You are so right. The small picture I posted here of a RPO is marked as Great Northern. I will have to check the source of the photo with the Pennsylvania passenger cars in the background. I believe you are right. Edited add on: You are correct the picture was taken at the Chicago Coach Yard. I did find a CB&Q Great Northern Sleeper in the Green and Orange livery. Possibly a repaint for museum purposes. Santa Fe did host foreign passenger cars as did others. There isn't a lot of Great Northern resources on line so tracking what they did is difficult. The guys and gals that filmed the Great Northern are limited and the film is poor. At least those films I've seen. Unless you know something I don't. More later.