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
- ItemWWAPC0307 - Burlington Northern Santa Fe Railway track at Seattle, Washington, in 1998.
- ItemWWAPC0334 - Pacific Coast Railroad mainline at Seattle, Washington, circa 1975.
- ItemWWAPC0684 - Former Burlington Northern mainline at Maple Valley, Washington, circa 1985.
- ItemWWAPC0734 - Burlington Northern Santa Fe Railroad track at Seattle, Washington, circa 2005.
- ItemWWAPC0735 - Burlington Northern Santa Fe Railroad track at Seattle, Washington, circa 2005.
- ItemWWAPC0736 - Burlington Northern Santa Fe Railroad track at Seattle, Washington, circa 2005.
- ItemWWAPC0737 - Pacific Coast Railroad railroad track at Seattle, Washington, circa 2005.