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
- 2431 more...
- ItemJMF00-01640.0 - Northern Pacific steam locomotive 4017.
- ItemJMF00-01640.1 - Northern Pacific steam locomotive 4017 at Auburn, Washington, in 1934.
- ItemJMF00-01641.0 - Northern Pacific steam locomotive 4018 at Martin, Washington, in 1944.
- ItemJMF00-01642.0 - Northern Pacific steam locomotive 4018 at Easton, Washington, in 1938.
- ItemJMF00-01643.0 - Northern Pacific steam locomotive 4019 at Yakima, Washington, in 1934.
- ItemJMF00-01644.0 - Northern Pacific steam locomotive 4019 at Brainerd, Minnesota, in 1950.
- ItemJMF00-01645.0 - Northern Pacific steam locomotive 4019 at Tacoma, Washington, in 1937.
- ItemJMF00-01646.0 - Northern Pacific steam locomotive 4021 at Garrison, Montana, in 1946.
- ItemJMF00-01647.0 - Northern Pacific steam locomotive 4021 at South Tacoma, Washington, in 1938.
- 205 more...