When should a defective speed indicator be reported?

A defective speed indicator should be reported when it fails to indicate speed accurately because the primary function of this device is to ensure the safe operation of the train by providing real-time feedback on speed. If a speed indicator is not displaying the correct speed, it poses significant risks for safe train operation, leading to potential accidents or infractions of speed limits. Ensuring that all indicators are functioning correctly is essential for the safety of the crew, passengers, and cargo. Prompt reporting allows for timely repairs and maintenance, keeping the railway system safe and efficient.

The focus is on the safety and reliability of train operations, making it critical to address any inaccuracies in speed measurement immediately rather than waiting for scheduled maintenance or ignoring intermittent issues.