00n3 is the description given to modelling 3 ft (914 mm) narrow gauge railways in 4 mm scale with 12 mm (0.472 in) gauge track. 3 ft (914 mm) prototypes were common in Ireland and the Isle of Man, but the scale is not generally used outside the British Isles.
00n3 is the description given to modelling 3 ft (914 mm) narrow gauge railways in 4 mm scale with 12 mm (0.472 in) gauge track. 3 ft (914 mm) prototypes were common in Ireland and the Isle of Man, but the scale is not generally used outside the British Isles.
Source: Wikipedia "00n3" · CC BY-SA 4.0
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