Under MATC mode, what action must the Train Engineer take at a Call for Orders location?

In MATC mode, the Train Engineer must transition to MCS mode when at a Call for Orders location. This is because Call for Orders represents a point where the authority of the track may be interrupted, requiring the Train Engineer to follow protocols to ensure safe operation. By transitioning to MCS mode, the engineer can accurately receive and interpret movement instructions that might factor in any updates, speed restrictions, or operational changes in real-time.

Remaining in MATC mode or switching to Release mode would not provide the necessary oversight and compliance required in this situation, while notifying passengers of delays, although part of good customer service, does not adhere to the operational safety protocols that dictate the response at a Call for Orders. Thus, the transition to MCS mode ensures safety and adherence to track authority changes.