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Revenue Recognition (Narrative) (Details) | 3 Months Ended
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Mar. 31, 2018
Revenue Recognition [Abstract] |
Warranty Term | 5 years

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- Definition Warranty Term + References No definition available. + Details
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Namespace Prefix: | rail_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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