Protofour or P4 is a set of standards for model railways allowing construction of models to a scale of 4 mm to 300 mm (1 ft) (1:76.2), the predominant scale of model railways of the British prototype. For historical reasons almost all manufacturers of British prototype models use 00 gauge (1:76.2 models running on 16.5 mm (0.65 in) gauge track). There are several finescale standards which have been developed to enable more accurate models than 00, and P4 is the most accurate in common use. The P4 standards specify a scale model track gauge of 18.83 mm (0.741 in) for standard gauge railways. Joe Brook Smith was the first to propose use of an exact scale track gauge in July 1964, when also the term “Protofour” was invented by Malcolm Cross. The standards were later published in Model Railway News by the Model Railway Study Group in August 1966. More information...
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