The battery powered rail transfer cart is waterproof, it can be work outdoors. The battery installed in the transfer carts to driven the rail transfer cart move. Product Information: Model: LDX-30T. Load Capacity: 30 tons. Size: 6100*2500*500(310)mm. Wheel Diameter: 400mm and 300mm. Running Track: Straight Line. Working Speed: 0-20m/min