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v3.23.3

Segment Information (Schedule of Segment Reporting Information, by Segment - Schedule of Segment Reporting Information, by Segment (Parenthetical) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Segment Reporting [Abstract] |  |  |  |
Loss On Pension Settlement | $ 313 | $ 8,105 | $ 313 | $ 8,105

X
- Definition Income loss on pension settlement. + References No definition available. + Details
Name: | rail_IncomeLossOnPensionSettlement
Namespace Prefix: | rail_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration