When should the operation of the ATC Bypass mode be reported to a supervisor?

Reporting the operation of the Automatic Train Control (ATC) Bypass mode to a supervisor is critical whenever a safety issue arises. This is essential because the ATC Bypass mode may be an indication of a fault or an operational anomaly that could potentially impact the safety of train operations. By promptly informing a supervisor, a team can assess the situation, ensure that appropriate safety protocols are followed, and determine if any additional actions are necessary to mitigate risks.

It is important to maintain open lines of communication regarding safety-related matters, as these often require immediate attention and corrective action. The other options do not emphasize the immediate relevance of safety in operational practices, lacking the urgency or the proactive approach necessary when dealing with potential safety issues in train operations.