Railroad Archives Online
- FondsD0011 - James M. Fredrickson Collection
- Série003 - Great Northern Railway Company (U.S.)
- Sous-série014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 009 - Electric Locomotives
- PièceJMF14-05534.0 - Great Northern Railway electric locomotive number 5004A at Skykomish, Washington, undated.
- PièceJMF14-05535.0 - Great Northern Railway electric locomotive number 5004A-B, undated.
- PièceJMF14-05536.0 - Great Northern Railway electric locomotive number 5004A at Skykomish, Washington, undated.
- PièceJMF14-05537.0 - Great Northern Railway electric locomotive number 5004A at Skykomish, Washington, undated.
- PièceJMF14-05538.0 - Great Northern Railway electric locomotive number 5006A at Wenatchee, Washington, undated.
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