Product Description. 25t heavy cargo motorized flat cart running on railway. 1. Introduction of railway flat cart. The railway flat cart is powered by cable reel,which is magnetic coupling to ensure the cable rolling and releasing smoothly. This kind cable reel powered transfer carts generally run within 200m due to the limitation of cable. The power source is directly supplied to the traction motor to control by the cable to control the heavy duty material transfer carts to work.