4 mm scale

4 mm scale
4 mm scale model of a British Rail Class 25 shown with a 18mm coin for size.
Scale4 mm to 1 ft (305 mm)
Scale ratio1:76.2

4 mm scale is the most popular 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.

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