automatic block signal system造句
- The investigation recommended that the Automatic Block Signal system be extended across the whole of the route.
- 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.
- It's difficult to find automatic block signal system in a sentence. 用automatic block signal system造句挺难的