to the size of the model relative to the actual full-sized object being represented, while gauge is the width of the model track. Most commercially produced model track is a compromise between appearance and a trouble-free running surface.

Scale

Scale is the ratio of a model dimension to the real life dimension. O Scale in the UK is commonly 1:43.5 or 7 mm to the foot. In continental Europe it is commonly 1:45. 1:43.5 is also used, particularly in France. In the USA, 1:48 is common. The

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