What is the maximum allowable speed for a locomotive with a failed speed indicator to travel?

The maximum allowable speed for a locomotive with a failed speed indicator is set at 20 MPH to ensure safety and mitigate the risk associated with operating a train without a functioning speed indicator. This limit reflects the imperative to maintain control and reduce the potential for accidents or derailments, especially in situations where the engineer cannot accurately monitor the speed. Operating at a lower speed allows for better reaction times to any unforeseen circumstances on the track and ensures that the train can safely navigate through various operating conditions.

The choice of 20 MPH aligns with regulatory guidelines that prioritize safety and reliability in train operations, emphasizing the importance of adhering to these protocols to protect crew, cargo, and infrastructure.