Yeah. Thanks, Ed. Great resource.
Looking at historical local lines (Centralia, IL), I have a minor quibble. What they have labeled as "MP" was known here as the "Missouri-Illinois", colloquially as the "Mike and Ike." I don't know whether to "correct" it or not, as it always was a wholly-owned subsidiary of the MP. They did have "MI" reporting marks on rolling stock, and there was at least an RS-3 lettered for the line.