When is normal operation allowed to resume?

Resuming normal operation is primarily contingent upon ensuring that the system operates correctly and safely. A speed indicator showing a correct speed is a fundamental requirement because it directly relates to the safe and effective operation of the trains. This indicator is crucial for determining whether trains are operating within safe speed limits, which is vital for preventing accidents and ensuring the safety of all operations.

While verbal confirmation from a Dispatcher, written reports, and mechanical maintenance checks are all important components of operational safety and protocol, the immediate resumption of operations directly hinges on the functionality of the speed indicator. If the speed indicator is reporting accurately, it provides assurance that other systems can operate as intended without risk, allowing operations to resume.