Railroad Archives Online
- CollectionD0011 - James M. Fredrickson Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3009 - Electric Locomotives
- ItemJMF14-05534.0 - Great Northern Railway electric locomotive number 5004A at Skykomish, Washington, undated.
- ItemJMF14-05535.0 - Great Northern Railway electric locomotive number 5004A-B, undated.
- ItemJMF14-05536.0 - Great Northern Railway electric locomotive number 5004A at Skykomish, Washington, undated.
- ItemJMF14-05537.0 - Great Northern Railway electric locomotive number 5004A at Skykomish, Washington, undated.
- ItemJMF14-05538.0 - Great Northern Railway electric locomotive number 5006A at Wenatchee, Washington, undated.
- 15 more...