When should the "TRAIN" line on the train sheet be filled in?

The "TRAIN" line on the train sheet should be filled in once the lead unit is confirmed. This is important because the train sheet serves as an official record of the trains operating on the network, and it must reflect accurate and up-to-date information. Confirming the lead unit ensures that the dispatcher has the correct train identification and details that are crucial for tracking and coordinating train movements throughout the rail system. This confirmation step helps maintain safety and efficiency in rail operations, as it allows for effective communication with other departments and personnel involved in train management. Filling in this information prematurely—before confirming the lead unit—could lead to inaccuracies that might compromise operational reliability and safety.