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v3.25.3

Employee Retention Credit (Additional Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025
Employee-related Liabilities [Abstract] |  |
ERC fund received | $ 187 | $ 3,304

X
- Definition ERC Fund Received + References No definition available. + Details
Name: | rail_EmployeeRetentionCreditFundReceived
Namespace Prefix: | rail_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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