Railroad Archives Online
- CollectionD0153 - Doug Wingfield Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3002 - Diesel Locomotives
- 24 more...
- ItemWingfield.87 - Great Northern Diesel Locomotive 562 at Superior, Wisconsin, 1961
- ItemWingfield.89 - Great Northern Diesel Locomotive 568 at Spokane, Washington, 1968
- ItemWingfield.90 - Great Northern Diesel Locomotive 568 at Spokane, Washington, 1968
- ItemWingfield.91 - Great Northern Diesel Locomotive 569 at Spokane, Washington, 1968
- ItemWingfield.94 - Great Northern Diesel Locomotive 325 at Sandpoint, Idaho, 1968
- ItemWingfield.95 - Great Northern Diesel Locomotive 330 at Sandpoint, Idaho, 1968
- ItemWingfield.96 - Great Northern Diesel Locomotive 330 at Sandpoint, Idaho, 1968
- ItemWingfield.97 - Great Northern Diesel Locomotive 16 at Vancouver, British Columbia, 1968
- ItemWingfield.98 - Great Northern Diesel Locomotive 151 at Spokane, Washington, 1968
- 6 more...