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 3011 - Railroad cars self-propelled
- 9 more...
- ItemWWASPSD2-084 - Spokane, Portland and Seattle (SP&S) Gas Electric Car Number 1102, Portland, Oregon, undated
- ItemWWASPSD2-085 - Spokane, Portland and Seattle (SP&S) Gas Car Number 1103, undated
- ItemWWASPSD2-086 - Ewbank Motor Car Gas Car Number 333, Vancouver, Washington, May 7, 1915
- ItemWWASPSD2-087 - Ewbank Motor Car Gas Car Number 333, Portland, Oregon, May 1915
- ItemWWASPSD2-088 - Ewbank Motor Car Gas Car Number 333, July 4, 1914
- ItemWWASPSD2-089 - Ewbank Motor Car Gas Car Number 333, Portland, Oregon, May 10, 1915
- ItemWWASPSL1-045 - Spokane, Portland, and Seattle (SP&S) Gas Car and Steam Locomotive, Portland, Oregon, September 25, 1921