List of most frequently used short form in Indian Railways and their full form:
1A: First class Air-Conditioned (AC), First AC
2A: AC in two tear sleeper class
3A: AC in three tear sleeper class
FC: First Class
3E: AC in tier economy
CC: AC in chair car
SL: Sleeper class withour AC
2S: Second Sitting class
PNR: Pessenger Name Record, this is a ten digit number used to keep records in the database of a computer reservation system (CRS) that contains the itinerary (a planned route or journey) for a passenger, or a group of passengers travelling together.
RAC/RC: Reservation Against Cancellation
GN: General Quota
LD: Ladies Quota
HO: High Official quota
DF: Defense Quota
PH: Parliament House Quota
FT: Foreign House Quota
DP: Duty Pass Quota
CK: Tatkal Quota
PT: Premium Tatkal Quota
SS: Senior Citizen/Travelling Alone/Female above 45 years
HP: Handicapped (Physically) quota
RE: Railway Employee Staff on duty for the train
GNRS: General Quota Road Side. This code is used for those railway stations that are still not connected to PRS (Passenger Reservation System).
WL: Waiting List. Meaning that the ticket is still not get confirmed.
CNF: Confirmed, issued only when you’ll get confirmed birth.
GNWL: General Waiting List
GNWL/AVAILABLE: Ticket is confirmed and seat will be allotted of final chart.
RLWL: Remote Location Waiting List means the confirmation of the ticket depends on intermediate stations between starting and terminating stations. Because the remote location stations prepare there final chart before 2-3 hours of the actual departure of the train.
PQWL: Pooled Quota Waiting List
RLGN: Remote Location General Waiting List
RSWL: Roadside Station Waiting List
RQWL: Request Quota Waiting List
CKWL: Issued when there is waiting list on tatkal booking.