... Made of thick steel plates 4.One year warranty Name: 10T battery locomotive for underground mining transportation and tunneling Model: ... , different weight of trolley locomotive, the weight have 7t, 8t, 10t, 12t, 14t, 18t, 20t, 25t, 30t, 35t, 40t, 45t, ... by big power IGBT parts, driving three phase asynchronous motor, using asynchronous motor 's cliffy torque, rotate speed with advanced control ...