Trackmobile in Germany
I wonder if any of these have been sold in Europe? http://www.factorydirecttrains.com/trackmobile.aspx It doesn't run on its road wheels - it is heavy weighing in at 1/4 Lb (= 4 oz), being Die-cast, and only has a coupler one end (not a problem on an tiny layout with single direction industrial area sidings).

That is excellent, although I hope the slow running is better than that shown in the video clip! Perhaps a bit of modeler's license would allow one on Grafenwalde for a bit of light relief at shows.