What is indicated by a Clear Signal in 261 territory?

A Clear Signal in 261 territory indicates that trains are authorized to proceed safely without restrictions. This means that the track ahead is clear and free from any obstacles, allowing the train to maintain its maximum allowable speed. It's crucial for train crews to follow these indications for operational safety and to ensure efficient train movements.

While other choices highlight important operational procedures in different contexts, they do not accurately reflect the meaning of a Clear Signal. For example, "Proceed with caution" suggests a need for vigilance due to potential hazards, which does not apply under a Clear Signal condition. Similarly, options indicating to stop or to obtain permission are related to signals that require either slowing down or halting, thus contradicting the concept of a Clear Signal, which provides a straightforward instruction for unimpeded movement.