Railroad Archives Online
- CollectionD0063 - Walter W. Ainsworth Collection
- Series001 - Burlington Northern Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2004 - Railroad tracks
- Subseries Level 3001 - Railroad mainline
- 12 more...
- ItemWWASPSL7-081 - Burlington Northern Mainline at Fish Lake Junction, Washington, March 6, 1986
- ItemWWASPSL7-082 - Burlington Northern Mainline at Fish Lake Junction, Washington, June 29, 1987
- ItemWWASPSL7-083 - Burlington Northern Mainline at Fish Lake Junction, Washington, March 20, 1986
- ItemWWASPSL8-005 - Burlington Northern Mainline at Linnton, Oregon, undated
- ItemWWASPSL8-156 - Burlington Northern Track near Astoria, Oregon, undated
- ItemWWASPSL9-001 - Burlington Northern Track at Warrenton, Oregon, circa 1970
- ItemWWASPSL5-086 - Burlington Northern Overhead View of Mainline and Tunnel at Wishram, Washington, undated