2A- Second Class AC Sleeper ClassThe 2A compartment is the Second Class AC, simply 2A, AC 2 -Tier sleeper etc. Regardless of what people call this compartment, on the train, it will always be mentioned as 2A.
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Second seater: 2S Second Seating, lowest class where the seats are in form of benches may or may not be with cushion.
3AC coach is the most basic type, with three berths (beds) in a compartment.It does not have a separate seating area like 2AC and 1AC coaches do. 2 AC coach has two berths and a separate seating area, while 1 AC coach has one berth and a separate seating area. All these coaches have air-conditioning facility.
AC (1AC, 2AC, 3AC, CC, EC) coaches are definitely much more safer than Sleeper coaches, because: 1. The fellow passengers are usually educated, well behaved, mannered and to be specific helpful. Generally, one can find families with kids or business class people traveling in AC coaches.