What should be done if the same car actuates two consecutive hot boxes and no defects are found?

When a car actuates two consecutive hot boxes, it raises a significant safety concern, even if no defects are subsequently found during inspection. The appropriate response is to limit the train's speed to 10 mph for the next 5 miles. This is a precautionary measure intended to ensure that any potential issues are identified before they can escalate into a more dangerous situation. By reducing speed, it allows for safer operation of the train and gives additional time to assess the integrity of the affected components.

In this case, proceeding at normal speed could compromise safety if the underlying problem has not been diagnosed, while inspecting only the defective car does not address the fact that there may be unseen issues with other parts of the train. Additionally, notifying only the train conductor does not ensure that all necessary personnel are informed to take appropriate action for the safety of passengers and crew. Hence, maintaining reduced speed is the best option to prioritize safety and address the risks associated with the earlier notifications of hot box activity.