Let’s play Jeopardy. Answer: Measuring at a 1:87 scale ratio relative to the real thing, this is the most common and popular scale of model railroad in the world outside of the United Kingdom. The question, of course, is, what is HO scale. It’s not a reference to Christmas or anything like that. HO is an acronym for “Half O,” a reference to its approximate size relative to the train scale it overtook in popularity around 60 years ago.
HO scale model trains, scaled at 1:87 scale, are the most popular size and scale of model railroad in most of the world since the 1950s. It uses realistic 2-rail track and DC power.
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