What does the signal aspect that shows 'stop and stay' require from the train operator?

The signal aspect indicating 'stop and stay' requires the train operator to come to a complete stop and remain in that position. This signal is used to ensure the safety of the train, its passengers, and any operations ahead. When a signal specifies 'stop and stay,' it communicates that the train must not proceed further until the signal changes to a more permissive aspect, indicating it is safe to move.

Understanding the importance of this aspect is crucial for train operations. It directly relates to safety protocols designed to prevent collisions and to manage train movements effectively, particularly in busy rail networks or at junctions where multiple tracks converge. Therefore, when the signal is activated, the operator must comply strictly by stopping and remaining stationary until instructed otherwise by subsequent signals or protocols.

In contrast, other responses suggest actions that would be inappropriate under a 'stop and stay' signal. Proceeding without stopping or only slowing down without fully stopping would compromise safety. Preparing to change tracks is also not applicable unless explicitly directed by a different signal.