My favorite is "The Rainbow Route", I also have Ferrell's "South Park", which Gunnison stone water tanks included in there I have modeled, M.C. Poor's "D,SP&P", and "Narrow Gauge in the Rockies". In a discussion with a Colorado Springs HO kit builder
at a Narrow Gauge Convention, I learned, from laptop files he showed me, that "The Rainbow Route" needs to be rewritten, with much more information and photos that have come to light. I'd sure like to see that...