The working principle of the electric locomotive (1) is to obtain the forward energy through the contact between the top pantograph and the contact net. Electric vehicles are equipped with pantograph top, generally by the driver to control the lift. After the Pantograph is raised, the traction motor is provided by the power supply equipment to drive the traction motor, and the electric power is transmitted to the locomotive through the main circuit breaker, to drive an electric locomotive by means of moving parts.