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.

This guy has skills. I once tried a RC helicopter once and the results were disastrous. To be able to manipulate all theses servos takes great skills and this dude demonstrates it with the neat clip.
Those moves defy Newton’s Laws of Motion…even at that scale.
Enjoy!

Link: YouTube