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 3002 - Diesel Locomotives
- 211 more...
- Itemimg8 - Great Northern Diesel Locomotive 107 at Vancouver, British Columbia, 1968
- Itemimg80 - Great Northern Diesel Locomotive 576 at Minneapolis, Minnesota, 1966
- Itemimg81 - Great Northern Diesel Locomotive 578 at Hillyard, Washington, 1965
- Itemimg82 - Great Northern Diesel Locomotive 582, undated
- Itemimg83 - Great Northern Diesel Locomotive 600 at Saint Paul, Minnesota, 1971
- Itemimg84 - Great Northern Diesel Locomotive 607 at Bellingham, Washington, 1968
- Itemimg85 - Great Northern Diesel Locomotive 607 at Bellingham, Washington, 1968
- Itemimg86 - Great Northern Diesel Locomotive 637 at Grove City, Minnesota, undated
- Itemimg87 - Great Northern Diesel Locomotive 640 at Superior, Wisconsin, 1975
- 8 more...