OO9

OO9
For other uses of "009", see 009 (disambiguation).
OO9
009 Gryndene Halt.jpg
Gryndene Halt, a station on the fictitious Evaleight Light Railway, by the Sussex Downs 009 group
Scale per foot: 4 mm to 1-foot
Scale ratio: 1:76
Gauge: 9 mm (0.354 in)
Prototype Gauge: Approx 2 ft 3 in (686 mm)

OO9 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). It is a common choice in the United Kingdom for the modelling of narrow gauge railways whose prototype gauges lie approximately between 2 ft  (610 mm) and 2 ft 6 in (762 mm). The 9 mm (0.354 in) track gauge is used by N gauge model railways, a common commercial scale, which means that a selection of wheels and mechanisms is readily available.

2 ft  (610 mm) gauge railways were common in Britain, but 2 ft 6 in (762 mm) and particularly 2 ft 3 in (686 mm) were quite rare. This leads to difficulty in achieving correct scale when the gauge is widened, particularly with outside framed engines.

There is currently no commercially available ready to run support for OO9, although Peco do sell the necessary trackwork, and small manufacturers have made limited runs of models from time to time. The modeller is therefore generally dependent on kit manufacturers, of which there are many, adapting models made for OO, or scratch building. Many OO9 modellers also use HOe equipment

Standard HOe couplings are most often used. An alternative is the Greenwich coupling which is compatible with the standard couplings but can be magnetically operated. MicroTrains or Kadee couplings intended for N gauge can also been used.

Related Scales

Using N gauge 9mm track to model narrow gauge prototypes is also popular in HO scale model railways. In Europe, this is known as HOe while in the United States this is called HOn30 or HOn2½. As the latter indicates, 9 mm in HO scale is 783 mm (2 ft 6.83 in) in the prototype, closer to 2 ft 6 in (762 mm) gauge.

3 ft  (914 mm) gauge lines (common in Ireland and the Isle of Man) are generally modelled in 4 mm scale but with 12 mm (0.472 in) gauge track, which is known as OOn3.

Manufacturers

External links


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