When must the engine bell be sounded?

The requirement to sound the engine bell is crucial for safety and communication on the railroad. It is necessary to announce the movement of a train and alert both crews and pedestrians in the vicinity. This is particularly important when the train is about to move, as it serves as a warning to anyone nearby that the train is starting its journey. Additionally, sounding the bell in emergencies helps to alert individuals to potential hazards, providing an extra layer of safety in unexpected situations.

In contrast, only sounding the bell when passing other trains does not cover the full array of safety scenarios that must be accounted for when operating a train. Stopping at public crossings is a separate requirement that has different signaling protocols. The notion of only using the bell during nighttime operations overlooks the fact that trains operate at all hours and safety measures must be consistent throughout. Thus, the comprehensive approach of sounding the bell when about to move and in emergencies safeguards the welfare of all stakeholders involved in rail operations.