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
- 292 more...
- ItemWWAGD-52-327 - Great Northern Diesel Locomotive 502, undated
- ItemWWAGD-52-328 - Great Northern Diesel Locomotive 502 at Saint Paul, Minnesota, 1963
- ItemWWAGD-52-329 - Great Northern Diesel Locomotive 502 at Saint Paul, Minnesota, 1967
- ItemWWAGD-52-330 - Great Northern Diesel Locomotive 512 at Duluth, Minnesota, 1967
- ItemWWAGD-52-333 - Great Northern Diesel Locomotive 502 at Superior, Wisconsin, 1969
- ItemWWAGD-52-334 - Great Northern Diesel Locomotive 503, undated
- ItemWWAGD-52-336 - Great Northern Diesel Locomotive 503, undated
- ItemWWAGD-52-337 - Great Northern Diesel Locomotive 503, undated
- ItemWWAGD-52-338 - Great Northern Diesel Locomotive 504, undated
- 116 more...