Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3005 - Signals and Signs
- 4 more...
- ItemWerkema578 - Burlington Northern semaphore signals at Gibbon, Washington, in 1986.
- ItemWerkema579 - Burlington Northern semaphore signals at Glade, Washington, in 1986.
- ItemWerkema580 - Burlington Northern signal bridge at Pasco, Washington, in 1986.
- ItemWerkema581 - Burlington Northern signal bridge at Pasco, Washington, in 1986.
- ItemWerkema582 - Northern Pacific semaphore display at the Northwest Railway Museum in Snoqualmie, Washington, in 2005.
- ItemWerkema583 - Burlington Northern station sign at Cunningham, Washington, in 1986.
- ItemWerkema584 - Burlington Northern station sign at Cunningham, Washington, in 1986.
- ItemWerkema585 - Burlington Northern station sign at Easton, Washington, in 1987.
- ItemWerkema586 - Burlington Northern station sign at Easton, Washington, in 1987.
- 3 more...