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It stands for "half-O". When it was first introduced the smallest scale was "O" or "Nought". All the scales, or "gauges" were known by numbers. Ther were gauges 1, 2 and 3. Larger sizes were referred to by the actual track gauge. Gauge 1 thrives today. Gauge 3 is having a revival here in Britain (1/24th). Gauge 2 is no longer used. Because there cannot be a number smaller than "nought" it was decided to call it "Half-Nought" or "Half-O", hence "HO". Just as a matter of interest. <br /> <br />MALC
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