What does the yellow over lunar signal aspect indicate?

The yellow over lunar signal aspect indicates that the train should proceed prepared to pass the next signal at restricted speed. This signal serves as a warning to the engineer that the upcoming signal may not indicate a clear path and that they need to be ready to slow down and approach with caution.

Understanding this signal aspect is crucial for maintaining safety on the rails. When a yellow over lunar is displayed, it tells the crew to be vigilant and prepare for a potential change in the status of the track ahead, ensuring that they are ready to respond appropriately to the conditions and potential hazards. This aspect plays a key role in signaling protocol, helping to prevent accidents and ensuring the safe operation of trains as they approach sections where they may need to slow down significantly or stop entirely.