What is the limit speed when a locomotive has flat spots that meet specific criteria?

When considering the limit speed for a locomotive that has flat spots meeting specific criteria, the correct choice is 10 MPH. This limit is formulated based on safety regulations and operational guidelines aimed at protecting the integrity of the locomotive and its components. Flat spots on wheels can lead to imbalances and vibrations that might compromise the safety and performance of the train if operated at higher speeds.

The 10 MPH limit ensures that the locomotive can be operated safely while allowing for necessary inspections and repairs to be conducted. This speed helps mitigate the risk of accidents or additional damage that could result from higher-speed operation under these conditions. It's crucial for personnel to be aware of these specific operational limits to maintain safety standards throughout their duties.