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These shares were sold in multiple transactions at prices ranging from $27.01 to $27.275, inclusive. The reporting person undertakes to provide L.B. Foster Company, any security holder of L.B. 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those 9,315 Performance Restricted Stock Units settled at the end of the 2022-2024 performance period upon certification by the Compensation Committee on 2/20/2025."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Includes 15,874 Performance Restricted Stock Units earned under the 2023-2025 Long Term Incentive Plan granted on 2/14/2023; those 15,874 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2025, upon certification by the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F7","text":"Includes 2,035 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 2,035 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification of the Compensation Committee."}],"balance_after":82918,"source":{"system":"sec-edgar","filing":"0000352825-25-000042","document":"wk-form4_1740436505.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/352825/000035282525000042/wk-form4_1740436505.xml","form_type":"4"}},{"id":1251398,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":70513,"kind":"person","name":"Kelly Brian H","position":1,"cik":"0001375886","reported_name":"Kelly Brian H","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and Sr. Advisor to the CEO"}}],"security":"Common Stock","published_at":"2025-02-24T22:35:12.000Z","date":"2025-02-20","kind":"grant","planned":false,"acquired":true,"shares":2035,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F6","text":"Represents the number of Performance Restricted Stock Units under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024 upon certification of performance results by the Compensation Committee at 25.8% for the annual period ended December 31, 2024.  The earned performance restricted stock units will settle at the end of the performance period on December 31, 2026, upon certification by the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 9,315 shares of common stock resulting from the settlement of Performance Restricted Stock Units earned under the 2022-2024 Long Term Incentive Plan granted on 02/17/2022; those 9,315 Performance Restricted Stock Units settled at the end of the 2022-2024 performance period upon certification by the Compensation Committee on 2/20/2025."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Includes 15,874 Performance Restricted Stock Units earned under the 2023-2025 Long Term Incentive Plan granted on 2/14/2023; those 15,874 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2025, upon certification by the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F7","text":"Includes 2,035 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 2,035 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification of the Compensation Committee."}],"balance_after":86969,"source":{"system":"sec-edgar","filing":"0000352825-25-000042","document":"wk-form4_1740436505.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/352825/000035282525000042/wk-form4_1740436505.xml","form_type":"4"}},{"id":1251397,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":70513,"kind":"person","name":"Kelly Brian H","position":1,"cik":"0001375886","reported_name":"Kelly Brian H","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and Sr. Advisor to the CEO"}}],"security":"Common Stock","published_at":"2025-02-24T22:35:12.000Z","date":"2025-02-20","kind":"grant","planned":false,"acquired":true,"shares":7352,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Represents the number of Performance Restricted Stock Units earned under the 2023-2025 Long Term Incentive Plan granted on 2/14/2023 upon certification of performance results by the Compensation Committee at 48.4% for the annual period ended December 31, 2024.  The earned Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2025, upon certification by the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 9,315 shares of common stock resulting from the settlement of Performance Restricted Stock Units earned under the 2022-2024 Long Term Incentive Plan granted on 02/17/2022; those 9,315 Performance Restricted Stock Units settled at the end of the 2022-2024 performance period upon certification by the Compensation Committee on 2/20/2025."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Includes 15,874 Performance Restricted Stock Units earned under the 2023-2025 Long Term Incentive Plan granted on 2/14/2023; those 15,874 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2025, upon certification by the Compensation Committee."}],"balance_after":84934,"source":{"system":"sec-edgar","filing":"0000352825-25-000042","document":"wk-form4_1740436505.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/352825/000035282525000042/wk-form4_1740436505.xml","form_type":"4"}},{"id":1251396,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":70513,"kind":"person","name":"Kelly Brian H","position":1,"cik":"0001375886","reported_name":"Kelly Brian H","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and Sr. Advisor to the CEO"}}],"security":"Common Stock","published_at":"2025-02-24T22:35:12.000Z","date":"2025-02-20","kind":"grant","planned":false,"acquired":true,"shares":3988,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares of common stock resulting from Performance Share Units earned under the 2022-2024 Long Term Incentive Plan granted on 2/17/22 upon certification of performance results by the Compensation Committee at 35.7% for the annual period ended December 31, 2024."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 9,315 shares of common stock resulting from the settlement of Performance Restricted Stock Units earned under the 2022-2024 Long Term Incentive Plan granted on 02/17/2022; those 9,315 Performance Restricted Stock Units settled at the end of the 2022-2024 performance period upon certification by the Compensation Committee on 2/20/2025."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 8,522 Performance Restricted Stock Units earned under the 2023-2025 Long Term Incentive Plan granted on 2/14/2023; those 8,522 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2025, upon certification by the Compensation Committee."}],"balance_after":77582,"source":{"system":"sec-edgar","filing":"0000352825-25-000042","document":"wk-form4_1740436505.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/352825/000035282525000042/wk-form4_1740436505.xml","form_type":"4"}},{"id":1262354,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":70513,"kind":"person","name":"Kelly Brian H","position":1,"cik":"0001375886","reported_name":"Kelly Brian H","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and Sr. Advisor to the CEO"}}],"security":"Common Stock","published_at":"2025-02-19T20:51:50.000Z","date":"2025-02-17","kind":"tax_withholding","planned":false,"acquired":false,"shares":890,"price":27.5,"value":24475.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Shares withheld to pay taxes applicable to the vesting of restricted stock related to the 2022-2024 LTIP awarded on 2/17/22."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 5,327 Performance Restricted Stock Units earned under the 2022-2024 Long Term Incentive Plan granted on 02/17/2022; 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Fifty percent of the award, or 1,666 shares, may be earned when the consecutive 30 day average closing stock price per share of the Company's common stock on the Nasdaq Stock Market is $25.00 per share or more and is generally  subject to continued employment with the Company until the third anniversary of the grant date. The remaining 50% of the award, or 1,667 shares, may be earned when the consecutive 30 day average closing stock price per share of the Company's common stock on the Nasdaq Stock Market is $30.00 per share or more and is generally subject to continued employment with the Company until the third anniversary of the grant date. 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