What should a crew member do if the whistle fails and is the lead unit cannot be changed?

If the whistle fails and the lead unit cannot be changed, it is crucial for the crew member to take appropriate safety precautions to ensure the safety of pedestrians and vehicles at public crossings. Stopping the train before each public crossing and providing ground warning is the most reliable method to mitigate the risk associated with the lack of audible warning that a functioning whistle would provide.

By stopping the train, the crew can visually assess the crossing and ensure that it is safe to proceed. Providing ground warning assists in alerting anyone near the crossing of the train's approach, which is vital in preventing potential accidents. This practice aligns with safety protocols designed to protect both crew members and the public in situations where standard warning systems are compromised.

Other approaches do not adequately guarantee safety in this scenario. Relying on emergency lights or repositioning the crew does not sufficiently compensate for the absence of the whistle alert. Thus, stopping at each public crossing and actively warning serves as the most effective and responsible response to the situation.