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
- 31 more...
- ItemWingfield.97 - Great Northern Diesel Locomotive 16 at Vancouver, British Columbia, 1968
- ItemWingfield.98 - Great Northern Diesel Locomotive 151 at Spokane, Washington, 1968
- ItemWingfield.99 - Great Northern Diesel Locomotives 151, 2528, 450D at Spokane, Washington, 1968
- ItemWingfield.101 - Great Northern Diesel Locomotive 200 at Spokane, Washington, 1968
- ItemWingfield.102 - Great Northern Diesel Locomotive 2509, 2517, 2519, 2525 at Spokane, Washington, 1968
- ItemWingfield.103 - Great Northern Diesel Locomotive 2528 at Spokane, Washington, 1968
- ItemWingfield.231 - Diesel Locomotives Great Northern 131 with Spokane, Portland & Seattle 311 at Spokane, Washington, 1968
- ItemWingfield.252 - Diesel Locomotives Great Northern 685 and Spokane, Portland & Seattle 151 at Spokane, Washington, 1968