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), [1] the predominant scale of model railways of the British prototype.

Mar 19, 2020 · P4 or Protofour is a set of track standards using 4mm:1ft scale - the same as OO gauge - but with a slightly wider and more accurate track gauge. P4 modelling standards are supported by the Scalefour Society and the EM Gauge Society. The most popular scale for railway modelling in the UK is 4mm:1ft.

P4 (also known as Protofour) is as true to the scale of 4mm to 1ft (1/76 scale) as you can get, giving a true representation of a properly scaled OO gauge railway. This is what OO gauge should have been in the first place rather than manufactures compromising and utilising existing 16.5mm HO …

The most important single factor in ensuring reliable P4 operation is the maintenance of the correct tyre and railhead contours, and the successful use of the P4 track and wheel standards is conditional on the use of the scaled-down equivalents of these contours, as given in figure 1. From these contours is derived the effective flange ...

C & L Finescale are the suppliers of a well proven range of track parts for over 30 years using code 75 and code 131 Bullhead Rail for 4 and 7mm scales.

The Scalefour Society is a British organisation dedicated to the promotion and modelling of railways using the 4mm to 1-foot scale (1:76.2) with a track gauge of 18.83mm, commonly known as P4 (Protofour).

This video shows a P4 scale layout by the Manchester Model Railway Society called "Slattocks Junction", this was its first exhibition outing at the Mancheste...

Present Protofour track and wheel standards (dimensions and tolerances) calculated and drawn by JBS. First publication of the concept and principles of EEM/P4. Article in August and September issues of the Model Railway News under the …

Feb 15, 2010 · A P4 layout of Irish railways has a gauge of 21mm and one of GWR broard gauge 28.083mm. They are all P4. P4 is modelling to a scale of 1:76.2 but using defined wheel/track standards developed by the MRSG.

May 6, 2024 · Welcome to this website showcasing our model railway layouts built to P4 standards. We are a group of friends based in the south east of the UK who have constructed several layouts to these standards, both for home use and to exhibit at model railway exhibitions.