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4 mm scale
4 mm scale model of a British Rail Class 25 shown with a 18mm coin for size.
Scale
4 mm to 1 ft (305 mm)
Scale ratio
1:76.2
4 mm scale is the most popular[1] model railway scale used in the United Kingdom. The term refers to the use of 4 millimeters on the model equating to a distance of 1 foot (305 mm) on the prototype (1:76.2). It is also used for military modelling.
For historical reasons, a number of different standards are employed.[2]
^"OO - World Of Railways". www.world-of-railways.co.uk. Retrieved 2022-03-31.
^"Model Railway Scales and gauges explained". World Of Railways. 2019-01-16. Retrieved 2022-03-31.
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