The world’s smallest working model is a working Z scale model of an N class train layout. It is basically a model of a model!

It is a Z scale (1:220) model of an N scale (1:160) train layout. That is the equivalent of modelling at 1:35,200.

It measures 0.2” wide. If scaled up to full size it would be 44” wide.

Made by model train enthusiast David Smith, the 1/35200 model  features a five train carriage that travels on a track through a tunnel powered by a two-inch motor fitted behind the scenery

This incredible work of art, can be viewed by clicking here http://internetsiao.com/worlds-smallest-working-model-train-set/