What is the required action when encountering Rule 231 signs without Slow Speed indication in MCS mode?

The required action when encountering Rule 231 signs without Slow Speed indication in MCS mode is to comply with Rule 231 and notify the Trainmaster. This option is correct because Rule 231 specifically addresses the operating procedures in situations where restrictions or signals are present on the track. Even in the absence of a Slow Speed indication, it is essential for train engineers to adhere to the established protocols set forth in Rule 231, which may include observing specific speed limits or other operational guidelines.

Notifying the Trainmaster is also a crucial step, as it ensures that management is aware of the situation and can take any necessary actions or adjustments for safety or operational efficiency. This two-part action not only maintains adherence to rules but also facilitates communication and oversight in train operations, which is vital for safety.

Consideration of the other actions reveals why they are not appropriate under these circumstances. Complying solely with local authority directives may overlook specific requirements of Rule 231, and accelerating toward the destination disregards safety protocols that could lead to unsafe conditions. Switching to MATC mode without proper justification does not address the obligation under Rule 231 and may not be pertinent to the situation presented. Thus, following Rule 231 and informing the Trainmaster is the most comprehensive and