How are railroad tracks connected?

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Tags

1. #fixed
2. #europe
3. #gravel
4. #steel
5. #railroad
6. #parallel
7. #apart
8. #sleepers
9. #track
10. #loose
11. #concrete
12. #distance
13. #ballast
14. #which
15. #connected
16. #called
17. #usually
18. #gauge
19. #consists
20. #other
21. #bolted
22. #rails