When can the Dispatcher change the route after a signal has cleared?

The correct answer states that the Dispatcher can change the route after ensuring the movement has been completed. This is critical because it emphasizes the importance of ensuring that a train has moved past a signal and that the route is clear. Once the movement is successfully completed, the Dispatcher can confidently make changes to the route without risking confusion or unsafe conditions for other trains.

The role of the Dispatcher involves managing train movements and ensuring safe operations on the track. Making changes before a train has completed its movement could lead to potential conflicts between trains, especially if another train is approaching that route, which could jeopardize safety. Ensuring that the movement is completed allows the Dispatcher to have a clear understanding of the current status of the tracks, thereby reducing the risk of accidents and ensuring the efficiency of train operations.