What should crews do when a signal is found to be malfunctioning?

When a signal is found to be malfunctioning, the appropriate action for crews is to stop and report the signal issue. This procedure is crucial because malfunctioning signals can lead to dangerous situations or accidents if not addressed. Reporting the issue ensures that the proper authorities are notified so that they can investigate and correct the malfunction. It also helps maintain overall safety on the rail network by preventing reliance on signals that may not be functioning as intended.

Taking no action, such as ignoring the signal or proceeding with caution, compromises safety and can lead to misunderstandings regarding train movements. Manual adjustments to the signal can also pose risks, as they may not be made in accordance with established protocols and safety measures. Therefore, stopping and reporting the malfunction is the most responsible course of action, ensuring that safety protocols are followed and that the issues can be rectified promptly.