Definitions for "Flat Car"
A railroad car without sides, generally a "platform on wheels."
A freight car having a floor without any housing or body above. Frequently used to carry containers and/or trailers or oversized/odd-shaped commodities. The three types of flat cars used in intermodal are conventional, spine and stack cars.
An open car without sides, ends or top, used principally for hauling lumber, stone, heavy machinery, etc.
Keywords:  railcar, roof, walls
A railcar without a roof and walls.