12650 KSK is one train which would give you immense thrill by high speed rides in the beginning and gradually the speed as well as the thrill dies away, enjoy NZM-JHS, while DMM-YPR would surely be a pain to endure at the end of such a long journey.(4.15hrs for 175 kms is almost par with many passenger trains) but the busy SWR stretch between DMM and YPR slows down this superfast very badly, rarely arrives on time at YPR, minimum 15-30 minuts delay, and could get worse.