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
- 54 more...
- Itemimg156 - Great Northern Diesel Locomotive 503 at Saint Paul, Minnesota, 1968
- Itemimg157 - Great Northern Diesel Locomotive 506 at Saint Paul, Minnesota, 1968
- Itemimg158 - Great Northern Diesel Locomotive 563 at Minneapolis, Minnesota, 1968
- Itemimg159 - Great Northern Diesel Locomotive 584 at Minneapolis, Minnesota, 1967
- Itemimg16 - Great Northern Diesel Locomotive 220, undated
- Itemimg160 - Great Northern Diesel Locomotive 628 at Minneapolis, Minnesota, 1965
- Itemimg161 - Great Northern Diesel Locomotive 679 at Saint Paul, Minnesota, 1968
- Itemimg162 - Great Northern Diesel Locomotive 721 at Skykomish, Washington, 1965
- Itemimg163 - Great Northern Diesel Locomotive 734 at Monroe, Washington, 1968
- 165 more...