Bargain of Doncaster show for me was this E-R Models HO scale monorail.
The 39cm long train comes with an oval of track plus the supports, clips to hold the rails together really strongly and some other bits I can't identify - probably because there are no instructions in the box.
Never mind, a quick track and pickup clean and a dose of 9V from a battery sees the model trundle along the straight lengths of track.
According to the web, this is a model of the Sydney monorail and it certainly looks like it. I missed riding on this by a couple of years, much to my annoyance but at least I can enjoy it in miniature.
Looking underneath, the wheels look just like normal HO ones, but with the flanges on the outside. The powered wheels both have traction tyres, pickup being from long metal strips rubbing on the rails.
My first impressions were that this is a bit of a toy, but it's pretty accurate, at least in looks. As the basis for a more detailed model, I can see it has loads of potential. Maybe I'll build that futuristic model railway I've often wondered about after all. Making my own track shouldn't be too hard, and watching the second-hand market might produce more sensibly priced trains.
And now the obligatory clip from the Simpsons: