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Product Warranties (Narrative) (Details)	12 Months Ended
	Dec. 31, 2023
Maximum [Member]
Warranty period	5 years

X

- Definition

Length of warranty period for new products produced.

+ References

No definition available.

+ Details

Name:	rail_WarrantyPeriod
Namespace Prefix:	rail_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: