World's Smallest Working Model Train

Model train enthusiast David K. Smith has built a miniscule train layout which works - the train travels in an ellipse, including through a "mountain."
"Thus, what was intended to be a Z scale model of a 4- by 8-foot HO scale layout became a Z scale model of a 2- by 4-foot N scale layout! After I picked myself up off the floor, I made a few quick calculations... the modeling scale would be an eye-popping 1:35,200, and the finished layout would measure .125 by .200 inches..."

The video shows the basics of the layout and the clever solution re the motor.  Further details re the construction are here.

Neatorama has previously posted links to about 80 of the world's smallest things.

YouTube link.  Via Nothing to do with Arbroath.

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I have to agree with #2 and #3 -- it's not a model train, and it only looks like one from the right angle. This is like me calling a fleck of lint a 1/100,000 scale model of a cloud, even though it's not made of water.
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It's not a actual model train! There are no individual cars, an operating engine, or anything else that would make it qualify as one. It's a clever hack that sort of ~looks like~ a train. Sheesh!...
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