Do airlines hav Tatkal? If its ARP been made for 3 months, it dnt will remain as an option for the one who look for confirm berth at last moment,,,,
Further, airlines start wth minimum fare whch triples wth the date becoming closer to travel one,,,while IR isnt into this kinda game play...
With 15 days ARP and premium fare, its more chance that the run may go without much revenue, if nt enough booking happens,,,,Its easier for IR to open booking for 30 days r 2 months along wth PRS booking option...
more... and jampack it wihout making premium charged,,,bt still IR makes the train wih minimum slot for booking n offering ones to get train booking, whose price still nowhere match with last minute airplane fare,,,,it costs sme 10-15000+ for airfare, in last festival season booking,,for mumbai-LKO..