What should train operators verify when encountering yellow flags in MATC mode?

When train operators encounter yellow flags in MATC (Moving Automatic Train Control) mode, they must prioritize manual control and compliance with signaling. Yellow flags indicate a cautionary condition that requires operators to take specific actions to ensure safety. This situation indicates that the operator should be prepared to stop and must be vigilant about the signaling that governs train operations.

In this mode, the automatic systems may not manage the train’s speed or direction effectively due to potential restrictions highlighted by the yellow flags. Therefore, maintaining manual control allows the operator to respond to changing conditions and signals accurately. Compliance with signaling is crucial, as it guides the operator on when to act, such as slowing down or stopping, to avoid potential accidents or hazards on the track.

The other options do not reflect the necessary actions that should be taken in the context of yellow flags. Full speed operation would be contrary to the caution indicated by a yellow flag, and simply describing procedures or monitoring speeds without manual intervention does not prioritize the safety measures needed for effective train operation under cautionary signals.