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<p>OO scale is 1/76 scale, whereas HO is 1/87 scale. This may not seem much, but it actually is quite a lot. Most British railway modellers use 16.5mm track, which is not the correct gauge for 1/76 scale. There is a small number of folks modelling in EM gauge, which is 18.2mm - the correct gauge for standard gauge models in OO scale. Proto4 is the fine scale edition of EM gauge, which prototype rails and wheel flanges.</p> <p>I´d suggest to go with "regular" OO scale and 16.5mm track in order to keep things manageable.</p>
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