Railroad Archives Online
- CollectionD0063 - Walter W. Ainsworth Collection
- Series010 - Other Railroads
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3001 - Bridges
- ItemWWAPC0397 - Columbia and Puget Sound Railroad bridge at Elliott, Washington in 1911.
- ItemWWAPC0439 - Columbia and Puget Sound Railroad bridge at Maple Valley, Washington in 1911.
- ItemWWAPC0440 - Columbia and Puget Sound Railroad bridge at Maple Valley, Washington in 1911.
- ItemWWAPC0441 - Columbia and Puget Sound Railroad bridge at Maple Valley, Washington in 1911.
- ItemWWAPC0491 - Columbia and Puget Sound Railroad bridge near Taylor, Washington, circa 1910.
- ItemWWAPCN0187 - Columbia & Puget Sound Railroad truss bridge at Maple Valley, Washington in November 1911.
- ItemWWASPSL1-025 - Southern Pacific and Oregon-Washigton Railroad & Navigation Company Original Steel Bridge Over the Willamette River, Portland, Oregon, undated
- ItemWWASPSL5-001 - Oregon Trunk Celilo Bridge at Wishram, Washington, undated
- 11 more...