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
- 66 more...
- Itemimg167 - Great Northern Diesel Locomotive 2500 at Minneapolis, Minnesota, 1968
- Itemimg168 - Great Northern Diesel Locomotive 2521 at Vancouver, British Columbia, 1967
- Itemimg169 - Great Northern Diesel Locomotive 2527 at Minneapolis, Minnesota, 1968
- Itemimg17 - Great Northern Diesel Locomotive 227 at Spokane, Washington, undated
- Itemimg170 - Great Northern Diesel Locomotive 3000 at Minneapolis, Minnesota, 1964
- Itemimg171 - Great Northern Diesel Locomotive 3022 at Interbay, Washington, 1964
- Itemimg18 - Great Northern Diesel Locomotive 258A, undated
- Itemimg19 - Great Northern Diesel Locomotive 259A at Superior, Wisconsin, 1966
- Itemimg2 - Great Northern Diesel Locomotive 14 at Vancouver, British Columbia, 1968
- 153 more...