I once took this train. It had a scheduled arrival at Chhapra nearly three at night. The CPR-MTJ express starts two hrs later than this and has an arrival time before this at GKP [ though it arrived few minutes late that day after Purvanchal].
I have travelled in GD-ASN, with which ASN-GKP has an RSA with. That train was quite clean despite starting and ending at well, in the middle of nowhere.