When must a train crew notify the dispatcher?

A train crew must notify the dispatcher when entering DCS (Distributed Command System) territory because this action typically requires communication to ensure that the dispatcher is aware of the train's location and the status of the track.

In DCS territory, the dispatcher manages train movements using technology that requires real-time data about train positions and movements. By notifying the dispatcher upon entering this territory, the crew ensures that the dispatcher can effectively monitor and coordinate train operations, which is critical for maintaining safety and preventing conflicts on the tracks.

The other situations—exiting the station, being at a stopping point, and reaching the destination—do not necessarily require immediate communication with the dispatcher unless specific instructions or changes to the operating conditions occur. Each of these actions may be routine and accounted for within the overall train schedule, but the entry into DCS territory is a critical point that demands confirmation to ensure proper oversight and operational safety.