Railroad Archives Online
- CollectionD0063 - Walter W. Ainsworth Collection
- Series001 - Burlington Northern Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3004 - Railroad Passenger Cars
- ItemWWASPS-PC1-006 - Spokane, Portland and Seattle (SP&S) Mail and Baggage Car Number 28, Bend, Oregon, undated
- ItemWWASPS-PC1-007 - Spokane, Portland and Seattle (SP&S) Mail and Baggage Car Number 31, Pasco, Washington, June 1968
- ItemWWASPS-PC1-008 - Spokane, Portland and Seattle (SP&S) Mail and Baggage Car Number 37, Portland, Oregon, August 10, 1949
- ItemWWASPS-PC1-009 - Spokane, Portland and Seattle (SP&S) Mail and Baggage Car Number 41 (2nd), Portland, Oregon, undated
- ItemWWASPS-PC1-010 - Spokane, Portland and Seattle (SP&S) Mail and Baggage Car Number 41 (2nd), Portland, Oregon, undated
- 24 more...