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Quotas in Indian Railways

S. No. Quota Description
1. GN General Quota
2. LD Ladies Quota
3. HO Head quarters/high official Quota
4. DF Defence Quota
5. PH Parliament house Quota
6. FT Foreign Tourist Quota
7. DP Duty Pass Quota
8. tq Tatkal Quota
9. PT Premium Tatkal Quota
10. SS Female(above 45 Year)/Senior Citizen/Travelling alone
11. HP Physically Handicapped Quota
12. RE Railway Employee Staff on Duty for the train
13. GNRS General Quota Road Side
14. OS Out Station
15. PQ Pooled Quota
16. RC(RAC) Reservation Against Cancellation
17. RS Road Side
18. YU Yuva
19. LB Lower Berth
RAC is a special provision to 'split' a berth into two or more seats. This is really speaking not a quota but it is a predefined allocation to take care of the above mentioned special provision.
In case of each road-side station quota, berths/seats are booked by the originating station for journeys up-to the road-side station only up-to the extent of accommodation earmarked for that Road-Side quota .In such cases, distance restriction does not apply. If that berths/seat is redefined from a remote location, then booking can also be done beyond the road side station, within the limits defined for the remote location quota. In no case can a through passenger be given accommodation in the RS berth and the redefined portion. For eg., a passenger traveling from NDLS to MAS cannot be given accommodation in a berth defined as GNRS up-to BPL and subsequently redefined as GN from BPL to MAS.