What action must crew take if a train encounters a safety hazard?

When a train encounters a safety hazard, the appropriate action is to stop the train and assess the situation. This immediate response is crucial because the safety of the crew, passengers, and the train itself is the highest priority. By stopping, the crew can evaluate the nature and seriousness of the hazard, determine whether the train is damaged, and decide the next steps to address the issue. This proactive approach helps prevent further complications or accidents that might occur if the train were allowed to continue moving while a hazard is present.

The other choices, while they suggest taking some action, lack the immediacy and caution required in hazardous situations. Delaying the report of the hazard until after completing the run could risk safety and prevent timely intervention. Notifying passengers while continuing without stopping does not address the immediate threat and could lead to unsafe conditions. Calling maintenance during the next stop, similar to reporting the hazard later, does not prioritize the urgent assessment needed to ensure safety at that moment.