Railroad Archives Online
- CollectionD0063 - Walter W. Ainsworth Collection
- Series007 - Spokane, Portland, and Seattle Railway
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3004 - Railroad Passenger Cars
- ItemWWASPSL1-028 - Spokane, Portland, and Seattle (SP&S) Observation Car, Portland, Oregon, undated
- ItemWWASPSL1-029 - Spokane, Portland, and Seattle (SP&S) Observation Car, Portland, Oregon, 1929
- ItemWWASPSL1-030 - Spokane, Portland, and Seattle (SP&S) Observation Car, Portland, Oregon, undated
- ItemWWASPSL1-073 - Spokane, Portland, and Seattle (SP&S) View of Train in Lake Yard, Portland, Oregon, undated
- ItemWWASPSL2-012 - Spokane, Portland, and Seattle (SP&S) Train Number 3 at the Depot, Washougal, Washington, undated
- 82 more...