Abstract: A railroad box car has a truck-carrying railroad chassis and walls on the chassis forming a closable longitudinally extending space that is heated or cooled. According to the invention the walls are each formed of an inner skin, an outer skin, and a mass of cellular plastic foam between the skins bonded at least to an outer face of the respective inner skin. Plastic struts holding the inner and outer skins apart. The walls include a horizontal floor, a pair of upright and transverse end walls, a pair of upright and longitudinal side walls each formed by two slidable doors, and a horizontal roof. Each outer wall is spaced from the respective inner wall.

Abstract: A floor plate for a cooling container of sandwich construction in which an upper cover plate and a lower cover plate are bridged by a rigid foam. The gooseneck tunnel of the floor plate is insulated by a vacuum insulated plate which can contain a support medium and which is embedded in the surrounding foam.