I believe there is same quota (Pooled Quota) that applies to Mathura/Delhi..
If i book till Ludhiana, I can see it as w/l 5 only instead of w/l 42 but the ticket price rises by 250. So, couple of things here -
1. how does it make diff if i book till mathura or book till delhi
2. if i shell out 250...
more... bucks etc and book pune to ludhiana wl 5 in ac, will it get confirmed?