Dxc tunnel motor. This unit is designed to use a SD40-2 chassis, but can be adapted for other chassis. Cab wall is 1mm thick with enlarged cab windows. Includes air ducting, ditchlights on front headstock, fuel tank, sand boxes, corner steps and brass mesh grill for radiator, and couplers(non-operating), air hoses, fine wire for handgrabs and glazing for windows.