The Proto current is a model railroad current founded in 1966 aimed at exact compliance with the scale chosen for tracks , switches and rolling stock (wheels, hitches …). This philosophy is close to the finescale practiced in England and the United States .
The Proto tracks and rolling stock, because of the fineness of the standards and the reproduction of real couplers , are incompatible with the industrial standards published by the MOROP and the NMRA 1 .
In The Model Railway Study Group (MRGS), an English group of railway model makers, defines Protofour (or P4 , scale 4 2 , or 1:76) as fine- tuned , with a reduced and therefore more rigorous manufacturing tolerance. Indeed, the scale 00 used in England rolls on rails at a false spacing compared to the reduction 1:76: to reproduce a standard spacing track , it would be necessary a track of 18,83 mm of spacing. Manufacturers 3 use the 16.5 mm track, used by practitioners on the HO scale (1:87). To enjoy these fine standards to other railway modellers, the MRGS published in 1978 standards for the 1:87 scale, used in continental Europe and North America 1 .
Practitioners of these norms are grouped under the term Proto , prototypical English , designating the prototype model reproduced, followed by the numerical value of the scale chosen: for the scale HO (1:87), one speaks therefore of Proto87. We also find the shortened designation, or Proto is reduced to its initial: P87
Ango-Saxon standardization places a double point between the term Proto and the following figure: Proto: 87 .
All the usual rail model scales are theoretically usable to Proto standards , but the most common are:
- The ProtoFour or P4 , historical scale of movement, taking scale scale 4 2 (1:76) strictly.
- The Proto87 , the most widespread scale, which takes the elements of the HO scale (1:87),
- The Proto45 4 , Zero scale in Germany (1:45),
- The Proto43,5 , scale Zero in France (1: 43,5 – gauge of rails of 33mm),
- The Proto35 5 , scale 1:35, resuming the basics of military model making .
The NMRA has normalized some of these scales from 1: 20.32 to 1 / 87.1 6 .
The FREMO standards: 87 7 are German standards for the realization of modular networks with fine standards (Proto and HOpur).
Notes and references
- ↑ a and b Presentation of Proto87 on the French Proto Club website [ archive ] .
- ↑ a and b English scale reproducing 4 mm in miniature for 1 real foot
- ↑ Notably Hornby .
- ↑ ( en ) Presentation of Proto45 [ archive ]
- ↑ Proto35 discovery page [ archive ]
- ↑ ( in ) S-1.1 Standards for Proto Models [ archive ] [PDF]
- ↑ ( in ) www.fremo-87.de [ archive ]