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Contingencies (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2017 | Dec. 31, 2015
State and local incentives received |  | $ 1,410 | $ 15,733
Deferred liability balance | $ 8,051 |  |
Contingency losses | $ 7,500 |  |
Maximum [Member] |  |  |
Incentive term | 6 years |  |

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- Definition Deferred income from government grants as of the balance sheet date. This liability represents the portion of government grants received which has not yet been recognized in the income statement. + References No definition available. + Details
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Namespace Prefix: | rail_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition The cash inflow during the period from government grants received. + References No definition available. + Details
Name: | rail_ProceedsFromGovernmentGrantsReceived
Namespace Prefix: | rail_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |