Encyclopedia : O : OO : OO9 (2 articles)

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OO9
OO9 is a model railway scale/gauge combination of 4 mm scale and 9 mm gauge tracks, which would be accurately to scale for a prototype (real life) track gauge of 2 ft 3 in (686 mm). It is a common choice in the United Kingdom for the modelling of narrow gauge railways whose prototype gauges lie a..

 

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