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    <link:label id="lab_trs_SeniorSecuredTermLoanMember_3C3B9CDA2248C1B1B07E5206BE0764CC_terseLabel_en-US" xlink:label="lab_trs_SeniorSecuredTermLoanMember_3C3B9CDA2248C1B1B07E5206BE0764CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Senior Secured Term Loan A [Member]</link:label>
    <link:label id="lab_trs_SeniorSecuredTermLoanMember_3C3B9CDA2248C1B1B07E5206BE0764CC_label_en-US" xlink:label="lab_trs_SeniorSecuredTermLoanMember_3C3B9CDA2248C1B1B07E5206BE0764CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Secured Term Loan A [Member]</link:label>
    <link:label id="lab_trs_SeniorSecuredTermLoanMember_3C3B9CDA2248C1B1B07E5206BE0764CC_documentation_en-US" xlink:label="lab_trs_SeniorSecuredTermLoanMember_3C3B9CDA2248C1B1B07E5206BE0764CC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior Secured Term Loan A [Member]</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentAxis_3EAB352580326CD160D35206BE071A89_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_3EAB352580326CD160D35206BE071A89" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Axis]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentAxis_3EAB352580326CD160D35206BE071A89_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_3EAB352580326CD160D35206BE071A89" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_3EAB352580326CD160D35206BE071A89" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_66F539347E4706E26F2E5206BE075F81_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain_66F539347E4706E26F2E5206BE075F81" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Name [Domain]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_66F539347E4706E26F2E5206BE075F81_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain_66F539347E4706E26F2E5206BE075F81" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Name [Domain]</link:label>
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    <link:label id="lab_trs_A4.875SeniorUnsecuredNotesDue2025Member_9B7E05C5D5DE67E9D78C5206BE0794F6_terseLabel_en-US" xlink:label="lab_trs_A4.875SeniorUnsecuredNotesDue2025Member_9B7E05C5D5DE67E9D78C5206BE0794F6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4.875% Senior Unsecured Notes Due 2025 [Member]</link:label>
    <link:label id="lab_trs_A4.875SeniorUnsecuredNotesDue2025Member_9B7E05C5D5DE67E9D78C5206BE0794F6_label_en-US" xlink:label="lab_trs_A4.875SeniorUnsecuredNotesDue2025Member_9B7E05C5D5DE67E9D78C5206BE0794F6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">4.875% Senior Unsecured Notes Due 2025 [Member]</link:label>
    <link:label id="lab_trs_A4.875SeniorUnsecuredNotesDue2025Member_9B7E05C5D5DE67E9D78C5206BE0794F6_documentation_en-US" xlink:label="lab_trs_A4.875SeniorUnsecuredNotesDue2025Member_9B7E05C5D5DE67E9D78C5206BE0794F6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">4.875% Senior Unsecured Notes Due 2025 [Member]</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_D43A8FEFA166D8B738D95206BE0E3F1A_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_D43A8FEFA166D8B738D95206BE0E3F1A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">October 15, 2021 to October 14, 2022 [Member]</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_DebtInstrumentRedemptionPeriodThreeMember_D43A8FEFA166D8B738D95206BE0E3F1A" xlink:to="lab_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_D43A8FEFA166D8B738D95206BE0E3F1A" xlink:type="arc" />
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    <link:label id="lab_us-gaap_DebtInstrumentLineItems_C90E32BA1487114B34485206BE0E0210_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_C90E32BA1487114B34485206BE0E0210" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4FB3B5633529551634D2963DB415BA06_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4FB3B5633529551634D2963DB415BA06" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other financing activities</link:label>
