This section of the web site covers everything you might want to know about modeling in two-foot gauge in S.
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Two-foot narrow-gauge is defined as the distance of two feet, 24 inches, or 610mm, between the rails. Railroads based on that gauge can be found all over the world; in the U.S., Canada, Australia, South Africa, Wales, etc. Nearly every state in the U.S. has or had two-foot gauge railroads, mostly in tourist or park locations.
Sn2 is ideally suited for those modelers with not enough space. In the real world, two-foot gauge was used because space was at a premium, there were narrow clearances along the right-of-way, the railroad wanted to keep their costs as low as possible, or a combination of these factors.