Railroad Archives Online
- CollectionD0197 - Maple Valley Historical Society Collection
- Series002 - Chicago, Milwaukee, St. Paul, and Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3009 - Electric Locomotives
- ItemP2015.06.24-059 - Chicago, Milwaukee, St. Paul and Pacific Railroad electric locomotive number E2 at Maple Valley, Washington, in 1950.
- ItemP11.14.85 - Chicago, Milwaukee, St. Paul and Pacific Railroad electric locomotive number E5 at Renton, Washington, in 1951.