What should an operator be prepared to do when seeing a RED/RED/YELLOW signal?

When an operator encounters a RED/RED/YELLOW signal, it indicates a specific state where caution is necessary. This type of signal generally means that while one track or route is halted (represented by the red signals), there is an indication of clearance with the yellow signal, suggesting the possibility of movement in a controlled manner.

This situation typically requires the operator to proceed with caution and remain prepared to stop. The yellow signal serves as a warning that changes may occur, such as a switch in track or an approaching train, making it crucial for the operator to stay alert and ready to react accordingly. By proceeding with caution, the operator can maintain safety while being prepared to stop if the situation changes. Thus, readiness to respond to a potentially dangerous situation is imperative in this signaling scenario.