    <link:label id="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4FB3B5633529551634D2963DB415BA06_label_en-US" xlink:label="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4FB3B5633529551634D2963DB415BA06" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from (Payments for) Other Financing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4FB3B5633529551634D2963DB415BA06" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4FB3B5633529551634D2963DB415BA06" xlink:to="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4FB3B5633529551634D2963DB415BA06" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_A551AAEFC2C7C1C10159963DB415AEE3_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_A551AAEFC2C7C1C10159963DB415AEE3" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used for financing activities of continuing operations</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_A551AAEFC2C7C1C10159963DB415AEE3_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_A551AAEFC2C7C1C10159963DB415AEE3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities, Continuing Operations</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_A551AAEFC2C7C1C10159963DB415AEE3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_A551AAEFC2C7C1C10159963DB415AEE3" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_A551AAEFC2C7C1C10159963DB415AEE3" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_EA34F6A2ED24593C9C26963DB41556DF_terseLabel_en-US" xlink:label="lab_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_EA34F6A2ED24593C9C26963DB41556DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by financing activities of discontinued operations</link:label>
    <link:label id="lab_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_EA34F6A2ED24593C9C26963DB41556DF_label_en-US" xlink:label="lab_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_EA34F6A2ED24593C9C26963DB41556DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Provided by (Used in) Financing Activities, Discontinued Operations</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_EA34F6A2ED24593C9C26963DB41556DF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_EA34F6A2ED24593C9C26963DB41556DF" xlink:to="lab_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_EA34F6A2ED24593C9C26963DB41556DF" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_56F1E01C25AFC5590687963DB416C841_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_56F1E01C25AFC5590687963DB416C841" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used for financing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_56F1E01C25AFC5590687963DB416C841_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_56F1E01C25AFC5590687963DB416C841" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_56F1E01C25AFC5590687963DB416C841" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_56F1E01C25AFC5590687963DB416C841" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_56F1E01C25AFC5590687963DB416C841" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_0F4DA3DDC7009AF6FE78963DB416CE11_totalLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_0F4DA3DDC7009AF6FE78963DB416CE11" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Decrease for the period</link:label>
    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_0F4DA3DDC7009AF6FE78963DB416CE11_label_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_0F4DA3DDC7009AF6FE78963DB416CE11" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_0F4DA3DDC7009AF6FE78963DB416CE11" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_0F4DA3DDC7009AF6FE78963DB416CE11" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_0F4DA3DDC7009AF6FE78963DB416CE11" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D170CCFB36C5C26FD047963DB4163DD7_periodStartLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D170CCFB36C5C26FD047963DB4163DD7" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">At beginning of period</link:label>
    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D170CCFB36C5C26FD047963DB4163DD7_label_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D170CCFB36C5C26FD047963DB4163DD7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D170CCFB36C5C26FD047963DB4163DD7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_7C593F31EF50F324C8CD963DB4164766_periodEndLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_7C593F31EF50F324C8CD963DB4164766" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">At end of period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_7C593F31EF50F324C8CD963DB4164766" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_95534A5DFE5147CEB38E963DB41611D5_terseLabel_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_95534A5DFE5147CEB38E963DB41611D5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Supplemental disclosure of cash flow information:</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_95534A5DFE5147CEB38E963DB41611D5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InterestPaidNet_13FCEEF68E972A6B8862963DB4160DA6_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPaidNet_13FCEEF68E972A6B8862963DB4160DA6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash paid for interest</link:label>
