Douglas, your list is a newer version of the one I got a hold of, because a lot of the comments are the same between the two.
Anyway, I've been adding and correcting stuff today. I had forgotten that I had a copy of Robert Sloan's "A Century + Ten of D&RGW Narrow Gauge Freight Cars." I've been looking that over, and it has been quite helpful in trying to figure out how to classify the cars. I have created a second database of car classes, like 30-foot boxcars, and I'm in the process of classifying everything that can reasonably be classified. This will also let us bring up a page about a particular class, where we can describe the class itself, as opposed to individual examples of that class.
I'm also thinking of adding car numbers that were once C&TS property, but no longer exist because they were converted or sold. This would include the steel flat cars that the C&TS acquired from the D&RGW, but have since been converted to steel coaches. This would help relate the roster as of 1970 to what is there today.