What is the required action if flat spots are adjoining and at least 2 inches long?

When flat spots on wheels are adjoining and at least 2 inches long, the required action is to set out at the first available point. This measure is necessary because flat spots can significantly affect the safe operation of a train, leading to potential mechanical failure, increased wear on the wheels and tracks, and safety hazards during operation.

Addressing this issue promptly by removing the train from service helps prevent further damage and ensures safety for both personnel and equipment. Operators may observe that flat spots can lead to vibrations, noise, and decreased braking efficiency, all of which compromise the integrity of the train's performance and safety.

By setting out at the first available point, maintenance personnel can then inspect the wheel conditions closely and take necessary repairs or replacements, ensuring that the train is safe for continued operation.