Under track warrant control, what is necessary for a train to occupy a main track?

For a train to occupy a main track under track warrant control, it is essential to have proper authority or protection. This ensures that the train operates safely and in accordance with established protocols. Track warrant control is a method of train operation that requires explicit permission from the dispatcher before a train is allowed to enter or occupy a designated track section, which is typically communicated through a track warrant. This authority is crucial because it helps prevent collisions and ensures that the prescribed routes are clear of conflicting train movements.

The concept of authority under track warrant control confirms that the train crew has received explicit instructions regarding their movement, which includes details such as the specific limits of the track they are allowed to occupy. This is a critical safety measure in coordinated railway operations, ensuring that all movements are accounted for and regulated.

In contrast, continuous monitoring of speed, notification of the dispatcher, and signaling a green light do not fully address the requirement for obtaining explicit approval to occupy the track. While they may be important operational aspects, they do not serve as a substitute for the necessary authority or protection that must be obtained before a train can legally and safely occupy the main track.