Railroad Archives Online
- CollectionE0018 - Norm Keyes Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3001 - Steam Locomotives
- 435 more...
- Item40.S.52.04 - Great Northern Steam Locomotive 521, undated
- Item40.S.52.05 - Great Northern Steam Locomotive 521 at Devils Lake, North Dakota, undated
- Item40.S.52.06 - Great Northern Steam Locomotive 522 at Glendive, Montana, 1934
- Item40.S.52.07 - Great Northern Steam Locomotive 523 at Great Falls, Montana, 1949
- Item40.S.52.08 - Great Northern Steam Locomotive 521 at Hillyard, Washington, 1946
- Item40.S.52.09 - Great Northern Steam Locomotive 523 at Great Falls, Montana, 1949
- Item40.S.52.10 - Great Northern Steam Locomotive 525, undated
- Item40.S.52.11 - Great Northern Steam Locomotive 527 at Hillyard, Washington, 1946
- Item40.S.52.12 - Great Northern Steam Locomotive 538, undated
- 631 more...