The required maximum MPH when the engineer pulls up to inspect after a hot wheel or hot journal detector is:

• A. 10
• B. 5
• C. 15
• D. 20

Answer: (A)

When a hot wheel or hot journal detector trips, the train must be pulled up for a careful inspection at a controlled, reduced speed. The maximum allowed speed for this inspection is ten miles per hour. This limit provides a safe margin so the crew can observe wheel and bearing conditions, check for overheating, and stop again quickly if needed. Going faster could miss developing problems or cause further damage, while going much slower would unnecessarily delay operations. Once the inspection is complete and clearance is given, the train can resume normal speed.