Railroad Archives Online
- CollectionD0063 - Walter W. Ainsworth Collection
- Series010 - Other Railroads
- Subseries Level 1014 - Photographs
- Subseries Level 2004 - Railroad tracks
- Subseries Level 3001 - Railroad mainline
- ItemWWAPC0308 - Puget Sound Shore Railroad and Columbia and Puget Sound Railroad mainlines at Seattle, Washington, circa 1890.
- ItemWWAPC0342 - Railroad mainlines at Allentown, Washington in 1927.
- ItemWWAPC0401 - Columbia and Puget Sound/Chicago Milwaukee and Puget Sound Railroad mainline at Indian, Washington in 1911.
- ItemWWAPC0599 - Seattle-Tacoma Interurban Railroad mainline at south Seattle, Washington, circa 1927.