1) Just like WL/Available, RAC/Availabile may be found at times.
2) WL/Available is not to be confused with Available X (Where X>=1)
3) Simple reason why the number of berths available is not displayed beside "Available" in the status "WL/Available"
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a)...
more... Let us consider train goes from A-B-C
b) No RAC Defined.
c) 100 berths defined for ARP
d) All of the 100 berths got booked - 50 WL'ed tickets got booked - Current Status WL 50
e) 55 passengers (5 Confirmed + 50 WL) cancels their ticket.
f) Ideally there can be 5 available seats.)
g) Now I want to book 5 tickets for A-B whereas the 5 confirmed passengers who had cancelled their tickets; 4 of them held the berths for A-C while only one had confirmed berths for A-B
h) Thus, I would be lucky enough just to get that 1 berth after which the status would again move back to WL. (Here, displaying WL/Available 5 would result in anomaly)
i) Later, any further bookings for A-C (As it would move to WL) would see clearance (Atleast for that 4 Confirmed and then Cancelled berths) during chart preparation.