I've got one of these in long-term storage (pretty much since the 70's, consequent to the arrival of the Mainline model, along with a Class 47!) - but I utilised MTK's own power bogies. They had a novel design utilising a layshaft that enabled 3-axle drive (or, by omitting the layshaft, unpowered) and pickups incorporated with the brass axle bearings. I'm sure that with a bit more work they would have performed well, but they never quite did for me - the frames, layshaft and gears were moulded in a greasy sort of plastic, which was probably not ideal.
The Class 47 was powered by twin K's motor bogies which generally spun on the spot without much movement on the track.
On Wright Writes there is a photograph of my MTK Class 03, which was much more successful (until the Mainline version, again).
Like many others, I learned a lot from building MTK kits...
Anyway, back to the original topic...
Mark