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#1 Gauge, G-Gauge, and Scale (The Meaning of it All)

by Joseph Zajac

 

Are you confused by all the scales associated with #1 or G-gauge, or large scale model railroading? Maybe we can clear up some of the confusion.

 

GAUGE refers to the track gauge or the distance between the rails. #1 or G-gauge track is about 1 3/4 inches or 45 mm between the rails. SCALE refers to the size ratio of the equipment made to run on the track. For example, 1:24 scale means every inch on the model represents twenty-four inches of the real car or engine being modeled. There are a number of scales generally associated with #1 or G-gauge.

 

LGB was one of the first to use the 45 mm track width when they began modeling one- meter European rail systems. The size turned out to be 1:22.5 scale. When LGB introduced an American engine, they opted for a narrow-gauge type, or three feet between the rails because it most closely conformed to their European counterpart models in size. (Standard railroad gauge is four feet, eight and one-half inches between the rails, in case you didn’t know.) The scale of these narrow-gauge engines turned out to be 1:20.3. (Keep in mind that LGB never presumed to build true scale models.)

 

So now we have two scales running G-gauge track, 1:22.5 and 1:20.3. LGB also builds modern, standard gauge rolling stock that is probably closer to 1:24 scale. If they tried to maintain the 1:20.3 for standard-gauge equipment, they would be very large cars, indeed. Not only that, but they would have to run it on wider track to be in “scale” which certainly wouldn’t be very practical, now would it! It turns out, if you want to model standard-gauge using the 45 mm G-gauge track, the scale would be 1:32. Marklin and Aster are two manufacturers that use this scale. You will notice their engines and rolling stock are fairly diminuative for the very-large sizes of equipment they model. On the other side of this coin, it is surprising just how small narrow gauge equipment, such as that on the Cumbres & Toltec Railroad, really is!

 

Some one-off car manufacturers build their narrow-gauge rolling stock in 1:24 scale. Aristo-Craft and USA Trains opted to compromise between narrow and standard gauge scales, and build their models to 1:29 scale. Most of their equipment is standard gauge and at 1:29 scale, it is not much different in size than the LGB narrow-gauge equipment.

 

If you wish to accurately model your layout, you may have to stay with one manufacturer and scale to maintain some semblance of consistency. However, many garden railroaders are not very particular about maintaining the scale of their layout. You frequently see all sizes from all the manufacturers in a single train. In some circles, this is known as unashamedly following the “ten-foot rule” wherein your eyes are about ten feet from the ground a few feet in front of you—and it all looks good—and without the least concern about being in the proper scale!

 
 
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