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 3009 - Electric Locomotives
- Itemimg172 - Great Northern Electric Locomotives 5002B and 5002A at Skykomish, Washington, 1953
- Itemimg173 - Great Northern Electric Locomotive 5006A at Skykomish, Washington, undated
- Itemimg174 - Great Northern Electric Locomotive 5011 at Cascade Tunnel, Washington, 1928
- Itemimg175 - Great Northern Electric Locomotive 5012 at Cashmere, Washington, 1956
- Itemimg176 - Great Northern Electric Locomotive 5016 at Skykomish, Washington, undated
- Itemimg177 - Great Northern Electric Locomotive 5018 at Skykomish, Washington, undated
- Itemimg178 - Great Northern Electric Locomotive 5018 at Skykomish, Washington, undated
- Itemimg399 - Great Northern Electric Locomotive at Chumstick, Washington, undated