Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series001 - Burlington Northern Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2004 - Railroad Tracks
- Subseries Level 3001 - Mainline Photos
- ItemWerkema628 - Burlington Northern main and yard tracks at Cle Elum, Washington, in 1987.
- ItemWerkema629 - Burlington Northern switchstand at Eltropia, Washington, in 1986.
- ItemWerkema630 - Burlington Northern switchstand at Easton, Washington, in 1887.
- ItemWerkema633 - Burlington Northern switchstand at Glade, Washington, in 1986.