067AC11B5104A4FC48A410191461" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Equity-based compensation arrangement plan.</link:label>
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    <link:label id="lab_trs_Plan5Member_9D0FBD619B266874A6A4AFF2BFF4A597_terseLabel_en-US" xlink:label="lab_trs_Plan5Member_A3621B21A56E5F09B5E17C152F850D27" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan 5 [Member]</link:label>
    <link:label id="lab_trs_Plan5Member_9D0FBD619B266874A6A4AFF2BFF4A597_label_en-US" xlink:label="lab_trs_Plan5Member_A3621B21A56E5F09B5E17C152F850D27" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan 5 [Member]</link:label>
    <link:label id="lab_trs_Plan5Member_9D0FBD619B266874A6A4AFF2BFF4A597_documentation_en-US" xlink:label="lab_trs_Plan5Member_A3621B21A56E5F09B5E17C152F850D27" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Equity-based compensation arrangement plan.</link:label>
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