Question: what is the difference between two tier and three tier ac in trains?
Answer: AC 3 Tier (3 AC) It has three tiers of bunks – upper, middle and lower on one side and two bunks on the other side of the aisle. It's more crowded than 2 AC, and lacks the privacy curtains and individual reading lights found in 2 AC. You are still provided with bedding for overnight trains.