What does a continuous blast of the engine whistle or horn indicate?

A continuous blast of the engine whistle or horn is recognized as an emergency signal to alert all crew members to apply the brakes. This signal indicates an urgent situation that necessitates an immediate response to ensure the safety of the train and its occupants. In scenarios where potential danger is present, such as when encountering obstacles on the tracks or potential collisions, the continuous blast is a clear command for swift action.

This protocol is critical in maintaining safety on the railway and ensures that all crew members are unified in their response, allowing for a rapid and coordinated effort to halt the train if needed. It is not simply a warning signal or an indication of train speed; rather, it underscores the need for immediate safety measures.