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==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 [[H0e scale|H0e]] while in the [[United States]] this is called [[HOn30]] or HOn2{{frac|1|2}}. As the latter indicates, 9 mm in HO scale is {{convert|783|mm|abbr=on}} in the theoretical prototype, closer to {{Track gauge|2ft6in|lk=on}} gauge. {{Track gauge|3ft|lk=on}} gauge lines (common in Ireland and the Isle of Man) are generally modelled in 4 mm scale but with {{Track gauge|12mm}} gauge track, which is known as [[OOn3]].
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