Railroad Archives Online
- FondoD0197 - Maple Valley Historical Society Collection
- Serie002 - Chicago, Milwaukee, St. Paul, and Pacific Railroad Company
- Subserie014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 009 - Electric Locomotives
- Unidad documental simpleP2015.06.24-059 - Chicago, Milwaukee, St. Paul and Pacific Railroad electric locomotive number E2 at Maple Valley, Washington, in 1950.
- Unidad documental simpleP11.14.85 - Chicago, Milwaukee, St. Paul and Pacific Railroad electric locomotive number E5 at Renton, Washington, in 1951.