XML 108 R87.htm IDEA: XBRL DOCUMENT
v3.23.1

Employee Benefit Plans (Schedule of Assumptions Used) (Details) | Dec. 31, 2022 | Dec. 31, 2021
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Discount rates | 5.22% | 2.84%

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- Definition Defined Benefit Plan, Assumptions Used Calculating, Discount Rate + References No definition available. + Details
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Namespace Prefix: | rail_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration