Ralph
How do you find out all of this information?
Lots of practice!
Lionel's web site has a user friendly search feature and good product data since about 2000. The MTH web site has comprehensive data and the search feature is good, very good if you know its quirks. Weaver is good at listing products that are in stock and they have a list of past products by road name.
The Atlas web site is absolutely - freaking - horrible for finding anything! There is no search by road name feature and no comprehensive product list. My frustration with the Atlas web site lead what has become by freight car research project. If I could have just found the cars I wanted on the Atlas wen site I would never have had to find all the things I don't want. LOL
Pete
That is a good breakdown of the evolution of the Pacemaker paint scheme. The car cement roofs may have gone back earlier. Take a look at the description in this 1946 article.