I'm not sure EMUs count?
If you count EMUs, then my best EMU trip would be the nearly record breaking non-stop (69 minutes!) run from Dover Priory to London Victoria on 30 December 2004 on a 12CEP! (was that really a YEAR ago?!

hock: )
But my best 'haulage' would have to be Newport to Manchester on a 47 on 30 May, it was a Footex and enthusiasts had avoided it as they were worried about the footy fans. In fact, it was only Preston North End so nothing to worry about. I got the front right window for the entire journey until it got dark at Stockport, and there were no other enthusiasts on the train, no 'competition' for the window

. We left late but caught up time, a very fast run. A gloriously sunny evening, couldn't believe my luck!
Nothing can beat a trip from Fort William to Edinburgh on the (still!) Class 37 hauled Caledonian Sleeper on a fine Summers evening though. And the best thing about it? I can go again a few times next Summer. Sorry, EWS - you lose! Bring it on!