What must the engineer do when the distant signal is visible?

When the distant signal is visible, the engineer must verbally communicate the signal aspect. This action is crucial as it ensures that all members of the crew are aware of the train's movement status and operational instructions. Clear communication about the signal aspect helps to maintain safety and reduce the risk of misunderstandings among crew members, especially when approaching junctions, grade crossings, or other points of interest on the railway where the signal aspects have a direct impact on train operation.

Verbal communication serves as a confirmation process that allows the conductor and any other team members to understand the train's current status and prepare for the next operational steps. It fosters teamwork and coordination, which are essential for safe train operations.

Understanding this process emphasizes the importance of communication within the crew when it comes to safety protocols on the railway. The other options do not accurately reflect the protocols related to responding to a visible distant signal.