    <link:label id="lab_us-gaap_InterestPaidNet_13FCEEF68E972A6B8862963DB4160DA6_label_en-US" xlink:label="lab_us-gaap_InterestPaidNet_13FCEEF68E972A6B8862963DB4160DA6" 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>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestPaidNet" xlink:label="loc_us-gaap_InterestPaidNet_13FCEEF68E972A6B8862963DB4160DA6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncomeTaxesPaid_7A64EB4D9AD770FD1569963DB4177815_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaid_7A64EB4D9AD770FD1569963DB4177815" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash paid for taxes</link:label>
    <link:label id="lab_us-gaap_IncomeTaxesPaid_7A64EB4D9AD770FD1569963DB4177815_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaid_7A64EB4D9AD770FD1569963DB4177815" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Taxes Paid</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxesPaid" xlink:label="loc_us-gaap_IncomeTaxesPaid_7A64EB4D9AD770FD1569963DB4177815" xlink:type="locator" />
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    <link:label id="lab_trs_BankdebtandreceivablesfacilityMember_3BFCEB51A465BBDE940D95F2D85A2022_terseLabel_en-US" xlink:label="lab_trs_BankdebtandreceivablesfacilityMember_3BFCEB51A465BBDE940D95F2D85A2022" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">U.S. bank debt and receivables facility [Member]</link:label>
    <link:label id="lab_trs_BankdebtandreceivablesfacilityMember_3BFCEB51A465BBDE940D95F2D85A2022_label_en-US" xlink:label="lab_trs_BankdebtandreceivablesfacilityMember_3BFCEB51A465BBDE940D95F2D85A2022" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bank debt and receivables facility [Member]</link:label>
    <link:label id="lab_trs_BankdebtandreceivablesfacilityMember_3BFCEB51A465BBDE940D95F2D85A2022_documentation_en-US" xlink:label="lab_trs_BankdebtandreceivablesfacilityMember_3BFCEB51A465BBDE940D95F2D85A2022" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars, inside the reporting entity's home country; and, collateralized debt obligation backed by, for example, but not limited to, pledge, mortgage or other lien on the entity's assets.</link:label>
    <link:loc xlink:href="trs-20200630.xsd#trs_BankdebtandreceivablesfacilityMember" xlink:label="loc_trs_BankdebtandreceivablesfacilityMember_3BFCEB51A465BBDE940D95F2D85A2022" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_BankdebtandreceivablesfacilityMember_3BFCEB51A465BBDE940D95F2D85A2022" xlink:to="lab_trs_BankdebtandreceivablesfacilityMember_3BFCEB51A465BBDE940D95F2D85A2022" xlink:type="arc" />
    <link:label id="lab_trs_RevolvingCreditAndTermLoanFacilitiesMember_41ECC6E742B2DE73197F95F2D85A0789_terseLabel_en-US" xlink:label="lab_trs_RevolvingCreditAndTermLoanFacilitiesMember_41ECC6E742B2DE73197F95F2D85A0789" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving credit and term loan facilities [Member]</link:label>
    <link:label id="lab_trs_RevolvingCreditAndTermLoanFacilitiesMember_41ECC6E742B2DE73197F95F2D85A0789_label_en-US" xlink:label="lab_trs_RevolvingCreditAndTermLoanFacilitiesMember_41ECC6E742B2DE73197F95F2D85A0789" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revolving credit and term loan facilities [Member]</link:label>
    <link:label id="lab_trs_RevolvingCreditAndTermLoanFacilitiesMember_41ECC6E742B2DE73197F95F2D85A0789_documentation_en-US" xlink:label="lab_trs_RevolvingCreditAndTermLoanFacilitiesMember_41ECC6E742B2DE73197F95F2D85A0789" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt arrangement in which loan proceeds can continuously be obtained following repayments, but the total amount borrowed cannot exceed a specified maximum amount; as well as debt instruments with maturities ranging from five to ten years.</link:label>
