As mentioned above, go to the Atlas O website. Click on "New Products." There is a chronological listing of all the products. It takes a little work but you build the list in reverse chronological order. I did it a while back and printed them. But, only for the Rio Grande cars. Remember that Atlas O sort of dribbled them out over the years and then turned around and released full sets recently.
As for the "real" cars, each road had a different quantity based on their percent of total mileage - I think. See the following for details.
http://calzephyr.railfan.net/cars/cars.html
