Abstract: Disclosed herein is improvement of the standard Type-E or Type-F coupler, which is compatible with the existing standard couplers, for providing automatic uncoupling features. The improved coupler includes a coupler head of the type having standard coupling knuckle, guard arm, and an standard interior knuckle-control structure within a lock-receiving chamber. Said interior knuckle-control structure includes the standard components such as a knuckle-lock attached to a lock-lift assembly, a knuckle thrower and other standard components. In order to provide the coupler with automatic uncoupling feature, an electric actuator, such as a motor or a solenoid, is installed within a chamber provided behind said guard arm. Said actuator controls the movement of the lock-lift assembly via a leverage system provided so that the coupler lock can be lifted to the lock-set position by said actuator. The actuator is connected to and controlled by the serialization and operation-control system of the train.