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.