How do train signals work?

Related questions

1. Do trains have traffic lights?
2. How do automatic train signals work?
3. What is wayside railway?
4. What is a shunt signal?
5. What is moving block system?
6. How does Indian Railway Signal work?
7. What do train signal lights mean?
8. When approaching a railroad crossing with flashing lights you must?
9. What is calling on signal?
10. What's a red signal on a train?

Tags

1. #primarily
2. #track
3. #always
4. #entrance
5. #placed
6. #block
7. #allow
8. #trains
9. #signalling
10. #ensure
11. #train
12. #front
13. #achieved
14. #sections
15. #there
16. #blocks
17. #provided
18. #before
19. #following
20. #railways
21. #between
22. #signal
23. #space
24. #enough
25. #protected
26. #dividing