What must a train operator do when entering a station after bypassing?

When a train operator has bypassed a station and is now entering, it is crucial to blow the horn upon entering and leaving the station as a standard safety protocol. This practice serves multiple purposes. First, it alerts any personnel in the vicinity that a train is approaching, which is particularly important in busy stations where there may be passengers or staff nearby. Second, it ensures that everyone is aware of the train's presence, thereby enhancing safety by preventing accidents.

Blowing the horn also serves as an acknowledgment that the train is returning from a bypass, thereby communicating its intention to enter the station. This practice helps maintain a predictable and safe environment for both passengers and crew members. While other actions, like signaling staff or reducing speed, may be necessary in certain scenarios, the key standard operating procedure is to use the horn for safety when entering and leaving the station.