Railroad Archives Online
- CollectionD0063 - Walter W. Ainsworth Collection
- Series007 - Spokane, Portland, and Seattle Railway
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3002 - Depots and Freighthouses
- ItemWWASPSL1-010 - Spokane, Portland, and Seattle (SP&S) Freighthouse, Portland, Oregon, undated
- ItemWWASPSL1-011 - Spokane, Portland, and Seattle (SP&S) Freighthouse, Portland, Oregon, 1928
- ItemWWASPSL1-024 - Spokane, Portland, and Seattle (SP&S) Drawing of the Proposed Union Depot, Portland, Oregon, April 1882
- ItemWWASPSL1-027 - Union Station, Portland, Oregon, circa 1900
- ItemWWASPSL1-066 - Spokane, Portland, and Seattle (SP&S) North Bank Freighthouse, Portland, Oregon, 1928
- ItemWWASPSL1-067 - Spokane, Portland, and Seattle (SP&S) North Bank Freighthouse, Portland, Oregon, 1928
- ItemWWASPSL2-036 - Spokane, Portland, and Seattle (SP&S) Depot at Butler, Washington, Butler, Washington, undated
- ItemWWASPSL2-038 - Spokane, Portland, and Seattle (SP&S) Depot at Butler, Washington, Butler, Washington, undated
- 72 more...