Tom,

Hundman's Railroads Illustrated or whatever it was called back then in their multi-part MILW issue
had a lot of what you're talking about

Make sure you get a copy of SPV's (Steam Powered Video) Mountain Plains Map Book, it's excellent
for abandoned lines.

You're probably doing this at the right time, there's talk that the Loweth substation is going to
be torn down and Ringling station looks like it could do it on it's own.