Once try to board it on these dates ! Then You will get to know about a top secret window called as " Current Booking " ! Then you may understand that few routes totally depend on current ! BBN JS also has 1000+ seats available every other day but on journey date you may not even get to sit on your own seat because of the sudden rush for people like you who dont even know about tactics of the locals for a train in their area and start to judge it from a distant place !! :)