3 relations: O scale, O14, On30 gauge.
O scale
O scale (or O gauge) is a scale commonly used for toy trains and rail transport modelling.
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O14
O14 is a set of model railway standards for accurately modelling narrow-gauge railways in 1:43.5 (7 mm scale) using gauge track.
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On30 gauge
On30 (also called On2, O16.5 and Oe) '''gauge''' is the modelling of narrow gauge railways in O scale on HO gauge track in 1:48 scale ratio by American model railroaders, in 1:43.5 scale ratio by British and French model railroaders and 1:45 by Continental European model railroaders (excluding France).
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References
[1] https://en.wikipedia.org/wiki/7mm_Narrow_Gauge_Association