Lesson plan
OO9
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 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, track, and mechanisms is readily available. gauge railways were common in Britain, but the gauge implied by 9 mm at 4 mm scale - - was quite rare - today only the Talyllyn and Corris railways in the UK use this gauge. However at 4 mm/foot scale, the differences to gauge required to correct this are barely perceptible by eye, and the wide use of 9 mm gauge in the modelling community is generally accepted to be an appropriate compromise. For example, the correct gauge for a 2-foot prototype would be 8 mm, but the resulting 1 mm difference from the OO9 standard is treated as insignificant by most modellers. The 009 Society exists to connect modellers; it issues a monthly newsletter 009 News, commissions its own range of kits and provides a popular second hand resale service.…
Article summary
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 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, track, and mechanisms is readily available. gauge railways were common in Britain, but the gauge implied by 9 mm at 4 mm scale - - was quite rare - today only the Talyllyn and Corris railways in the UK use this gauge. However at 4 mm/foot scale, the differences to gauge required to correct this are barely perceptible by eye, and the wide use of 9 mm gauge in the modelling community is generally accepted to be an appropriate compromise. For example, the correct gauge for a 2-foot prototype would be 8 mm, but the resulting 1 mm difference from the OO9 standard is treated as insignificant by most modellers. The 009 Society exists to connect modellers; it issues a monthly newsletter 009 News, commissions its own range of kits and provides a popular second hand resale service.…
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
Bibliography
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Key claims and bibliography are generated from the same tracked claims and sources as the article page.