If a hot box detector alarm indicates an axle issue but inspection finds no defect, can the train continue to its destination?

• A. The train may continue to its destination.
• B. The train must immediately stop and report the condition.
• C. The train may proceed at the next schedule stop only.
• D. The train must derail to a siding for inspection.

Answer: (A)

A hot box detector alarm means a bearing temperature was elevated as the train passed, signaling a potential issue. If a careful inspection after the alarm finds no defect and nothing abnormal remains, there is no active hazard to require stopping. In that case, the train can continue to its destination, while the crew reports the incident and notes that the detector alarm occurred and/or any actions taken. The alarm served as a precaution and a trigger to check, but without a defect, continuing is the safe and standard action.

Stopping immediately or derailing to a siding would be warranted only if a definite defect or unsafe condition were found. Proceeding only to the next schedule stop isn’t required when the inspection clears the car, and delaying unnecessarily could affect operations.