换向器
换向器是一种控制装置，通常是杠杆，用于设置机动轨道车辆的移动方向——前进、后退或空档。后者通常将车轮与动力总成完全分开。撤销 切勿在车辆行驶时操作，以免对动力总成造成灾难性损坏。出于同样的原因，通常需要松开油门和动态制动器才能使反向器运行。
On steam engines, the equivalent of the reverser is called cutoff. It is a bit more complex in that it determines the steam intake duration per cylinder cycle.
See also: Throttle, Dynamic Brake, Cutoff, Steam Drivetrain, Traction Motors, Hydraulic Transmission, Mechanical Transmission