Cheers Alan, I wondered how it would run... now I know.
I'm the proud owner of 2 Hornby OO Live Steam locos and the tiny double acting cylinders on them are a treat to watch (and listen to!).
If you have 2 mins to spare, you can watch my old Mallard vid here:
YouTube - More live steam....
The layout has changed somewhat in the more recent ones. It's nearly on par with your engineering quality
. < big joke!
Tom