If a Class 8 track has not been used for more than 8 hours, what is the maximum speed a train may operate on that track before resuming maximum authorized speed?

The maximum speed a train may operate on a Class 8 track that has not been used for more than 8 hours is set at 100 MPH. This restriction is in place due to safety considerations, particularly the potential for track conditions to change during periods of inactivity. When a track is idle for a certain amount of time, factors such as temperature, weather, and natural settling can affect its integrity and condition. As a result, limiting the speed to 100 MPH helps ensure that trains can respond safely to any unforeseen issues, such as debris or minor track distortions, that may have developed over the idle period.

The goal is to minimize risk while still allowing for efficient movement where it is safe to do so. Train operators are trained to adhere to these guidelines to maintain safety standards and optimize operations in varying conditions.