What happens when the lighted indication shows that all side doors are closed?

When the lighted indication shows that all side doors are closed, it signifies that the train is prepared for departure. This visual cue is crucial for train operators as it indicates that all passengers are safely inside and that there are no obstructions preventing the train from moving. The closure of doors is a safety protocol, ensuring that the doors are secure and that it is safe to start the journey.

In a well-functioning train operation, the system is designed to provide this confirmation before allowing the train to leave the station. It plays a vital role in maintaining safety standards during train operations. This readiness for departure is an essential aspect of effective train management.