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4mm scale
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4mm scale

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 on the prototype (1:76.2). It is also used for military modelling

For historical reasons, a number of different standards are employed:

OO gauge trains can be converted to work on EM or P4 by replacing or reprofiling wheels, fitting the correct width axles and moving the locomotive or carriage frames outward to suit. Products intended for the more dedicated modeller are generally designed to be buildable to fit any of the three standards.