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Segment Information - Schedule of Segment Reporting Information, by Segment (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting [Abstract]
Loss on pension settlement	$ 313	$ 8,105
Impairment on leased railcars	4,091	4,515
Gain on sale of railcars available for lease	$ 622	$ 0

X

- Definition

The aggregate impact on earnings in the period of the gain from the difference between the sale price and the book value of Railcars available for lease that were sold during the reporting period.

+ References

No definition available.

+ Details

Name:	rail_GainOnSaleOfRailcarsAvailableForLease
Namespace Prefix:	rail_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Impairment Of Leased Railcars

+ References

No definition available.

+ Details

Name:	rail_ImpairmentOfLeasedRailcars
Namespace Prefix:	rail_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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