If you want to travel from kolkata to darbhanga or this inner part of bihar or vice-versa, then this weekly is the best train. Other trains like doon exp, mithila exp are very poor in terms of crowd and speed. This trains gets a dedicated tte for the whole journey. Its having least possible halts. Only glitch i felt is the food availibility enroute and odd arrival at howrah. Instead if it is made to depart DBG after 1700hr, then it could arrive HWH by 0430hr or 0500hr which would be great. But still speed is great during night time. Also ticket are generally always available. Last moment travellers can get tickets easily. While departing darbhanga, my coach was nearly empty.