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v3.25.3

Derivatives (Additional Information) (Details) | 9 Months Ended
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Sep. 30, 2025
Foreign Currency [Abstract] |
Description Of Contract | contracts with terms between one and 12 months, which require the Company to exchange currencies at agreed-upon rates at each settlement date.

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- Definition Description Of Contract + References No definition available. + Details
Name: | rail_DescriptionOfContract
Namespace Prefix: | rail_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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