When moving at restricted speed, what must the crew keep a lookout for?

When moving at restricted speed, the crew must keep a lookout for broken rail. This is crucial because restricted speed is implemented to ensure safe operation in situations where visibility is limited or where there may be unexpected hazards along the track. Keeping an eye out for broken rail allows the crew to react appropriately to any track defects that could potentially lead to derailments or accidents.

While other hazards like passengers on the track, road work signs, and the presence of other trains are important to monitor, the specific focus on broken rail emphasizes the need for heightened vigilance regarding the integrity of the track itself when operating under these conditions. Understanding that the safety of the train relies heavily on the condition of the rail and the immediate environment enhances the crew's situational awareness and decision-making capabilities.