HO Scale
HO or H0 is the most popular scale of model railway in the world.
According to the NMRA standard S-1.2 predominantly used in North America, in HO scale, 3.5 mm (0.1378 in) represents 1 real foot (304.8 mm); this ratio works out to about 1:87.1. According to the MOROP standard NEM 010 predominantly used in Europe, the scale is exactly 1:87. In HO, rails are usually spaced 16.5 mm (0.64961 in) apart which models the standard railroad gauge of 1,435 mm (4 ft 8 1⁄2 in).
Read more about HO Scale: Derivation, History, Controls, Gauge, Trackage, Availability, Advantages Compared To Other Scales, HO in Other Hobbies and In Marketing Usage, Manufacturers
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—Aldous Huxley (1894–1963)