Posted online are various layouts and track plans of various sizes for O, O27, HO, N, S, G, TT and Standard Gauges. There are a total of over 400 track plans, all online, at no charge. Site also has beginner's info, "getting started" articles, basic manuals, free downloads and other resources for all scales and gauges.
(And to my old pals out there, I've been laying low ...just had a medical procedure on Jan. 21, and now all is well. Happy Railroading! Thor)