This page covers various ways to scale things to the correct proportions for S-scale modeling.
To size a drawing (for example, from a magazine) from a particular scale to S-scale, use these enlargement or reduction settings on a copying machine:
To convert from any other scale to S-scale, divide that scale's proportion by 64 and multiply by 100.
For example, let's say you want to convert from 1:29 (G gauge) to S. Use the following:
29 / 64 x 100 = 45.3125%
Lionel posted a blog on how to measure and determine scale speed for S-and O-scales.
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