HO Scale Model Trains
HO is the most popular size among model railroaders. HO refers to two different things: a scale (or modeling ratio), and a track gauge (the distance between the rails). In HO, scale 3.5 millimeters equal 1 foot. This works out to a size ratio, or proportion, of 1:87. That is, everything made to HO scale is 1/87th as big as the real thing, or prototype, that it represents. In HO a 6-foot man stands about 3/4" tall, and a big 87-foot boxcar is one foot long. HO also refers to the track gauge, the distance between the inside edges of the rails. HO gauge rails are spaced 16.5 millimeters apart, representing the standard gauge of 4' 8.5" used by most railroads across North America.
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