    <link:loc xlink:href="trs-20200630.xsd#trs_RevolvingCreditAndTermLoanFacilitiesMember" xlink:label="loc_trs_RevolvingCreditAndTermLoanFacilitiesMember_41ECC6E742B2DE73197F95F2D85A0789" xlink:type="locator" />
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    <link:label id="lab_trs_TermloanAfacilityMember_36FBD40C80CE5C70BE8495F2D85C1F2B_terseLabel_en-US" xlink:label="lab_trs_TermloanAfacilityMember_36FBD40C80CE5C70BE8495F2D85C1F2B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">term loan A facility [Member]</link:label>
    <link:label id="lab_trs_TermloanAfacilityMember_36FBD40C80CE5C70BE8495F2D85C1F2B_label_en-US" xlink:label="lab_trs_TermloanAfacilityMember_36FBD40C80CE5C70BE8495F2D85C1F2B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">term loan A facility [Member]</link:label>
    <link:label id="lab_trs_TermloanAfacilityMember_36FBD40C80CE5C70BE8495F2D85C1F2B_documentation_en-US" xlink:label="lab_trs_TermloanAfacilityMember_36FBD40C80CE5C70BE8495F2D85C1F2B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">term loan A facility [Member]</link:label>
    <link:loc xlink:href="trs-20200630.xsd#trs_TermloanAfacilityMember" xlink:label="loc_trs_TermloanAfacilityMember_36FBD40C80CE5C70BE8495F2D85C1F2B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LetterOfCreditMember_4813916032F5C4DB98E595F2D85C60B5_terseLabel_en-US" xlink:label="lab_us-gaap_LetterOfCreditMember_4813916032F5C4DB98E595F2D85C60B5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of credit [Member]</link:label>
    <link:label id="lab_us-gaap_LetterOfCreditMember_4813916032F5C4DB98E595F2D85C60B5_label_en-US" xlink:label="lab_us-gaap_LetterOfCreditMember_4813916032F5C4DB98E595F2D85C60B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letter of Credit [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LetterOfCreditMember" xlink:label="loc_us-gaap_LetterOfCreditMember_4813916032F5C4DB98E595F2D85C60B5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_WriteOffOfDeferredDebtIssuanceCost_E06A7344FA8FA2A8A63F95F2D85E5B69_terseLabel_en-US" xlink:label="lab_us-gaap_WriteOffOfDeferredDebtIssuanceCost_E06A7344FA8FA2A8A63F95F2D85E5B69" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Write off of Deferred Debt Issuance Cost</link:label>
    <link:label id="lab_us-gaap_WriteOffOfDeferredDebtIssuanceCost_E06A7344FA8FA2A8A63F95F2D85E5B69_label_en-US" xlink:label="lab_us-gaap_WriteOffOfDeferredDebtIssuanceCost_E06A7344FA8FA2A8A63F95F2D85E5B69" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Write off of Deferred Debt Issuance Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_E06A7344FA8FA2A8A63F95F2D85E5B69" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_C4A38DD82578090E4CD195F2D85EF008_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_C4A38DD82578090E4CD195F2D85EF008" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving Credit Facility, Capacity Available for Foreign Revolver Loans</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_C4A38DD82578090E4CD195F2D85EF008_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_C4A38DD82578090E4CD195F2D85EF008" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases" xlink:label="loc_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_C4A38DD82578090E4CD195F2D85EF008" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_402CDDEF132B036395AE95F2D85E248B_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_402CDDEF132B036395AE95F2D85E248B" 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_402CDDEF132B036395AE95F2D85E248B_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_402CDDEF132B036395AE95F2D85E248B" 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/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_402CDDEF132B036395AE95F2D85E248B" xlink:type="locator" />
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    <link:label id="lab_trs_IncrementalDebtCommitmentsCapacity_5F95D4C25EE853FA552F95F2D85FF0D2_label_en-US" xlink:label="lab_trs_IncrementalDebtCommitmentsCapacity_5F95D4C25EE853FA552F95F2D85FF0D2" 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_5F95D4C25EE853FA552F95F2D85FF0D2_documentation_en-US" xlink:label="lab_trs_IncrementalDebtCommitmentsCapacity_5F95D4C25EE853FA552F95F2D85FF0D2" 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-20200630.xsd#trs_IncrementalDebtCommitmentsCapacity" xlink:label="loc_trs_IncrementalDebtCommitmentsCapacity_5F95D4C25EE853FA552F95F2D85FF0D2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_IncrementalDebtCommitmentsCapacity_5F95D4C25EE853FA552F95F2D85FF0D2" xlink:to="lab_trs_IncrementalDebtCommitmentsCapacity_5F95D4C25EE853FA552F95F2D85FF0D2" xlink:type="arc" />
