What is the difference between AC 2 tier and 3 tier?

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Tags

1. #privacy
2. #difference
3. #middle
4. #upper
5. #there
6. #coach
7. #curtains
8. #coaches
9. #short
10. #absence
11. #berth
12. #tiers
13. #cabin
14. #seats
15. #three
16. #berths
17. #lower