Railroad Archives Online
- CollectionD0063 - Walter W. Ainsworth Collection
- Series010 - Other Railroads
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3003 - Maintenance Facilities
- WWAPC0317 - Columbia and Puget Sound Railroad maintenance and servicing facilities at Seattle, Washington, circa 1912.
- WWAPCN0348 - Columbia and Puget Sound Railroad maintenance and servicing facilities at Seattle, Washington, circa 1915.
- ItemWWASPSL1-019 - Northern Pacific Terminal Company Engine House, Portland, Oregon, July 29, 1912
- ItemWWASPSL1-020 - Northern Pacific Terminal Company Engine House, Portland, Oregon, July 26, 1912
- ItemWWASPSL1-021 - Northern Pacific Terminal Company Engine House, Portland, Oregon, July 25, 1912
- ItemWWASPSL8-112 - Astoria & Columbia River Railroad Roundhouse at Astoria, Oregon, undated