I'd buy one if published.
While pondering the thought of a new book on Sumpter, I thought about what I would enjoy reading about...
- historic photos (but of course)
- more information regarding general operation; passengers, freight, MOW, track, etc.
- equipment rosters
Just to throw this out, I am currently going through the SVRy archive materials at Eastern Oregon University. While there are now photos in the archive, there are many blue print maps and other papers that may be of interest for the book. I have quite a bit scanned already and plan to keep working on them as time allows me. PM me off line if you end up going through with your plans and are interested in any of the materials. I can help with the EOU contact if necessary.