Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series001 - Burlington Northern Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3005 - Maintenance of Way cars
- ItemWerkema288 - Northern Pacific car 207779 at Kahlotus, Washington, in 1986.
- ItemWerkema289 - Northern Pacific car 207779 at Kahlotus, Washington, in 1986.