I know that both the Smithsonian and California State Railroad Museum have collections of Pullman Builders Photographs (negatives). Smithsonian also has a limited number of prints not otherwise in its negative collection.

Are there any other collections of either negatives or prints? I am especially looking for some both Pullman sleeping cars and other passenger cars from the 'teens and 'twenties.

The Pullman Library.... http://www.irm.org/history/pullmanlibrary.html

Thank you for the suggestion. Primarily IRM has drawings and supporting records.

Does anyone have any other locations?