What is required before passing a Stop Signal?

Passing a Stop Signal requires a comprehensive approach to ensure safety and compliance with operational protocols.

First, assuring that blocking devices are applied is essential to prevent unauthorized movements in the vicinity while a train is passing a stop signal. These devices act as physical barriers that keep trains from encroaching on sections of track where they should not be.

Secondly, it is critical that all affected appliances, which may include switches, signals, and other equipment, are properly positioned. This positioning ensures that the train can safely proceed without encountering hazards or conflicts with other rail operations.

Finally, confirming that no opposing movements are authorized is crucial. This precaution ensures that there are no trains or vehicles permitted to enter the same track section in the opposite direction, which could lead to dangerous situations.

In summary, all three requirements must be met—blocking devices in place, proper positioning of affected appliances, and authorization checks for opposing movements—to facilitate a safe and orderly procedure for passing a Stop Signal. Therefore, the correct answer encompasses all these elements, reflecting the integrated safety measures required in railway operations.