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John , O is like garden you have o-scale which is 1/4 scale on 5' track, proto-48 which is 1/4 scale on 4'8.5 (2 rail) and you have O/o27 which is anywere between 3/16 (s-scale) and 1/4 scale on 5' track ( 3 rail). O and proto use radius for curves ( like G ) were as O/O27 ( 3 rail) uses diameter. So O 3rail because of the couplers mounted by talgos on the trucks can actually turn tighter than the O 2 rail. The flanges on the wheels are also different. Neville Rossiter is a O-Scaler from your country that lives in PERTH maybe you can get in touch his layout looks fantastic
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