When passing a signal requiring movement at restricted speed, what must the train do until its leading wheels pass the next governing signal?

When passing a signal that requires movement at restricted speed, it is essential for the train to proceed at restricted speed until its leading wheels pass the next governing signal. This requirement is in place to ensure safety and allow for proper braking and stopping distances in case of any obstructions or hazards on the track.

Restricted speed is defined as a speed that allows the train to stop within half the distance of visibility ahead, which is critical when operating in areas where signals or track conditions may not permit faster movement. By maintaining this speed, the crew can respond appropriately to any unexpected situations.

In contrast, moving at maximum speed or increasing speed gradually would not be safe, as it could lead to a situation where the train cannot stop in time if an obstruction or a signal change occurs. Stopping immediately is also not practical unless explicitly required, as sudden stops can be dangerous and may cause disruption or derailment. Therefore, the correct practice is to maintain restricted speed until the leading wheels are past the next governing signal.