Where will permanent speed restriction signs be located?

Permanent speed restriction signs are positioned at the proper braking distance from points of restriction to provide train crews with the necessary advance warning. This placement allows the crew adequate time to reduce speed safely before reaching areas where restrictions apply. By being located at appropriate distances, these signs help ensure that trains can comply with speed regulations while minimizing the risk of overspeeding through restricted zones. This strategic placement is crucial for maintaining safety and operational efficiency on the rail network.

The other options do not effectively serve this purpose. For instance, having signs at the front of the train would not give the crew enough time to react, while limiting signs to stations fails to account for all potential points of speed restriction along the route. Likewise, placing them at the start of every journey would not address the specific locations where restrictions actually apply, reducing their effectiveness.