After having so much slack in timetable now, which is equivallent to troll so i don't think there is any more scope left to troll this train anymore, In 12350 I was frequent traveler in 2012-2016 even once we were together on this train but that was 12349 so with my personal experience i can tell you other than NCR regular troll DNR trolled it badly on day I was travelling with 12350 , it also happened on other days too but I can't guarantee if one disagree that on their run with this train that it wasnt trolled by dnr, but yes 2-3 hrs of delay and even 4hrs and more delay at time of winter after ddu till bgp was added to delay carried from NCR. Only once I reached Bhagalpur with just 10 min delay.