Scale of G

Discussion in 'G / O / S Scale Model Trains' started by hk tam, Jan 11, 2006.

  1. hk tam

    hk tam New Member

    Dear All,

    I would like to ask what is the scale of "G" gauge? Is it same as "O" ?

    many thanks

    HK Tam
  2. cidchase

    cidchase Active Member

  3. jetrock

    jetrock Member

    It is nowhere near the scale of O. The problem is that more than one scale uses G "gauge" track. If you are modeling standard-gauge equipment, its scale is 1:29, if you are modeling meter gauge it is, I think, 1:24 and if you are modeling 3' gauge it is 1:20.3...roughly. Some manufacturers don't follow those figures exactly. So it depends on what kind of equipment you want to run.
  4. spankybird

    spankybird OTTS Founder

    And then to add to the mix, you have Gauge1 which also uses 'G' gauge track. And it is 1:32 sign1 :curse:
  5. Steamtom1

    Steamtom1 Member

    To determine the scale first you need to know what real life gauge you are modeling. Then you have to convert the gauge to millimeters, and divide by 45 mm. If you do the math, (remember this from Junior High?), you get the following:

    Standard Gauge: (4 foot 8 ½ in.) converts to 1:31.9, or 1:32 rounded.

    European Meter Gauge: (1000 mm) converts to 1:22.2

    U.S. Narrow Gauge: (3 foot) converts to 1:20.3

    Maine Narrow Gauge (2 foot) converts to 1:13.5

    1:29 doesn’t correspond to anything in real life. It think it is meant to be an approximation of Standard Gauge.

    Any more questions?
  6. pgandw

    pgandw Active Member

    The 1:29 scale was used by Aristo and some other folks instead of 1:32 for models of standard gauge so they wouldn't look so puny in comparison to the 1:20.3 models of narrow gauge.
  7. Steamtom1

    Steamtom1 Member

    Sounds like a reasonable explanation. Here is a narrow gauge steam tram pulling a string of 1:32 coaches.

  8. TinGoat

    TinGoat Ignorant know it all

    This is a good start.

    "G" scale and/or "G" gauge are misnomers.

    I model Hn42. That is H scale on Gauge 1 track. 1/2" = 1'. By ratio, it is 1:24. On Gauge 1 track, which is 45mm gauge that is close enough to 1 3/4" to scale out as 42" or 3' 6". So "H" is for half inch scale, "n" is for narrow gauge and 42 is the scale equivilent of Gauge 1 track.

    "G" is for Garden, or Generic, or General...

    Whatever you do, don't confuse Gauge with Scale.

    Scale refers to the proportional relationship between the real thing (Prototype) and the model. Most accurately described with ratio. HO scale is 1:87. S sscale is 1:64, O scale is 1:48 and G scale is one of the many scales that run on gauge 1 track...

    There is Zero Gauge, which is number 0. This gets translated into "O" scale, but it firstly applies to the track gauge of 32mm between the rails. For this, you have "O" scale (1:48) standard gauge. Which is actually a little wide. You could run H scale on 0 gauge track and it would be Hn30.

    You can run H scale on HO gauge track (16.5mm) to represent 15" gauge. Hn15. Commonly known as Gn15...

    Number One Gauge, which is gauge 1. This gets translated into almost all of the "G" scales. It is 45mm gauge which is very close to 1 3/4"

  9. N Gauger

    N Gauger 1:20.3 Train Addict

    And after all these numbers the NMRA created "F" scale which is now 1:20.3 Because of the interest in Narrow gauge Model Railroading in the US.

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