How should a train operator act when encountering Rule 231 signs without Slow Speed indication in MATC mode?

In MATC mode, when a train operator encounters Rule 231 signs that do not indicate Slow Speed, the appropriate action is to take manual control and comply with Rule 231. This rule establishes safety protocols that are critical to maintaining safe operations, particularly in instances of signaling systems that may not be fully operational or clear.

Taking manual control allows the operator to have direct oversight of the train's performance and ensure adherence to all safety regulations that Rule 231 encompasses, which might involve slowing down, stopping, or other response actions pertinent to the situation. By complying with Rule 231, the train operator prioritizes safety for themselves, the passengers, and the overall operational integrity of the train system.

The other options present lesser responses that do not adequately address safety protocols or professional operational standards. Disregarding Rule 231 could lead to safety hazards, proceeding without notification might ignore essential communication protocols, and waiting solely for verbal instructions from the Trainmaster could delay necessary action in a potentially hazardous situation. Thus, the chosen response not only aligns with safety practices but also reflects a commitment to responsible train operation.