I was into them a few years ago. I don't have any photos, but it was an AFX system (smaller scale than Scalextric) I had a 4 lane track permanently laid on mdf over two table tennis tables.
The plan was to put in hills and scenery but all I ended up doing was racing and drinking with mates.

I've taken both my kids to a local track called Thunderbirds slot cars http://www.tbirdslotracing.com.au/birthday.php

They have 4 layouts and computer controlled lap counters etc. Love these things, I can see I will get into trains when I get older. :errf: