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
- 19 more...
- ItemWWASPSL7-005 - Spokane, Portland, and Seattle (SP&S) Mainline near Snake River Junction, Washington, undated
- ItemWWASPSL7-011 - Spokane, Portland, and Seattle (SP&S) Mainline, Washington State, undated
- ItemWWASPSL7-032 - Spokane, Portland, and Seattle (SP&S) Mainline and Siding, Washington State, undated
- ItemWWASPSL8-022 - Spokane, Portland, and Seattle (SP&S) Mainline at Goble, Oregon, July 1968
- ItemWWASPSL8-031 - Spokane, Portland, and Seattle (SP&S) Mainline at Rainier, Oregon, undated
- ItemWWASPSL8-074 - Spokane, Portland, and Seattle (SP&S) Mainline at Tongue Point, Oregon, January 13, 1952
- ItemWWASPSL8-147 - Spokane, Portland, and Seattle (SP&S) Track at Astoria, Oregon, undated
- ItemWWASPSL9-018 - Spokane, Portland and Seattle (SP&S) Tracks at Clatsop Beach, Oregon, undated
- ItemWWASPSL9-079 - Spokane, Portland, and Seattle (SP&S) Tracks Along Columbia River, Oregon, undated.
- 9 more...