Railroad Archives Online
- ArkivD0170a - Cascade Rail Foundation Walt Ainsworth Photograph Collection
- Serie002 - Chicago, Milwaukee, St. Paul, and Pacific Railroad Company
- Underserie014 - Photographs
- 003 - Railroads--Buildings and Structures
- 009 - Railroads - Servicing facilities
- ObjektWWAMP2440 - Milwaukee Road facilities at Sumner, Washington, undated.