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Note that it does not confuse the scale ("échelle" in French)
which means the reduction ratio relative
the real hardware (which is expressed
as 1 / x) and the trade name "gauge" (also "échelle" in French)
which designates a material suitable to roll on a track of a given spacing (HO, 0, N ......)
For example the G and 1 use the same track but with totally different scales.
(1/22.5 for LGB and
1/32 to the actual 1)
There are two organizations that define the standards for rail model making:
MOROP (European Federation of National Model Railway Associations)is a European organization
that publishes NEM standards
The NMRA (National Model Railroad Association) widely used in North America.
To a certain extent, the NMRA and NEM standards are compatible.
Note that for scales H0 and 0, NEM uses the number zero or the letter "O", while NMRA uses the letter
"O" (HO instead of H0).
The term "narrow gauge" is used to designate a narrow track in its class
"m" denotes a metric track.
Note for the "O" and the "027" US :


CPJ38KV//
The following list is not exhaustive:
|
Naming |
Gauge |
Scale |
Remark |
| IV | 75 mm | Bing before 1914 | |
| III | 75 mm | Marklin before 1914 | |
| IIa | 67 mm | Schoenner, Carette, Bing before 1914 | |
| II | 54 mm | Bing, Marklin avant 1914 | |
| Standard | 54 mm (2-7/8 inches) | Unfixed size | Created by Lionel (USA) in 1906 and used until 1940 |
|
48 mm (between the axis of rails) |
Unfixed size |
Until about 1925 - Märklin, Jep, Bassett-Lowke and some German brands. Since 1925 Marklin, Aster ... |
|
|
45 mm
(between the inner faces of the rails) |
1/32 |
USA : Accucraft - MTH Marklin (D) - Aster Hobby (japan) |
|
| G | 45 mm (between the inner faces of the rails) | 1/22.5 1/22.3 | Called « Garden train » - LGB – Piko - Playmobil Used in USA (Bachmann ou Accucraft). |
|
35mm
(axes des rails) |
Unfixed size |
All brands until 1965 |
|
|
32 mm
(between the inner faces of the railss) |
1/43.5 |
France and Great Britain track 1,435 m. |
|
|
32 mm (between the inner faces of the rails) |
1/48 |
Germany – USA - Swiss |
|
| 33 mm | 33 mm | Old FV (Faivre, France) or JP (Jouet de Paris) | |
| 28 mm | 28 mm | Catalog JEP before 1939 | |
| S | 22.5 mm / 25 mm | 1/64 | Especially American brands (3/16") and JEP 25 mm (1953-1961) |
|
22,2 mm |
1/45 or 1/43,5 |
For tracks metric 0 | |
| 18 mm | 18 mm | Specific to JEP, "Mignon" series | |
|
16,5 ou
14,5 mm |
1/43,5 |
||
| On30 | 16,5 mm | 1/45 | Used in the USA (Bachmann among others) to roll on the HO, the twice as large equipment! |
|
16,5mm
(between the inner faces of the rails) |
1/72 (approximatly) |
1938 - 1950 Märklin, Hornby…. Very popular in England where the tracks were narrower (1,371 or 1,375 m.). | |
|
16,5mm
(between the inner faces of the rails) |
1/87 |
Since 1950, track 1,435 m. |
|
| HO Japanese | 16,5mm (face interne rails) | 1/80 | reproduces HO Japanese materials on track 1.067 m. |
|
13 mm |
Inaccurate size close to HO |
for Wesa materials (Swiss) |
|
|
12 mm |
1/87 |
for metric HO track | |
|
12mm
(between the inner faces of the rails) |
1/120 |
A partir
de 1950 - Triang, Berliner-Bahnen,
Roskof, Zerba |
|
|
9mm (between the inner faces of the rails) |
1/160 |
Since 1964 - |
|
| N japonnais | 9mm | 1/150 | Japanese tracks of 1.067 m for N |
| 009 | 9mm (between the inner faces of the rails) |
1/76,2 |
Mainly in England for tracks Décauville 0.700 m |
| Nm | 6,5 mm | 1/160 | Metric tracks for N |
|
6,5mm
(between the inner faces of the rails) |
1/220 |
Since 1972 |
|
| ZZ japonnais | 4,5 mm | 1/350 | Exclusiv Bandai |
| T japonnais | 3 mm | 1/440 | For Japanese suburban rail on tracks of 1,067 m. |