Which signal indicates a train should proceed at normal speed?

The signal that indicates a train should proceed at normal speed is the clear signal. This signal is specifically designed to convey to the train crew that the track ahead is clear and safe for the train to continue its journey without any need to reduce speed. The clear signal ensures that the train can operate at its authorized maximum speed, allowing for efficient transit and timely arrivals.

In contrast, the stop signal directs the train to halt immediately, indicating that the track is not safe for passage. A caution signal warns of potential hazards ahead, prompting the train to be prepared to slow down or stop if necessary. Lastly, the restricted signal conveys that the train must operate under reduced speed due to track conditions or other restrictions. Understanding these distinctions is essential for maintaining safe and efficient train operations.