OF ALL INDOOR SCALE subjects, the one that stands out compared with, say, aircraft, cars or ships, has been model trains. This is primarily because model railroads are not static models – instead, they are intended to be working miniature replicas.
At barely 6.35 x 3.18 mm (0.25 x 0.125 in) in size, New Jersey model train builder David Smith’s tiny train must be in the record books for the smallest ever - it works out to 1:35,200 scale. It’s not a feature in its own right however, for it represents a model train running inside an already small Z-gauge 1:220 scale display.