What action should a pilot take on observing a double red signal?

When a pilot observes a double red signal, the appropriate action is to stop and wait for further instructions. A double red signal indicates that the train must come to a complete stop, as it signifies that the track ahead is not clear or it is unsafe to proceed. This is a fundamental safety protocol to prevent accidents and ensure the safety of both crew and passengers.

Stopping at a double red signal allows the pilot to assess the situation further before proceeding. It is crucial to wait for permission or instructions from dispatch or signal control, as they will provide the necessary guidance for when it is safe to move again. This ensures that the train operates within regulations and maintains safety standards.

Other actions, such as proceeding with caution, clearing the signal, or calling for confirmation, do not align with the established protocols for responding to a double red signal. Following the correct procedure is vital for maintaining a safe and efficient railway operation.