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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2015
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Fair Value Measurements [Abstract] |  |  |
Purchase price in escrow | $ 980 | $ 980 | $ 1,960

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- Definition Amount of aggregate purchase prices related to the disposal of an asset or business unit in order to secure indemnification obligations. + References No definition available. + Details
Name: | rail_PurchasePriceInEscrow
Namespace Prefix: | rail_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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