    <link:label id="lab_trs_NetLeverageRatio_7D95FE4A0F6476EC9C5995F2D85F058D_terseLabel_en-US" xlink:label="lab_trs_NetLeverageRatio_7D95FE4A0F6476EC9C5995F2D85F058D" 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_7D95FE4A0F6476EC9C5995F2D85F058D_label_en-US" xlink:label="lab_trs_NetLeverageRatio_7D95FE4A0F6476EC9C5995F2D85F058D" 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_7D95FE4A0F6476EC9C5995F2D85F058D_documentation_en-US" xlink:label="lab_trs_NetLeverageRatio_7D95FE4A0F6476EC9C5995F2D85F058D" 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-20200630.xsd#trs_NetLeverageRatio" xlink:label="loc_trs_NetLeverageRatio_7D95FE4A0F6476EC9C5995F2D85F058D" xlink:type="locator" />
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    <link:label id="lab_trs_LetterOfCreditMaximumBorrowingCapacity_6BB664A42088C1CBA8CC95F2D85F4CBE_label_en-US" xlink:label="lab_trs_LetterOfCreditMaximumBorrowingCapacity_6BB664A42088C1CBA8CC95F2D85F4CBE" 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_6BB664A42088C1CBA8CC95F2D85F4CBE_documentation_en-US" xlink:label="lab_trs_LetterOfCreditMaximumBorrowingCapacity_6BB664A42088C1CBA8CC95F2D85F4CBE" 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-20200630.xsd#trs_LetterOfCreditMaximumBorrowingCapacity" xlink:label="loc_trs_LetterOfCreditMaximumBorrowingCapacity_6BB664A42088C1CBA8CC95F2D85F4CBE" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCredit_9A98648AC4983577CB6995F2D85FB951_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCredit_9A98648AC4983577CB6995F2D85FB951" 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_9A98648AC4983577CB6995F2D85FB951_label_en-US" xlink:label="lab_us-gaap_LineOfCredit_9A98648AC4983577CB6995F2D85FB951" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Line of Credit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_9A98648AC4983577CB6995F2D85FB951" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_C25D0D2CF4463F07289295F2D8602756_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_C25D0D2CF4463F07289295F2D8602756" 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/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_C25D0D2CF4463F07289295F2D8602756" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_A6FAD76D08D2320C179495F2D860CB55_terseLabel_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_A6FAD76D08D2320C179495F2D860CB55" 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_A6FAD76D08D2320C179495F2D860CB55_label_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_A6FAD76D08D2320C179495F2D860CB55" 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/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_A6FAD76D08D2320C179495F2D860CB55" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_9139132FF02918B558E095F2D8601DD9_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_9139132FF02918B558E095F2D8601DD9" 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/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount" xlink:label="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_9139132FF02918B558E095F2D8601DD9" xlink:type="locator" />
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    <link:label id="lab_trs_LongTermDebtFairValueOfParValue_2E0294D4517D28C2110395F2D860D425_terseLabel_en-US" xlink:label="lab_trs_LongTermDebtFairValueOfParValue_2E0294D4517D28C2110395F2D860D425" 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_2E0294D4517D28C2110395F2D860D425_label_en-US" xlink:label="lab_trs_LongTermDebtFairValueOfParValue_2E0294D4517D28C2110395F2D860D425" 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_2E0294D4517D28C2110395F2D860D425_documentation_en-US" xlink:label="lab_trs_LongTermDebtFairValueOfParValue_2E0294D4517D28C2110395F2D860D425" 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>
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    <link:label id="lab_us-gaap_ScheduleOfGoodwillTable_653771A09EFF029097275206BEA6EEA8_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfGoodwillTable_653771A09EFF029097275206BEA6EEA8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Goodwill [Table]</link:label>
