End-to-End berth may remain empty for many trains, whch isnt unusual as for so long distance journey, Quota defined always is much thn regular lean period demand & people find flight as cheaper & faster option (as compared to such long distance journey)!!
If u chck end-to-end, u gonna find Karnataka, Tamilnadu, SBC Raj, MAS Raj ....... so long list whch will give vacant berth!!