Railroad Archives Online
- CollectionD0011 - James M. Fredrickson Collection
- Series001 - Burlington Northern Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3005 - Signals
- ItemJMF04-02438.0 - Burlington Northern dispatchers office at Tacoma, Washington, in December 1970.
- ItemJMF04-02439.0 - Burlington Northern dispatchers office at Tacoma, Washington, in December 1970.
- ItemJMF04-02470.0 - Burlington Northern signal equipment at Tacoma, Washington, in 1982.
- ItemJMF04-02471.0 - Burlington Northern train dispatcher Duke Tone at Tacoma, Washington, in 1979.
- ItemJMF04-02472.0 - Burlington Northern signal equipment at Tacoma, Washington, in 1979.