What must trains obtain within yard limits to use the main track?

To operate on the main track within yard limits, trains must obtain a track warrant that specifically lists track bulletins. This requirement ensures that the train crew is aware of any restrictions or conditions that may affect their movement on the main track, such as work zones, signals, and other pertinent information. Track warrants are formal authorizations issued to trains that provide critical information for safe operation, ensuring adherence to safety protocols and operational standards.

The primary purpose of this process is to maintain safety by ensuring that train crews have all necessary information before proceeding within yard limits, which can be an area of increased activity and potential hazards. This protocol helps prevent accidents and facilitates coordination among multiple trains and yard operations, allowing for efficient management of train movements.