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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Unlike EM gauge which I’ve mentioned before, 009 isn’t a more accurate representation of Standard gauge but a scaled down version of narrow gauge railways. The track is actually N gauge is width — 9mm between the rails — while the …

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If you're looking for a fascinating and rewarding hobby, then look no further than OO9 model railways. These are miniature train sets that run on narrow gauge tracks, typically in a scale of 4mm to 1 foot, and they offer a wide range of benefits to those who enjoy creating intricate layouts and watching their trains op

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. It is a very similar scale to …

Minitrains are a manufacturer of Narrow Gauge locomotives and rolling stock in HOe/OO9 scale. They look to capture the atmosphere of a variety of industrial and narrow gauge prototypes and are known for their good looks and smooth running capabilities.