What is a shunt signal?

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Tags

1. #ground
2. #miniature
3. #different
4. #indicate
5. #clear
6. #level
7. #ahead
8. #proceed
9. #purposes
10. #signal
11. #function
12. #semaphore
13. #shunting
14. #movements
15. #mounted
16. #signals
17. #distinct
18. #their