OO9, often also denoted as 009 or 00-9 and commonly pronounced as Double-Oh Nine, is a model railway scale and gauge combination of 4 mm scale and 9 mm (0.354 in) gauge tracks, which models a prototype track gauge of 2 ft 3 in (686 mm).

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OO9 is the ultimate space-saver amongst the mainstream ready to-run scales. It is rendered at the 176 scale of standard OO (4mm/ foot), but runs on 9mm gauge track, reflecting a ‘real life’ gauge of approximately 2 feet 3 inches.

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Through using 9mm gauge track with 4mm (OO scale) models means you can pack a lot of track into a small space that wouldn’t otherwise be possible yet the models are larger than N gauge. It’s also a nice way of exploring more intricate aspects of model making.

OO9 is 4mm to the foot scale (that is OO or 1/76) but using 9mm track gauge (the same size as N gauge). This is narrow gauge modelling and is meant to represent 2ft gauge in real life. The name comes from OO scale and 9mm track.

2025年2月28日 · Corrish in 'OO9' scale. 28th February 2025. Corrish is a 'OO9' gauge layout built as a ‘greatest hits’ of the old Corris Railway, a 2ft 3in narrow gauge slate railway in Mid-Wales modelled in 'OO9' scale. See it at Model World LIVE 2025.

2025年2月2日 · Bachmann’s long-awaited ‘OO9’ gauge Baguley-Drewry diesel locomotives are here five years after they were first announced, but have they been worth the wait? BEN CHURCH takes a closer look.