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, represents 1 real foot (304.8 mm); this ratio works out to 1:87.0, usually rounded to 1:87.1. According to the MOROP standard NEM 010 predominantly used in Europe, the scale is exactly 1:87. In HO, rails are spaced apart which models the standard railroad gauge of .

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