One of the cars that are loaded at production points and hauled to the pit bottom or surface in a train by locomotives or other power. They vary in capacity, and are either of wood or steel construction or combinations of both. Mine cars have been classified into six kinds: (1) the solid or box type, which requires a rotary dump at the unloading terminal; (2) the rocker dump type, which has a V-shaped body rounded at the bottom; (3) the gable-bottom car, which is shaped like a capital W in cross section; (4) the Granby car, a special form of a side-dumping car; (5) bottom-dump cars; and (6) enddump cars, which are commonly used for hand tramming in small mines.