A 3-tier AC in Indian trains refers to an air-conditioned coach with three tiers of bunks - upper, middle, and lower on one side and two bunks on the other side of the aisle. It is the cheapest of the air-conditioned options and is more crowded than 2AC. The seating arrangement is 3x2, which means there are three seats on one side and two on the other side of the aisle. The coach has 64 sleeping berths, and bedding is provided for overnight trains. The gangways are not curtained off, and there are no reading lights for each berth. However, some coaches have individual vents for each berth, foldable snack tables in both longitudinal and transverse bays, injury-free spaces, and holders for water bottles, mobile phones, and magazines. The washrooms have normally very clean Western and Indian style toilets, but their usability decreases depending on how the other passengers use them.