SL – Sleeper class: This is the widely used coach being used. It has either 72 seats (in normal trains) or 78 seats (Duranto trains) with 6 seats on one side and 2 seats on the opposite sides. This is a budget-friendly coach for the major category of passengers.
1A – AC First Class: This is the most comfortable and air-conditioned coach as far as privacy is concerned in Indian trains as well as this is the most expensive coach, sometimes costlier than the airfare too. Bedding is included in the fare. This has either 18 or 22 seats. Food, beverages are sometimes included in the fare, depending upon the train you are traveling in. Berths are for night and seats are for the day.
2A – AC Second Class: This is another air-conditioned and comfortable coach with berths. Bedding is included in the fare. It can carry either 46 or 52 passengers. Food, beverages are sometimes included in the fare, depending upon the train you are traveling in.
3A – AC Third Class: This coach has the same seating arrangement as SL. Apart from this, it provides bedding, for which the cost is included in the fare.
2S – Seater Class: This coach has the same seating arrangement as CC, but this does not have the AC facility and has bench-style seats. This is generally preferred for day travel. This can carry 108 passengers.
CC – AC Chair Car: This coach does not provide the facility of sleeping, there are no berths. Passengers need to travel on chairs. Thus, quite okay for 4-5 hours journey, however, passengers do travel for overnight journeys too.