What action must a train perform if a signal indicates to "Stop"?

When a signal indicates to "Stop," the train is required to come to a complete stop. This instruction is a critical safety measure designed to ensure the safe operation of rail services. Stopping allows for the assessment of the situation ahead, which may involve another train on the same track, track work, or any other obstruction that could pose a danger to safe travel.

Coming to a complete stop ensures that the train does not inadvertently proceed through a potentially hazardous area. Unlike reduced speed or slowing down significantly, which could still result in a hazard if the train moves into danger, a complete stop guarantees that the crew can make decisions based on accurate information before proceeding. Ignoring the signal could lead to serious accidents, making the directive to stop fundamental in maintaining safety in rail operations.