Indian Railways use the following letters to identify their carriages.
H = 1st class air con (1A)
E = Executive Chair Class (air con)(EC)
A = 2-tier air con (2A)
B = 3-tier air con (3A)
C = Air Con Chair Car (CC)
FC or F = First Class non air con (FC)
S = Sleeper Class (SL)
D = Bookable 2nd class seat (2S)
HA = 1st class air con/2-tier air con combination
AB = 2 & 3 tier air con combination
G & J are used for Garib Rath trains, G for 3 tier air con, J for Air con Chair Class
E = Executive Chair Class (air con)(EC)
A = 2-tier air con (2A)
B = 3-tier air con (3A)
C = Air Con Chair Car (CC)
FC or F = First Class non air con (FC)
S = Sleeper Class (SL)
D = Bookable 2nd class seat (2S)
HA = 1st class air con/2-tier air con combination
AB = 2 & 3 tier air con combination
G & J are used for Garib Rath trains, G for 3 tier air con, J for Air con Chair Class