Who needs to be notified of the engine's identifying number before entering the main track?

The requirement to notify the train dispatcher of the engine's identifying number before entering the main track is crucial for maintaining safety and ensuring proper communication across the railway network. The train dispatcher is responsible for overseeing train movements on the main track and coordinating with various personnel to ensure safe operations. By providing the engine's identifying number, the dispatcher can identify the specific train, track its movements, and confirm that it is cleared to enter the main line without conflicts with other trains.

This communication helps prevent potential accidents and ensures that the dispatcher can manage the overall traffic on the rail network efficiently. The dispatcher acts as a central point of information, so knowing the engine's identifying number is essential for accurate monitoring and decision-making regarding train movements.