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
- 170 more...
- Itemimg585 - Great Northern Boxcar 36931 at Denver, Colorado, 1966
- Itemimg586 - Great Northern Boxcar 137030 at Albuquerque, New Mexico, 1978
- Itemimg587 - Great Northern Boxcar 138006 at Denver, Colorado, 1982
- Itemimg588 - Great Northern Boxcar 138018 at Albuquerque, New Mexico, 1982
- Itemimg589 - Great Northern Boxcar 138027 at Plainview, Texas, 1985
- Itemimg590 - Great Northern Boxcar 138038 at Albuquerque, New Mexico, 1983
- Itemimg591 - Great Northern Boxcar 138039 at Boulder, Colorado, 1965
- Itemimg592 - Great Northern Boxcar 138039 at Boulder, Colorado, 1965
- Itemimg593 - Great Northern Boxcar 138044 at Denver, Colorado, 1985
- 340 more...