The S-scale, known also as the S-gauge, for model trains is designed on the ratio of 1:64 [that is, 3/16 inches = 1 foot] and fits between the popular HO and O model train scales. It met the demands for a scale which was larger than HO [which was considered too small by many model railroaders] but smaller than the popular O scale thus allowing track layouts to be constructed in smalle... https://xn--o80bj2tekkuve.com/