R=> RAC
S=> Sleeper
2=> Coach No. 2
The passenger has been alloted a seat (not a full berth) in a Sleeper Coach; having coach number as S2. The seat No. should be given...
more... beside RS2 and he has to share this seat with another co-passenger. If the TTE finds any vacant berth, either of you would be allotted that empty berth, and the other one would have this entire berth in his possession.