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
- 300 more...
- ItemWWAGD-52-338 - Great Northern Diesel Locomotive 504, undated
- ItemWWAGD-52-339 - Great Northern Diesel Locomotive 504, undated
- ItemWWAGD-52-342 - Great Northern Diesel Locomotive 506 at Saint Paul, Minnesota, 1968
- ItemWWAGD-52-344 - Great Northern Diesel Locomotive 506, 1982
- ItemWWAGD-52-345 - Great Northern Diesel Locomotive 506 at Saint Paul, Minnesota, 1963
- ItemWWAGD-52-349 - Great Northern Diesel Locomotive 508, 1980
- ItemWWAGD-52-351 - Great Northern Diesel Locomotive 509 at Saint Paul, Minnesota, 1968
- ItemWWAGD-52-352 - Great Northern Diesel Locomotive 510 at Saint Paul, Minnesota, 1967
- ItemWWAGD-52-353 - Great Northern Diesel Locomotive 510, undated
- 108 more...