Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3003 - Freight Cars
- 110 more...
- Itemimg525 - Great Northern Boxcar 6738 at Bellingham, Washington, 1977
- Itemimg526 - Great Northern Boxcar 6774 at Albuquerque, New Mexico, 1979
- Itemimg527 - Great Northern Boxcar 6788 at Boulder, Colorado, 1978
- Itemimg528 - Great Northern Boxcar 6833 at Albuquerque, New Mexico, 1979
- Itemimg529 - Great Northern Boxcar 7047 at Albuquerque, New Mexico, 1978
- Itemimg530 - Great Northern Boxcar 7051 at Bellingham, Washington, 1977
- Itemimg531 - Great Northern Boxcar 39450, undated
- Itemimg532 - Great Northern Boxcar 39509 at Denver, Colorado, 1965
- Itemimg533 - Great Northern Boxcar 39515 at Denver, Colorado, 1966
- 400 more...