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
- 203 more...
- Itemimg72 - Great Northern Diesel Locomotive 508, undated
- Itemimg73 - Great Northern Diesel Locomotive 509 at Superior, Wisconsin, 1968
- Itemimg74 - Great Northern Diesel Locomotive 510 at Saint Paul, Wisconsin, 1969
- Itemimg75 - Great Northern Diesel Locomotive 510 at Saint Paul, Wisconsin, 1969
- Itemimg76 - Great Northern Diesel Locomotive 555 at Minneapolis, Minnesota, 1970
- Itemimg77 - Great Northern Diesel Locomotive 560 at Minneapolis, Minnesota, 1964
- Itemimg78 - Great Northern Diesel Locomotive 564 at Superior, Wisconsin, 1970
- Itemimg79 - Great Northern Diesel Locomotive 572 at Superior, Wisconsin, 1962
- Itemimg8 - Great Northern Diesel Locomotive 107 at Vancouver, British Columbia, 1968
- 16 more...