Various quotas for Indian Railway ticket bookings
|Quotas in Indian Railways|
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.
Source : http://www.indianrail.gov.in