This kind of industrail standards steel shop electric die handling trailer 20t move on rails is running on steel rails or steel squre bars.It is commonly applied in steel plant, aluminum factory, plastic pipes factory, etc to transfer rounded material, from producing line to store. The power supply of the rail transfer car can be customized, we can recommend client a suitable type according to their working site, It can be storage battery power, cable drum power, Busbar power, conductor rail