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1.
Railroading
In other words, the scale is exactly 3Vi
millimeters or approximately Vsth of an inch to the foot.
HO, about two-thirds the size of S Gauge and one-half the size of O Gauge, is preferred because it permits more railroad in any given amount of space than could be accommodated by a larger gauge.
http://www.fun-home-projects.com/hobbies/railroading.html