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    <link:label id="lab_trs_MetricTypeAxis_BD50368448D7DA7CBE78730F60E6D598_terseLabel_en-US" xlink:label="lab_trs_MetricTypeAxis_BD50368448D7DA7CBE78730F60E6D598" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Metric Type [Axis]</link:label>
    <link:label id="lab_trs_MetricTypeAxis_BD50368448D7DA7CBE78730F60E6D598_label_en-US" xlink:label="lab_trs_MetricTypeAxis_BD50368448D7DA7CBE78730F60E6D598" 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_BD50368448D7DA7CBE78730F60E6D598_documentation_en-US" xlink:label="lab_trs_MetricTypeAxis_BD50368448D7DA7CBE78730F60E6D598" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Types of financial metrics.</link:label>
    <link:loc xlink:href="trs-20200630.xsd#trs_MetricTypeAxis" xlink:label="loc_trs_MetricTypeAxis_BD50368448D7DA7CBE78730F60E6D598" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_MetricTypeAxis_BD50368448D7DA7CBE78730F60E6D598" xlink:to="lab_trs_MetricTypeAxis_BD50368448D7DA7CBE78730F60E6D598" xlink:type="arc" />
    <link:label id="lab_trs_MetricTypeDomain_AE517A2AB9CBFC2D438C730F60E6A499_terseLabel_en-US" xlink:label="lab_trs_MetricTypeDomain_AE517A2AB9CBFC2D438C730F60E6A499" 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_AE517A2AB9CBFC2D438C730F60E6A499_label_en-US" xlink:label="lab_trs_MetricTypeDomain_AE517A2AB9CBFC2D438C730F60E6A499" 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_AE517A2AB9CBFC2D438C730F60E6A499_documentation_en-US" xlink:label="lab_trs_MetricTypeDomain_AE517A2AB9CBFC2D438C730F60E6A499" 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-20200630.xsd#trs_MetricTypeDomain" xlink:label="loc_trs_MetricTypeDomain_AE517A2AB9CBFC2D438C730F60E6A499" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_MetricTypeDomain_AE517A2AB9CBFC2D438C730F60E6A499" xlink:to="lab_trs_MetricTypeDomain_AE517A2AB9CBFC2D438C730F60E6A499" xlink:type="arc" />
    <link:label id="lab_trs_A3YearEpsCagrMetricMember_0C6AF25C4D334017CF0E730F60E8DAC8_terseLabel_en-US" xlink:label="lab_trs_A3YearEpsCagrMetricMember_0C6AF25C4D334017CF0E730F60E8DAC8" 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_0C6AF25C4D334017CF0E730F60E8DAC8_label_en-US" xlink:label="lab_trs_A3YearEpsCagrMetricMember_0C6AF25C4D334017CF0E730F60E8DAC8" 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_0C6AF25C4D334017CF0E730F60E8DAC8_documentation_en-US" xlink:label="lab_trs_A3YearEpsCagrMetricMember_0C6AF25C4D334017CF0E730F60E8DAC8" 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-20200630.xsd#trs_A3YearEpsCagrMetricMember" xlink:label="loc_trs_A3YearEpsCagrMetricMember_0C6AF25C4D334017CF0E730F60E8DAC8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_A3YearEpsCagrMetricMember_0C6AF25C4D334017CF0E730F60E8DAC8" xlink:to="lab_trs_A3YearEpsCagrMetricMember_0C6AF25C4D334017CF0E730F60E8DAC8" xlink:type="arc" />
    <link:label id="lab_trs_TotalshareholderreturnmetricMember_5AE6CAD9FDE1164D5607730F60E805AB_terseLabel_en-US" xlink:label="lab_trs_TotalshareholderreturnmetricMember_5AE6CAD9FDE1164D5607730F60E805AB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total shareholder return metric [Member]</link:label>
    <link:label id="lab_trs_TotalshareholderreturnmetricMember_5AE6CAD9FDE1164D5607730F60E805AB_label_en-US" xlink:label="lab_trs_TotalshareholderreturnmetricMember_5AE6CAD9FDE1164D5607730F60E805AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Total shareholder return metric [Member]</link:label>
    <link:label id="lab_trs_TotalshareholderreturnmetricMember_5AE6CAD9FDE1164D5607730F60E805AB_documentation_en-US" xlink:label="lab_trs_TotalshareholderreturnmetricMember_5AE6CAD9FDE1164D5607730F60E805AB" 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-20200630.xsd#trs_TotalshareholderreturnmetricMember" xlink:label="loc_trs_TotalshareholderreturnmetricMember_5AE6CAD9FDE1164D5607730F60E805AB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_TotalshareholderreturnmetricMember_5AE6CAD9FDE1164D5607730F60E805AB" xlink:to="lab_trs_TotalshareholderreturnmetricMember_5AE6CAD9FDE1164D5607730F60E805AB" xlink:type="arc" />
