Leo-
I recall some reference to “The Pride of the Burlington” moniker being applied to the Zephyr Diner carbody in Sandwich, IL when I stopped there in the late 60’s. It seems to me that they had a picture of the car on display and it was a coach.
I do not believe the car has anything to do with the “Isabella”; more likely the car was a coach from the Burlington Limited c. 1897. Durbin’s article in More Classic Trains The Finest Trains on Earth first appeared in Trains Magazine does not have a complete list of cars for the two consists but lists the following cars that could be candidates for the diner:
Buffet-Library-Smoking-Baggage Cars Minneapolis and St. Paul
Day Coaches Winona and Savanna
Chair Cars Alma and Maiden Rock CB&Q #369
16 Section Sleepers Parthenon and Pantheon
Compartment Cars Angelo and Apollo
Observation cars were Wisconsin CB&Q 304 and likely Minnesota CB&Q 302
Bill Glick’s Passenger Car Roster may have more info; right at the moment I can’t lay hands on my copy.
Charlie Vlk