once when i was travelling in mangala exp a few yrs back and we were late at RN at 17.00 and we were2.15 hrs late..............then ERS WDM3a put up a terrific show and reached us bang on time at MAO............distance of 235 kms in flat 2 hrs 15minns.........flat 109.30 kmph avg speed..........this is one of a kind instance and not a regular scene in KR