Scale
Although vintage 1 gauge trains use the same track standard as modern G scale, scale modeling was not a primary design consideration in 1 gauge's heyday, so the actual size and scale of the locomotives and cars varied. Generally, 1 gauge equipment worked out to approximately 1:32 scale (roughly 10mm = 1 foot). G scale at 1:22.5 means the 1 gauge track represents 1,000 mm (3 ft 3 3⁄8 in) (metre gauge) track. Such railways are to be found in, among other places, Switzerland, the inspiration source for many commercial G gauge models.
By comparison, 1 gauge's 1:32 scale makes it nearly three times the dimensions of modern HO scale, the most popular size today.
Read more about this topic: 1 Gauge
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—Henry David Thoreau (1817–1862)