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 3002 - Diesel locomotives
- 569 more...
- ItemJMF02-03762.0 - Northern Pacific diesel locomotive 6001 at Wymer, Washington, in 1944.
- ItemJMF02-03764.0 - Northern Pacific diesel locomotive 5407 at Bellevue, Washington, in 1955.
- ItemJMF02-03765.0 - Northern Pacific diesel locomotive 5407 at Cathcart, Washington, in 1955.
- ItemJMF02-03766.0 - Northern Pacific diesel locomotive 239 at Wilburton, Washington, in 1970.
- ItemJMF02-03767.0 - Northern Pacific diesel locomotive 239 at Renton, Washington, in 1970.
- ItemJMF02-03767.1 - Northern Pacific diesel locomotive 239 at Black River, Washington, in 1970.
- ItemJMF02-03767.2 - Northern Pacific diesel locomotive 239 at Black River, Washington, in 1970.
- ItemJMF02-03767.3 - Northern Pacific diesel locomotive 239 at Black River, Washington, in 1970.
- ItemJMF02-03768.0 - Northern Pacific diesel locomotive 239 at Renton, Washington, in 1970.
- 71 more...