Railroad Archives Online
- CollectionD0011 - James M. Fredrickson Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroad Buildings and Structures
- Subseries Level 3005 - Signals and Signs
- 48 more...
- ItemJMF04-02451.0 - Northern Pacific signal equipment at Tacoma, Washington, in 1967.
- ItemJMF04-02452.0 - Northern Pacific signal equipment at Tacoma, Washington, in 1967.
- ItemJMF04-02453.0 - Northern Pacific signal equipment at Tacoma, Washington, in 1967.
- ItemJMF04-02454.0 - Northern Pacific signal equipment at Tacoma, Washington, in 1967.
- ItemJMF04-02455.0 - Northern Pacific signal equipment at Tacoma, Washington, in 1967.
- ItemJMF04-02456.0 - Northern Pacific signal equipment at Tacoma, Washington, in 1967.
- ItemJMF04-02457.0 - Northern Pacific signal equipment at Tacoma, Washington, in 1967.
- ItemJMF04-02458.0 - Northern Pacific signal equipment at Tacoma, Washington, in 1967.
- ItemJMF04-02459.0 - Northern Pacific signal equipment at Tacoma, Washington, in 1967.
- 14 more...