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OS is the railroad term for On Station. It refers to when a train accepts a signal, or occupies what is referred to by Signals and Communications as the "OS" Track. In dark territory, it is also a "track release" location. The RTC may ask for an "OS" by Mile 25. When the train calls to report they are entirely by Mile 25, the RTC can release the section of track the train has operated over. In Old School Railroading, OS referred to "On Sheet", where a train sheet was used to report times that trains had reported over specific locations.

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13y ago

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