There used to be a commercial size one which rolled along on a track near
Niton here on the Isle of Wight. Don't know if it is still here or not.

Mike

..................................................
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"Jeßus" wrote in message news
On Wed, 27 Aug 2014 06:52:05 +0100, Sacha
wrote:

http://www.farmshow.com/view_articles.php?a_id=1486

Not a bad idea. I considered doing the same thing on a much larger
scale, but the cost of making some tracks for it to slide on put me
off the idea.