Railroad Archives Online
- CollectionD0063 - Walter W. Ainsworth Collection
- Series007 - Spokane, Portland, and Seattle Railway
- Subseries Level 1014 - Photographs
- Subseries Level 2004 - Railroad tracks
- Subseries Level 3003 - Railroad yards
- ItemWWASPSL1-012 - Spokane, Portland, and Seattle (SP&S) East Side Yard, Portland, Oregon, undated
- ItemWWASPSL1-014 - Spokane, Portland, and Seattle (SP&S) Hoyt Street Yard, Portland, Oregon, undated
- ItemWWASPSL1-043 - Spokane, Portland, and Seattle (SP&S) Railway Yard, Portland, Oregon, undated
- ItemWWASPSL1-055 - Spokane, Portland, and Seattle (SP&S) Hoyt Street Yard, Portland, Oregon, 1948
- ItemWWASPSL1-068 - Spokane, Portland, and Seattle (SP&S) Hoyt Street Yard, Portland, Oregon, 1948
- 13 more...