This section of the web site covers everything you might want to know about modeling in three-foot gauge in S.
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Three-foot narrow-gauge is defined as the distance of three feet (1 yard), 36 inches, or 914mm, between the rails. Railroads based on that gauge were, or can be, found all over the world.
Sn3 makes 3-foot narrow-gauge modeling much more practical than HOn3, in that the equipment runs better, and the scenery can be stunning. On3 offers the same advantages, but its space usage is usually more than what most people have available.