Though People have suggested here for Purushottam Express.. But they havent said that it does not have OBHS facility. Coaches becomes messed up, be it SL or AC ( 3A and 2A both ) after CNB and no one cleans the coaches. A little relief will come only at MGS, not even at ALD. So travel in it, if you are ok with the garbage and all the dirt around. Travelled thrice in AC coaches and hence the personal experience