 Inbound cars would be spotted on the interchange track by the C&O and deemed delivered to the Government when uncoupled from the engine (or the rest of the train) that brought them there.FEMRR engines and trains were not allowed on the C&O main line except in emergencies.However, with proper prior arrangement, C&O trains or light engines (engines under power but not coupled to cars or dead engines) were allowed to operate on FEMRR tracks on the Industrial Subdivision (save the Port Branch), the Wye Tower Interlocking Plant, and the part of the James River Subdivision between O'Brien, the wye and Hanks, including Hanks Yard.