逆轉機
逆轉機是一種控制裝置，通常透過操縱桿進行操作，用於切換動力車輛的行駛方向：前進、後退、或空檔；空檔通常會使車輪與動力總成完全分離。在車輛行駛中不應該操作逆轉機，以免導致動力總成徹底失效。也因此，逆轉機通常必須在油門或動力軔機完全放鬆之後才能進行操作。
Vehicles equipped with a reverser can run both forward and backward with equal capacity, and are even equipped with lights on both ends for this purpose. Depending on the vehicle design, the only difference when changing orientation can be the driving visibility, and cooling behavior.
Reversers should never be operated when vehicles are in motion, to avoid catastrophic damage to the powertrain. For the same reason, to operate the reverser, throttle and dynamic brakes need to be disengaged.
Many vehicles only have one set of controls, facing a particular direction. To drive these vehicles in the opposite direction comfortably, it helps to use the universal control stand, or a locomotive remote controller, if supported.