happens only in winters..
Its 2014 tip and then SK was known for its late - lateefi. The worst phase of SK which I hav seen is 2010-2012. 7 days of the week it was rescheduled from both ends and almost twice-thrice in month it used to be cancelled. Situation improved from 2014 summers and by 2015 it has become the most reliable train b/w PNBE-NDLS-PNBE after Rajdhani.