Since it appears that this forum has members who were not participants in the Mamod forum, I have judged it not inappropriate to post a brief description of my 0-gauge live steam locomotive, whose construction I serialized on the other forum.
Dr. James Senft presented Dickins (yes, spelled thus) in three 1976 issues of "Live Steam" magazine, basing it loosely on the 19th-century "dribbler" carpet locomotives still seen occasionally on sites like eBay and successfully copied by manufacturers like Maxwell Hemmens. Unlike those, locos, though, Dickins runs on 0-gauge or 027 track.
I built Dickins a couple of winters ago and have run it successfully on air. I hope finally to steam it this summer.