Brian: I assume you have a copy of the Morning Sun Books "CB&Q Color Guide to Freight and Passenger Equipment"? Look at the bottom picture on page 93. I wonder if anyone will ever do that car?
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For non-CB&Q modelers, it's a CB&Q rack, which almost has to have been painted before 3-70, on a yellow KTTX flat, which had to have been painted in or after 1970. If the rack had been painted in or after 3-70 it would probably have been BN green, and almost certainly had a BN herald. TTX didn't start using the yellow paint until sometime in 1970.
Did TTX repaint the flats without removing the racks?