Railroad Archives Online
- CollectionD0063 - Walter W. Ainsworth Collection
- Series008 - Union Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3001 - Steam Locomotives
- ItemWWASPSL3-066 - Union Pacific Steam Locomotive 511 at Vancouver, Washington, undated