Looking for more stories of the Colorado Railroads

As a few of you have seen, as well as possibly on some of the Groups.io pages, I posted a checklist for books that I should collect for gaining information and stories on the various railroads of Colorado. While reading through the DSP&P book by Mac Poor, I noticed that some of the stories in the book came from Railroad Magazine issues published in the 1930's. Are there any magazines or other types of literature I should add to my checklist when looking for stories, such as the Railroad Magazine? And as I have said, I don't mean just the narrow gauge lines. I'm talking about all of the routes. DSP&P, Gilpin Tramway, Manitou & Pike's Peak, Colorado Midland, you name it! Also, speaking of which, where are some good websites I can look for news articles on the subjects?