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
- 28 more...
- Itemimg132 - Great Northern Diesel Locomotive 140 at Minneapolis, Minnesota, 1964
- Itemimg133 - Great Northern Diesel Locomotive 180 at Superior, Wisconsin, 1958
- Itemimg134 - Great Northern Diesel Locomotive 190 at Minneapolis, Minnesota, 1968
- Itemimg135 - Great Northern Diesel Locomotive 206 at Minneapolis, Minnesota, 1968
- Itemimg136 - Great Northern Diesel Locomotive 222 at Interbay, Washington, 1963
- Itemimg137 - Great Northern Diesel Locomotive 230 at Vancouver, Washington, 1965
- Itemimg138 - Great Northern Diesel Locomotive 257A at Fort Worth, Texas, 1964
- Itemimg139 - Great Northern Diesel Locomotive 262B at Vancouver, British Columbia, 1964
- Itemimg14 - Great Northern Diesel Locomotive 182, undated
- 191 more...