    <link:label id="lab_trs_AveragestockpriceMember_EDC16DE914677E9DDF4A730F60E8AFC0_terseLabel_en-US" xlink:label="lab_trs_AveragestockpriceMember_EDC16DE914677E9DDF4A730F60E8AFC0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Average stock price [Member]</link:label>
    <link:label id="lab_trs_AveragestockpriceMember_EDC16DE914677E9DDF4A730F60E8AFC0_label_en-US" xlink:label="lab_trs_AveragestockpriceMember_EDC16DE914677E9DDF4A730F60E8AFC0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Average stock price [Member]</link:label>
    <link:label id="lab_trs_AveragestockpriceMember_EDC16DE914677E9DDF4A730F60E8AFC0_documentation_en-US" xlink:label="lab_trs_AveragestockpriceMember_EDC16DE914677E9DDF4A730F60E8AFC0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Average stock price [Member]</link:label>
    <link:loc xlink:href="trs-20200630.xsd#trs_AveragestockpriceMember" xlink:label="loc_trs_AveragestockpriceMember_EDC16DE914677E9DDF4A730F60E8AFC0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_AveragestockpriceMember_EDC16DE914677E9DDF4A730F60E8AFC0" xlink:to="lab_trs_AveragestockpriceMember_EDC16DE914677E9DDF4A730F60E8AFC0" xlink:type="arc" />
    <link:label id="lab_us-gaap_PlanNameAxis_28E38BC06775A250361D730F60E98C2E_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameAxis_28E38BC06775A250361D730F60E98C2E" 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_28E38BC06775A250361D730F60E98C2E_label_en-US" xlink:label="lab_us-gaap_PlanNameAxis_28E38BC06775A250361D730F60E98C2E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan Name [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_28E38BC06775A250361D730F60E98C2E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PlanNameAxis_28E38BC06775A250361D730F60E98C2E" xlink:to="lab_us-gaap_PlanNameAxis_28E38BC06775A250361D730F60E98C2E" xlink:type="arc" />
    <link:label id="lab_us-gaap_PlanNameDomain_4013E7D62710A153094B730F60E96342_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameDomain_4013E7D62710A153094B730F60E96342" 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_4013E7D62710A153094B730F60E96342_label_en-US" xlink:label="lab_us-gaap_PlanNameDomain_4013E7D62710A153094B730F60E96342" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan Name [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_4013E7D62710A153094B730F60E96342" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PlanNameDomain_4013E7D62710A153094B730F60E96342" xlink:to="lab_us-gaap_PlanNameDomain_4013E7D62710A153094B730F60E96342" xlink:type="arc" />
    <link:label id="lab_trs_Plan1Member_43F845377F070ECB2A6E730F60EA5529_terseLabel_en-US" xlink:label="lab_trs_Plan1Member_43F845377F070ECB2A6E730F60EA5529" 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_43F845377F070ECB2A6E730F60EA5529_label_en-US" xlink:label="lab_trs_Plan1Member_43F845377F070ECB2A6E730F60EA5529" 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_43F845377F070ECB2A6E730F60EA5529_documentation_en-US" xlink:label="lab_trs_Plan1Member_43F845377F070ECB2A6E730F60EA5529" 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-20200630.xsd#trs_Plan1Member" xlink:label="loc_trs_Plan1Member_43F845377F070ECB2A6E730F60EA5529" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_Plan1Member_43F845377F070ECB2A6E730F60EA5529" xlink:to="lab_trs_Plan1Member_43F845377F070ECB2A6E730F60EA5529" xlink:type="arc" />
    <link:label id="lab_trs_Plan2Member_49D20A4C89FB6EF9B1DB730F60EA8E85_terseLabel_en-US" xlink:label="lab_trs_Plan2Member_49D20A4C89FB6EF9B1DB730F60EA8E85" 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_49D20A4C89FB6EF9B1DB730F60EA8E85_label_en-US" xlink:label="lab_trs_Plan2Member_49D20A4C89FB6EF9B1DB730F60EA8E85" 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_49D20A4C89FB6EF9B1DB730F60EA8E85_documentation_en-US" xlink:label="lab_trs_Plan2Member_49D20A4C89FB6EF9B1DB730F60EA8E85" 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-20200630.xsd#trs_Plan2Member" xlink:label="loc_trs_Plan2Member_49D20A4C89FB6EF9B1DB730F60EA8E85" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_Plan2Member_49D20A4C89FB6EF9B1DB730F60EA8E85" xlink:to="lab_trs_Plan2Member_49D20A4C89FB6EF9B1DB730F60EA8E85" xlink:type="arc" />
    <link:label id="lab_trs_Plan3Member_ED7955EE534BBB3D3278730F60EA48AF_terseLabel_en-US" xlink:label="lab_trs_Plan3Member_ED7955EE534BBB3D3278730F60EA48AF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan 3 [Member]</link:label>
