What must be done each time the train comes to a full stop during MATC operations?

In MATC (Microprocessor-based Automatic Train Control) operations, it is crucial to push the ATC Start button each time the train comes to a full stop. This action is essential for re-engaging the Automatic Train Control system after a complete stop has been made. The ATC system manages the safe and efficient operation of the train, ensuring adherence to speed limits and signal compliance.

By pressing the ATC Start button, the train engineer confirms that the train is ready to proceed under the control of the ATC system. This step is fundamental for maintaining operational safety and continuity, allowing the onboard systems to resume normal function. It's a key procedure that ensures the automated systems are properly activated and that the train is under the correct operational mode when resuming movement.

Other options, while they may relate to train safety and operation, do not specifically address the operational requirements following a complete stop in MATC operations. Checking the brake system, notifying the conductor, or changing modes to ATO (Automatic Train Operation) may be critical procedures in other contexts or operational modes, but the immediate requirement after a full stop specifically focuses on the activation of the ATC system through the ATC Start button.