What is the purpose of a stop signal during rail operations?

A stop signal is an essential part of rail operations, designed specifically to instruct a train to come to a complete halt. This signal serves as a critical safety mechanism, ensuring that trains can pause to avoid potential collisions or other hazards. For instance, a stop signal might be used when a train approaches a location where another train is occupying the same track, or when a signaler has determined that conditions are not safe for the train to proceed.

The function of a stop signal is distinct and vital compared to other signals that may indicate reduced speed, track changes, or maintenance updates. A stop signal's primary and singular directive is to ensure that train operators understand they must stop their train completely. This clarity is crucial for maintaining operational safety and efficiency on rail networks.