A train operator should expect to see a green light when?

A train operator should expect to see a green light when the train is cleared to depart the station. The green light typically indicates that all systems are operational and that it is safe for the train to proceed. In the context of train operations, green lights are crucial signals that convey important information regarding train movement and safety. When departing a station, a green light signifies that the operator has been given the signal to move forward, ensuring that the pathway is clear and that there are no obstructions ahead.

In contrast, other situations involve different signal interpretations. For instance, when approaching a station, the lights might signal caution or stop, depending on operational protocols. The context of the train's position relative to workers on the track is also important, as specific signals would apply based on the safety requirements surrounding their presence. Lastly, entering a tunnel may not be associated with a green light, which often pertains to clear paths ahead rather than specific structures like tunnels. Understanding these signal meanings is vital for safe train operations, making the recognition of a green light at the time of departure an essential aspect of an operator's responsibilities.