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OO9 is a model railway scale and gauge combination of 4 mm scale and gauge tracks, which models a prototype track gauge of . It is a common choice in the United Kingdom for the modelling of narrow gauge railways whose prototype gauges lie approximately between and . The 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. gauge railways were common in Britain, but and particularly were quite rare. This leads to difficulty in achieving correct scale when the gauge is widened, particularly with outside framed engines. There is currently minimal commercially available ready to run support for OO9, although a number of manufacturers have started to announce ranges of products, 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. In November 2012, Peco announced the launch, during 2013, of a range of ready to run 009 coaches and wagons, based on prototypes of the Lynton and Barnstaple Railway.〔(Peco new product announcement ''(retrieved 29 November 2012)'' )〕 Although no locomotive models were announced, in the March 2013 edition of Railway Modeller Magazine, Danish manufacturer Heljan announced an 009 locomotive based on the Lynton and Barnstaple Railway Manning Wardle 2-6-2Ts. In July 2014, Bachmann announced a range of ready to run 009 products, starting with a Baldwin Class 10-12-D locomotive and a number of wagons, primarily used by the British War Department during World War I.〔(Introducing Bachmann's Narrow Gauge range ''(retrieved 23 December 2014)'' )〕 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 9 mm 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 HOn2. As the latter indicates, 9 mm in HO scale is in the theoretical prototype, closer to gauge. gauge lines (common in Ireland and the Isle of Man) are generally modelled in 4 mm scale but with gauge track, which is known as OOn3. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「OO9」の詳細全文を読む スポンサード リンク
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