but sir....on cancelling he wont get his full money backk....he'd b charged sum cancellation fee..and also tatkal charges..these both contribute 2 at the max 100 rs..i did the same way when i wanted 2 travel from pune 2 durg..bt due 2 a high waiting list ..i purchased a tatkal ticket(from pune 2 hwh)...and 2 my surprise my ticket of pune-durg was confirmed..andthen i cancelled the tatkal ticket..wcih total refunded me 85 rs