Railroad Archives Online
- FondiD0170a - Cascade Rail Foundation Walt Ainsworth Photograph Collection
- Serija002 - Chicago, Milwaukee, St. Paul, and Pacific Railroad Company
- Podserija014 - Photographs
- 003 - Railroads--Buildings and Structures
- 009 - Railroads - Servicing facilities
- DokumentWWAMP2440 - Milwaukee Road facilities at Sumner, Washington, undated.