automatic block signal system in a sentence

1. The investigation recommended that the Automatic Block Signal system be extended across the whole of the route.
2. During the 1950s and 1960s the Montauk Branch Kew Gardens ( Richmond Hill ) train collision, the railroad began to install an Automatic Speed Control system to supplement ( and later replace ) the wayside automatic block signal system on a majority of its lines.
3. It's difficult to find automatic block signal system in a sentence.