During a Class I brake test, what is the maximum speed allowed for conducting a "roll-by" inspection?

In a Class I brake test, the maximum speed allowed for conducting a "roll-by" inspection is 10 mph. This speed limit is important to ensure that the inspection can be performed safely and effectively. A roll-by inspection involves observing the train as it rolls past the inspection point, allowing personnel to check for proper operation of the brakes and other critical components without having to stop the train.

The choice of 10 mph strikes a balance between allowing the inspector enough speed to gather insight into the train's braking function and maintaining safety for both the inspector and the crew. Exceeding this speed could increase the risks associated with the inspection, making it harder to notice issues in a quick moving train. Other speeds like 5 mph, 15 mph, or 20 mph could either be unmanageable in a practical inspection scenario or might not allow enough time for a thorough check of the train's brake systems. Therefore, the specified 10 mph ensures that the inspection is conducted within a safe and practical range, thereby upholding safety standards.