Abstract: A railroad freight car including a cargo well for carrying optionally either intermodal cargo containers or highway semitrailers has a side sill structure including a deep rectangular top chord and a depending web, supporting a well floor structure. The well floor structure includes reinforcing longitudinal and transverse channel members and horizontal top and bottom plates attached to the channels. Large circular openings, aligned with one another, are defined in both the top and bottom plates, and a peripheral ring of vertical material interconnects the margins of the top and bottom plates around the openings, providing a light but stiff floor structure with a small vertical height. A side sill reinforcing walkway structure is located atop each side sill at each end of the cargo well, but is low enough to avoid interference with handling trailers.

Abstract: A multi-unit railway freight car of which each unit defines a container well for receiving cargo containers, and including a permanently installed power distribution cable arrangement, for receiving power from a generator carried in a container well and for providing power to containers carried in other container wells and container-carrying positions of the car units. Cables and terminal devices are located in positions largely protected from mechanical damage, and circuit breakers are associated with the cables to protect the cables and the generator from overloads.