What is the maximum speed for locomotives with single or adjoining flat spots over two inches?

The maximum speed for locomotives with single or adjoining flat spots over two inches is established to ensure safety and minimize the risk of structural damage to both the locomotive and the track infrastructure. When flat spots occur on wheels, they can create an uneven distribution of weight and lead to excessive vibration and instability while in motion.

By setting the maximum speed at 10 MPH, it allows for safe operation while minimizing the potential for further damage to the train and the tracks. This speed limit is crucial for maintaining safety standards and preventing accidents that could arise from mechanical failures or derailments due to the compromised condition of the wheels.

The other speed options, while lower, do not provide a balanced consideration between safety and operational capability for locomotives experiencing this specific issue. Therefore, 10 MPH serves as a reasonable compromise in this situation.