What is the meaning of 2s in train?

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Tags

1. #flights
2. #lowest
3. #class
4. #means
5. #short
6. #shatabdi
7. #where
8. #benches
9. #common
10. #found
11. #cushion
12. #layout
13. #seats
14. #second
15. #usually
16. #distances
17. #preffered
18. #chair
19. #seating
20. #similar
21. #trains