Railroad Archives Online
- CollectionD0011 - James M. Fredrickson Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3001 - Steam locomotives
- 2394 more...
- ItemJMF00-01604.0 - Northern Pacific steam locomotive 4006 at Martin, Washington, in 1944.
- ItemJMF00-01605.0 - Northern Pacific steam locomotive 4006 at Easton, Washington, in 1938.
- ItemJMF00-01606.0 - Northern Pacific steam locomotive 4006 at South Tacoma, Washington, circa 1938.
- ItemJMF00-01607.0 - Northern Pacific steam locomotive 4007 at Easton, Washington, in 1944.
- ItemJMF00-01608.0 - Northern Pacific steam locomotive 4008 at Schenectady, New York, in 1913.
- ItemJMF00-01609.0 - Northern Pacific steam locomotive 4008 at Tacoma, Washington, in 1938.
- ItemJMF00-01610.0 - Northern Pacific steam locomotive 4008 at Easton, Washington, in 1943.
- ItemJMF00-01611.0 - Northern Pacific steam locomotive 4009, circa 1936.
- ItemJMF00-01612.0 - Northern Pacific steam locomotive 4009 at Easton, Washington, in 1944.
- 242 more...