When can the train dispatcher change a signal to Stop position after it has been cleared?

The correct answer is that the train dispatcher can change a signal to the Stop position only after the engineer confirms that the train is stopped. This requirement ensures that the safety of operations is maintained. When the signal has been cleared for a train to proceed, there is an inherent responsibility for both the engineer and the dispatcher to manage the movement safely.

The dispatcher is tasked with overseeing the entire operation and must wait for confirmation from the engineer that the train has indeed come to a complete stop before making any changes to the signal. This confirms that the train is in a safe position and that any potential risks or conflicts with other trains are mitigated.

This rule is designed to prevent accidents that could occur if a dispatcher were to change a signal without knowing the current status of the train, ensuring a coordinated and safe operation across the railway system.