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EM gauge (named after the track gauge of a nominal E ighteen M illimetres [1]) is a variant of 4 mm to a foot (1:76) scale used in model railways. EM was developed because OO gauge, favoured by manufacturers of British prototype models, utilised track that was too narrow. OO was developed in the UK in the 1930s as a response to manufacturers ...
EM gauge: 1:76.2: 18.2 mm EM gauge was an earlier attempt in the 1950s to improve the inaccuracies of OO gauge, with wider, more accurate track at 18 mm (0.709 in) between the rails, but still narrower than the correct gauge. The gauge was later widened to 18.2 mm (0.717 in). The UK-based EM Gauge Society exists to supports modellers of these ...
The gauge of track built to these standards is 18.83 mm. Along with EM Gauge It is also a popular choice for finescale modellers working today. The main advantage of P4 over the other 4 mm standards is that the wheel flanges are approximately to scale and the flangeway gaps on P&C work are also close to scale.
18.83 mm (0.741 in) Prototype gauge. Standard gauge. Website. Scalefour Society. 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. For historical reasons almost all manufacturers of British ...
This 4 mm:1 ft modelling uses wheels 2 mm (0.079 in) or less wide running on track with a gauge of 18.83 mm (0.741 in). Check-rail and wing-rail clearances are similarly accurate. A compromise of P4 and OO is "EM" which uses a gauge of 18.2 mm (0.717 in) with more generous tolerances than P4 for check clearances. It gives a better appearance ...
Model railway scales and gauges are standardized in NEM 010, [1] which covers several gauges for each scale. Narrow gauges are indicated by an additional letter added after the base scale as follows: no letter = standard gauge (1,250–1,700 mm or 49.2–66.9 in) m = metre gauge (850–1,250 mm or 33.5–49.2 in) e = narrow gauge (650–850 mm ...