The classification and light sequence of the signal machine
1, The station signal machine: Yellow ,green, red, yellow and white
2. Outbound signal machine:
Automatic block: Yellow ,green, red, yellow and white
Semi-automatic occlusion: Green, red
3. Road signal machine : Yellow ,green, red, yellow and white
It is divided into: train route and train route
4. Through the signal machine:
Three display: Yellow ,green, red,
Four display : Green, red, yellow
5. Preview signal machine:
Automatic block (as by a signal machine)
Semi-automatic block ：Green, red, yellow
6, Hump signal machine ：Yellow and green, red and white
7. Shunting signal :Blue, white
8, Repeating signal machine
Station repeating: (usually three white lights, showing two white to be opened, not shown to be closed).
Out of the station: (green)
9, Block signal machine: (red)
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