What is the maximum speed allowed for a car with a 3-inch flat spot on the wheel?

The maximum speed allowed for a car with a 3-inch flat spot on the wheel is 10 mph. This limit is established to ensure safety and prevent further damage to the wheel and the rail. A flat spot can cause vibrations and instability at higher speeds, which could lead to loss of control or derailment. Maintaining a lower speed minimizes these risks and allows for safe operation while the issue is addressed.

Understanding this limit is crucial for train operators and maintenance crews to ensure safe transport conditions, especially when dealing with the integrity of the rolling stock. Proper monitoring and adherence to speed restrictions help maintain operational efficiency and safety on the railroads.