What does a stop signal indicate in terms of train operations?

A stop signal indicates that an immediate stop is required for the train. This is a critical safety measure in railway operations, ensuring that trains do not proceed until it is safe to do so. Such signals may be used to prevent collisions, allow for track maintenance, or manage train movements at junctions or stations where other trains may be present.

Understanding the implications of a stop signal is vital for the safe operation of trains. When a train encounters a stop signal, the engineer must bring the train to a complete stop before the signal, assess the situation, and await further instruction, which can include receiving clearance to proceed or being directed to remain stationary until conditions change. This strict adherence to stop signals helps to maintain order and safety on the railway network.