I was looking at O scale trains mag online and found an article about on30. http://www.oscalemag.com/docs/dwnld.html There are probably more articles about this scale in the other issues, so you maywant to look at all the free issues. I looked through most of them over the years and there are some nice trackplans to be found here.
Hey Geeky, They do throw us a bone now and again in O scale mag!! There is also a great series running in MR on an On30 railroad "you can build." John