I also contacted the same person in my search for the Rio Grande version. For those who want more information on these USA Trains flat beds with autos on them, I left alot of information in my USA Info Registry here > www.trainboard.com/grapevine/showthread.php?p=592417&posted=1#post592417 You will be surprised as to what was made, it is good reading for those interested in USA Trains history of what was produced.
Route 66 why did you edit your thread, I'm glad you brought those USA Trains Auto flat cars to our attention