Railroad Archives Online
- CollectionD0011 - James M. Fredrickson Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2004 - Railroad Tracks
- Subseries Level 3003 - Railroad yards
- 29 more...
- ItemJMF04-03205.0 - Northern Pacific passenger yard at Billings, Montana, circa 1950.
- ItemJMF04-03206.0 - Northern Pacific passenger yard at Billings, Montana, circa 1950.
- ItemJMF04-03207.0 - Northern Pacific passenger yard at Billings, Montana, circa 1950.
- ItemJMF04-03209.0 - Northern Pacific passenger yard at Billings, Montana, circa 1950.
- ItemJMF04-02639.0 - Northern Pacific yard at Lester, Washington, circa 1900.