In Rule 171 territory, what does the Track Authority Form primarily control?

The Track Authority Form in Rule 171 territory primarily controls the use of the main track. This form is essential for establishing the terms under which trains are allowed to use the main line, ensuring that operations are coordinated and that trains have permission to occupy the main track. This approach helps maintain safety by preventing unauthorized access and provides clarity on which trains can operate in the territory at any given time.

Given the significance of managing track use for safety and efficiency, the Track Authority Form is central to operational protocols in this context. It serves as a communication tool for train crews to understand their rights to the main track, which is critical for preventing collisions and coordinating train movements. This focus on the main track is a fundamental aspect of track safety management and rail operation procedures.