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 3001 - Railroad mainline
- ItemWWASPSL1-086 - Spokane, Portland, and Seattle (SP&S) Track Washout, North Portland Junction, Oregon, May 30, 1948
- ItemWWASPSL2-007 - Spokane, Portland, and Seattle (SP&S) View of Track Ahead from Coach, Camas, Washington, September 16, 1948
- ItemWWASPSL2-034 - Spokane, Portland, and Seattle (SP&S) Railway Tracks, Cape Horn, Washington, undated
- ItemWWASPSL2-035 - Spokane, Portland, and Seattle (SP&S) Railway Tracks, Cape Horn, Washington, undated
- ItemWWASPSL2-050 - Spokane, Portland, and Seattle (SP&S) Track Under Constructions, Cascades, Washington, 1906
- 32 more...