Operational Principle Of Industry Material Transfer Trolley When the industry material transfer trolley moves, the cable pulls behind the industry material transfer trolley. The cable is connected to the ground at one end, while the other is powered by an electric control box on industry material transfer trolley, and then provide the power to the engine. The industry material transfer trolley conduct AC 380V directly into the electrical control system of the trolley to let it start, stop, go forward and backward and so on. The Components Of Industry Material Transfer Trolley