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v3.21.1

Product Warranties (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2020
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: |