During commission hours, when should holding lights be displayed?

Holding lights should be displayed when connecting trains are present to ensure safe and effective communication between train operators and tower personnel. This indication is critical at times when trains may experience delays or be waiting for clearance, and it makes it clear to both train operators and other personnel that the system is currently in a state that requires cautious operation due to nearby connecting train activities.

This practice enhances safety by preventing potential accidents, as it alerts all relevant parties to the presence of connections, which may not be immediately visible. By adhering to this protocol, tower operators can maintain a smooth flow of operations and manage the movement of trains efficiently while minimizing the risk of collision or miscommunication.