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Railway Operating Revenues - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Disaggregation of Revenue [Line Items] |  |  |  |  |
Average transit days (or less) |  |  | 7 days |  |
Revenue, payment terms (in days) |  |  | 15 days |  |
Contract assets | $ 0 |  | $ 0 |  | $ 0
Contract liabilities | $ 0 |  | $ 0 |  | $ 0
Ancillary Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Ancillary services percent of total railway operating revenues (as a percent) | 5.00% | 4.00% | 5.00% | 4.00% |

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