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What is N-Scale?Although it may be mistakenly called N-Gauge, derived from some of the earliest mass produced 1:152 "OOO" or "Treble-O" scale models manufactured by the British firm, Lone Star, in 1961, 9 mm wide (i.e., a track gauge of 0.354 inches, as measured between the inner sides of the rail) contemporary N-Scale model production was initiated by the German firm, Arnold Rapido, in 1962.
While a rail gauge of 9 mm remains constant for standard gauge (as opposed to narrow gauge) N-Scale locomotives and rolling-stock, depending upon the place of manufacture and/or the specific market that a model is targeted to be sold in, its size in proportion to its prototype (i.e., "scale") may be 1:148 (British Outline), 1:150 (for Japanese 3 foot 6 inch /1,067 mm or 4 foot 6 inch / 1,372 mm gauge trains), or 1:160 (for North American, Japanese 1,435 mm high-speed trains, and Continental European) scale. Read more here.