Background
When N gauge was developed it proved impossible to fit the then available motors into scale models of British prototype locomotives. British railways use a smaller loading gauge than those in Europe and America, resulting in smaller locomotives. A greater body size was required on the models to accommodate the motors, so instead of adopting the correct 1:160 scale, 1:148 was used. This allows larger models, but means that the gauge is not an accurate representation of standard gauge. A similar problem and solution was adopted with OO gauge and British TT gauge in Britain. However, N since it scales to approximately 4'4½" gauge it is less out of scale than OO (4'1½") or TT3 (4'0") in representing the 4'8½" standard gauge.
Read more about this topic: British N Gauge
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