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The semi semi-automatic closing interval, the long train head over the outbound signal generator (the track circuit not on the outbound side of the station).
Secondly, in case you are really gonna try to repair that scratched DVD then there is nothing strange, technical or mystical regarding the process. DVDs, CDs and Game Discs are made from a hard clear plastic called polycarbonate. The repair of scratched DVDs is nothing greater than a workout in polishing or re-surfacing an item of polycarbonate plastic. So in the event you are feeling somewhat nervous about attempting it. . . relax!
Wide provided suitable for busy trunk, also can be laid in tunnel and station floor maintenance difficulties, stone or soil subgrade are laid, but the mud pumping in the diseases of roadbed must be laid on the roadbed diseases after renovation. The main advantages of the wide sleeper circuit are: the suborbital sinking is small. The vibration acceleration is smaller than the concrete sleeper line, which gradually slows down and stops after laying. So the line maintenance work is greatly reduced, about a third of the general concrete sleeper line. The track is easy to keep clean. Dirt is not easy to break into the bed and prolong the repair cycle of the route. The line is smooth and stable, which is conducive to high-speed operation and the laying of seamless circuit. The disadvantage is that the cost is higher, and it is more difficult to change the shop on the busy trunk line
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