 The interchange of cars with the national rail system occurs only at the Lee Hall junction where interchange tracks exist linking the FEMRR to (originally) the Chesapeake and Ohio Railway (C&O) (now CSX).FEMRR engines and cars were not permitted on C&O tracks beyond the Yorktown Road grade crossing except in emergencies.Cars outbound from Fort Eustis would be spotted on a designated interchange track (other than passing track #493, which was a dedicated runaround track) and deemed delivered to the C&O when the bills of lading and switch lists were signed by the C&O station agent.