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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