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 3005 - Maintenance of Way cars
- 20 more...
- ItemWWASPSL7-041 - Spokane, Portland, and Seattle (SP&S) Work Train, Box Canyon Trestle, Washington, undated
- ItemWWASPSL7-042 - Spokane, Portland, and Seattle (SP&S) Work Train, Box Canyon Trestle, Washington, undated
- ItemWWASPSL7-043 - Spokane, Portland, and Seattle (SP&S) Work Train, Box Canyon Trestle, Washington, undated
- ItemWWASPSL7-054 - Spokane, Portland, and Seattle (SP&S) Work Train at Cow Creek Trestle, Washington, undated
- ItemWWASPSL7-055 - Spokane, Portland, and Seattle (SP&S) Work Train at Cow Creek Trestle, Washington, undated
- ItemWWASPSL7-056 - Spokane, Portland, and Seattle (SP&S) Work Crew at Cow Creek Trestle, Washington, undated