US Patent 7228805 Temperature controlled railway car

A composite box structure mounted on and attached to a railway car underframe to form a temperature controlled railway car. The composite box structure defined in part by an exterior metal surface, interior side stakes and at least one layer of fiber reinforced material attached to the side stakes. Insulating material may be disposed between the side stakes, the exterior metal surface and the at least one fiber reinforced layer of fiber reinforced material. The insulating materials provide resistance to heat transfer between the interior and the exterior of the composite box structure. A primary floor assembly and a secondary floor assembly may be mounted on the railway car underframe.