Product Description. 1. Brife Introduction of Motorized Electric Driven Transfer Trolley (KPX-20T) This kind of Motorized Electric driven Transfer Trolley (KPX-20T) is powered by the battery,the DC motor and gear reducer are controlled by DC control system to drive wheels and make the transport carriage start, stop, go forward and backward, speed up and slow down and so on.This rail transfer car battery handle can beCustom both on the "s"and arc-shaped railways.