This is a car Jack (Division Point) didn’t do on the HO Flyer likely due to the not as common nature to the consist like the WP and CB&Q Head end cars. West of Lincoln no mail contract so it’s simply storage and excess so these critters were added in high demand runs I suspect meaning they ran Chicago - San Francisco. Dr Allen doesn’t have anything in the Expo Flyer data file that I can find except what you see in the Expo book the Q Society did.
Between Jefferson and myself maybe a visit to the library at the CRRM I might be able to find some further shots of the cars. I also decided to build one too picked up another Protocraft box and PSC Allied trucks I had from Back stock.
However worth noting is the following image with one acting as possibly overflow of storage ahead of the usual suspects; one of my favorites the 1550 class baggage cars
Some nice Phase II E5’s in full skirts brings the eastbound Expo over the Mississippi at Quincy, Illinois detoured due to flooding on the Iowa line. Image copyright: 1947 Kalmbach Publishing.
As you’ve already figured out this train was anything but a standard consist.
