How can a train pull so much weight?

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Tags

1. #correct
2. #necessary
3. #train
4. #locomotives
5. #cooling
6. #often
7. #tracks
8. #extra
9. #auxillary
10. #weight
11. #horsepower
12. #amount
13. #avoid
14. #bankers
15. #heavy
16. #motor
17. #motors
18. #selecting
19. #forced
20. #heaving