What does a yard jockey do?

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Tags

1. #locomotive
2. #terminal
3. #jockey
4. #within
5. #states
6. #shunt
7. #facility
8. #intended
9. #horse
10. #tractor
11. #warehouse
12. #united
13. #switcher
14. #truck
15. #spotter
16. #spotting
17. #trailers
18. #cargo
19. #intermodal
20. #known