Railroad Archives Online
- CollectionD0063 - Walter W. Ainsworth Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3002 - Diesel Locomotives
- 183 more...
- ItemWWAGD-52-198 - Great Northern Diesel Locomotive 321 at Vancouver, Washington, undated
- ItemWWAGD-52-199 - Great Northern Diesel Locomotive 320 at Seattle, Washington, 1967
- ItemWWAGD-52-200 - Great Northern Diesel Locomotive 321 at Seattle, Washington, 1969
- ItemWWAGD-52-201 - Great Northern Diesel Locomotive 321 at Wenatchee, Washington, 1967
- ItemWWAGD-52-202 - Great Northern Diesel Locomotive 322 at Bucoda, Washington, undated
- ItemWWAGD-52-203 - Great Northern Diesel Locomotive 322 at Wenatchee, Washington, 1972
- ItemWWAGD-52-204 - Great Northern Diesel Locomotive 323 at Seattle, Washington, 1967
- ItemWWAGD-52-205 - Great Northern Diesel Locomotive 324 at Portland, Oregon, undated
- ItemWWAGD-52-207 - Great Northern Diesel Locomotive 327, undated
- 225 more...