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HO = 1:87.1 OO = 1:76.2 O = 1:48 to 1:43.5

HO Converted to OO Size x 87.1 / . 76.2 , OO Converted to HO Size / 87.1 x . 76.2

O Converted to OO Size x 48 / . 76.2 ~ O Converted to OO Size x 43.5 / . 76.2 , two possible answers USA and UK Sizes

You Need to Find Out the Gange you are using to print it correctly, Not the Scale