AC 2 tier has 6 berths in a bay and they are quite wider. It has 2 Lower ,2Upper and a side lower and side upper berths. curtains are provided for berths. Occupancy is lsser(48 per coach) and hence more of space available. 3A is similar to similar clas having 8 berths per bay(Lower, middle and upper+side lower and side upper) and may or may not have curtains. 64 people will be prersent in compartment