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HO or H0 is a rail transport modelling scale using a 1:87 scale (3.5 mm to 1 foot). It is the most popular scale of model railway in the world. The rails are spaced 16.5 millimetres (0.650 in) apart for modelling 1,435 mm ( 4 ft 8+1⁄2 in) standard gauge tracks and trains in HO. The name HO comes from 1:87 scale being half that of O scale, which was originally the smallest of the series of older an... Wikipedia