World’s smallest model railway

This is a working Z scale model (1:220) of an N scale (1:160) train layout, which is – as its maker David Smith points out – “the equivalent of modeling at 1:35,200″ (that’s 35,200 times smaller than a real one). The whole thing measures 0.2 inches wide with a five-car passenger train running around the track and through a tunnel. It’s not actually a working train (nano technology isn’t commercialy available yet!) – instead the train is cut into the edge of a plastic tube connected to a geared motor.

Planet’s smallest model train set revealed to macro lenses, microscopes (video) (via Engadget)