What occurs when a train enters Yard territory with the ATC mode switch in MATC position?

When a train enters Yard territory with the ATC mode switch in the MATC position, it is required to stop before leaving the mainline. This safety measure is in place to ensure that the train is properly controlled when transitioning to an area where the operations and signaling may differ from that of the mainline. The MATC (Manual Automatic Train Control) position indicates that the train's automatic control system is managing the speed and movement but must adhere to specific protocols for entering different operational areas, such as a yard.

Upon entering Yard territory, the train needs to come to a complete stop to ensure safety protocols are followed, allowing for proper checks and measures to be established before the train can continue its journey. This stop helps to prevent any potential collision or operational issues that could arise from the differences in signaling and track conditions that are typical in yard environments.

In contexts related to train operations and safety, making sure that a train halts before transitioning into a yard establishes a clear protocol that mitigates risks associated with manual operations and unexpected situations that could occur in a busier switching environment.