What does complying with posted speed signs under Rule 231 entail?

Complying with posted speed signs under Rule 231 entails following the posted speed sign regardless of other indications. This means that the speed signs are a primary directive for train operations, and engineers must adhere to them to ensure safety and operational efficiency. These speed limits are established to maintain safe train movements based on track conditions, nearby structures, and potential obstacles.

Following the posted speed sign ensures that the train operates within safe parameters, which is critical to preventing accidents and maintaining the integrity of the rail system. While there may be other signals or indications that could suggest different speed levels, the rule emphasizes the importance of the posted signs as a standard that must be followed without exception, ensuring a consistent safety protocol across all areas of the track.