Railroad Archives Online
- CollectionD0011 - James M. Fredrickson Collection
- Series008 - Union Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3001 - Steam Locomotives
- ItemJMF13-05710.0 - Union Pacific Railroad steam locomotive number 3181 at Tacoma, Washington in 1935.
- ItemJMF13-05711.0 - Union Pacific Railroad steam locomotive number 3203 at Portland, Oregon, undated.
- ItemJMF13-05712.0 - Union Pacific Railroad steam locomotive number 3203 at Tacoma, Washington in 1936.
- ItemJMF13-05713.0 - Union Pacific Railroad steam locomotive number 3223 at Tacoma, Washington in 1935.
- ItemJMF13-05713.1 - Union Pacific Railroad steam locomotive number 3224 at Bonneville, Oregon in 1939.
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