Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3002 - Diesel Locomotives
- 130 more...
- Itemimg370 - Great Northern Diesel Locomotive 509 at Grand Forks, North Dakota, 1970
- Itemimg371 - Great Northern Diesel Locomotive 464A at Fargo, North Dakota, undated
- Itemimg372 - Great Northern Diesel Locomotive 351C, 1959
- Itemimg373 - Great Northern Diesel Locomotive 358A, undated
- Itemimg374 - Great Northern Diesel Locomotive 332 at Glacier Park, Montana, 1969
- Itemimg375 - Great Northern Diesel Locomotive 361A at Summit, Montana, undated
- Itemimg376 - Great Northern Diesel Locomotive at Marias Pass, Montana, 1956
- Itemimg377 - Great Northern Diesel Locomotive at Marias Pass, Montana, 1956
- Itemimg378 - Great Northern Diesel Locomotive at Summit, Montana, 1956
- 89 more...