How may main tracks within the limits of a manual interlocking be occupied?

In the context of a manual interlocking, main tracks within its limits may be occupied by verbal authority from the control operator. This practice is crucial for ensuring safety and maintaining proper train movements. The control operator has the responsibility to manage the operational environment, ensuring that trains can safely traverse the tracks and that all crew members are informed about the conditions and permissions associated with train movements.

Verbal authority allows for a quick and efficient means of communication, enabling train crews to receive immediate instruction on how to proceed safely. It is essential that this method is used, as it involves direct interaction with the control operator, who has the most current understanding of the situation on the tracks.

Other potential answers do not accurately capture the procedure for occupying main tracks in this scenario. For example, occupying the tracks by written authority could introduce delays that contradict the immediate communication urgency often required in a manual interlocking situation. Automatic signals can indicate train movement permissions under different circumstances but do not apply in a manual interlocking context where human oversight is prioritized. Lastly, allowing any member of the crew to occupy the tracks without permission undermines safety protocols and could lead to dangerous situations.