What will the Dispatcher do when informed about the first train receiving a temporary speed restriction?

The Dispatcher plays a crucial role in maintaining safety and communication within the rail system, especially when it comes to speed restrictions. When the first train receives a temporary speed restriction, the Dispatcher must ensure safety protocols are followed.

Keeping blocking protection until the first train and the next four trains have possession reflects a safety-oriented approach. This means that the Dispatcher ensures that any subsequent trains are aware of the restriction and are safely managed, preventing any unwanted incidents due to multiple trains operating under potentially unsafe conditions. This set procedure helps to maintain the integrity of the rail network by ensuring all trains are under control and aware of the current restrictions in place.

The other options do not align with the need for safety and clear communication in this scenario. Allowing trains to proceed without restrictions could lead to dangerous situations if they are not informed of the speed limitation. Removing restrictions immediately would not allow for an adequate adjustment period for the crew and could also lead to safety breaches. While informing the crew on duty of the changes is important, it does not ensure the continued protection of all trains in transit as the blocking protection does. Hence, maintaining blocking protection until the first train and the next four have possession is the most prudent course of action.