    <link:label id="lab_trs_Plan3Member_ED7955EE534BBB3D3278730F60EA48AF_label_en-US" xlink:label="lab_trs_Plan3Member_ED7955EE534BBB3D3278730F60EA48AF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan 3 [Member]</link:label>
    <link:label id="lab_trs_Plan3Member_ED7955EE534BBB3D3278730F60EA48AF_documentation_en-US" xlink:label="lab_trs_Plan3Member_ED7955EE534BBB3D3278730F60EA48AF" 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-20200630.xsd#trs_Plan3Member" xlink:label="loc_trs_Plan3Member_ED7955EE534BBB3D3278730F60EA48AF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_Plan3Member_ED7955EE534BBB3D3278730F60EA48AF" xlink:to="lab_trs_Plan3Member_ED7955EE534BBB3D3278730F60EA48AF" xlink:type="arc" />
    <link:label id="lab_trs_Plan4Member_99BE35ED3A1C1162C6B5730F60EA10C6_terseLabel_en-US" xlink:label="lab_trs_Plan4Member_99BE35ED3A1C1162C6B5730F60EA10C6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan 4 [Member]</link:label>
    <link:label id="lab_trs_Plan4Member_99BE35ED3A1C1162C6B5730F60EA10C6_label_en-US" xlink:label="lab_trs_Plan4Member_99BE35ED3A1C1162C6B5730F60EA10C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan 4 [Member]</link:label>
    <link:label id="lab_trs_Plan4Member_99BE35ED3A1C1162C6B5730F60EA10C6_documentation_en-US" xlink:label="lab_trs_Plan4Member_99BE35ED3A1C1162C6B5730F60EA10C6" 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-20200630.xsd#trs_Plan4Member" xlink:label="loc_trs_Plan4Member_99BE35ED3A1C1162C6B5730F60EA10C6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_Plan4Member_99BE35ED3A1C1162C6B5730F60EA10C6" xlink:to="lab_trs_Plan4Member_99BE35ED3A1C1162C6B5730F60EA10C6" xlink:type="arc" />
    <link:label id="lab_trs_Plan5Member_BB3DCB04E66C9B2FAEC0730F60EA5504_terseLabel_en-US" xlink:label="lab_trs_Plan5Member_BB3DCB04E66C9B2FAEC0730F60EA5504" 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_BB3DCB04E66C9B2FAEC0730F60EA5504_label_en-US" xlink:label="lab_trs_Plan5Member_BB3DCB04E66C9B2FAEC0730F60EA5504" 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_BB3DCB04E66C9B2FAEC0730F60EA5504_documentation_en-US" xlink:label="lab_trs_Plan5Member_BB3DCB04E66C9B2FAEC0730F60EA5504" 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-20200630.xsd#trs_Plan5Member" xlink:label="loc_trs_Plan5Member_BB3DCB04E66C9B2FAEC0730F60EA5504" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_Plan5Member_BB3DCB04E66C9B2FAEC0730F60EA5504" xlink:to="lab_trs_Plan5Member_BB3DCB04E66C9B2FAEC0730F60EA5504" xlink:type="arc" />
    <link:label id="lab_trs_Plan7Member_FA684987552F7FA278BC730F60EAABAB_terseLabel_en-US" xlink:label="lab_trs_Plan7Member_FA684987552F7FA278BC730F60EAABAB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan 7 [Member]</link:label>
    <link:label id="lab_trs_Plan7Member_FA684987552F7FA278BC730F60EAABAB_label_en-US" xlink:label="lab_trs_Plan7Member_FA684987552F7FA278BC730F60EAABAB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan 7 [Member]</link:label>
    <link:label id="lab_trs_Plan7Member_FA684987552F7FA278BC730F60EAABAB_documentation_en-US" xlink:label="lab_trs_Plan7Member_FA684987552F7FA278BC730F60EAABAB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Plan 7 [Member]</link:label>
    <link:loc xlink:href="trs-20200630.xsd#trs_Plan7Member" xlink:label="loc_trs_Plan7Member_FA684987552F7FA278BC730F60EAABAB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_Plan7Member_FA684987552F7FA278BC730F60EAABAB" xlink:to="lab_trs_Plan7Member_FA684987552F7FA278BC730F60EAABAB" xlink:type="arc" />
    <link:label id="lab_trs_Plan8Member_57CFCD21B03EC22D41C3730F60EB6F72_terseLabel_en-US" xlink:label="lab_trs_Plan8Member_57CFCD21B03EC22D41C3730F60EB6F72" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan 8 [Member]</link:label>
    <link:label id="lab_trs_Plan8Member_57CFCD21B03EC22D41C3730F60EB6F72_label_en-US" xlink:label="lab_trs_Plan8Member_57CFCD21B03EC22D41C3730F60EB6F72" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan 8 [Member]</link:label>
    <link:label id="lab_trs_Plan8Member_57CFCD21B03EC22D41C3730F60EB6F72_documentation_en-US" xlink:label="lab_trs_Plan8Member_57CFCD21B03EC22D41C3730F60EB6F72" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Plan 8 [Member]</link:label>
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