Railroad Archives Online
- CollectionD0011 - James M. Fredrickson Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2004 - Railroad Tracks
- Subseries Level 3001 - Railroad mainline
- ItemJMF04-02601.0 - Northern Pacific tracks at Eagle Gorge, Washington, circa 1959.
- ItemJMF04-02681.0 - Northern Pacific right of way at Weston, Washington, in 1979.
- ItemJMF04-02739.0 - Northern Pacific tracks at Martin, Washington, in 1945.
- ItemJMF04-02856.0 - Description of Northern Pacific switchback at Stampede Pass, Washington Territory, in 1887.
- ItemJMF04-02860.0 - Northern Pacific switchback at Stampede Pass, Washington Territory, circa 1887.
- ItemJMF04-02868.0 - Northern Pacific mainline at Stampede Pass, Washington Territory, in 1887.
- ItemJMF04-02869.0 - Northern Pacific mainline at Stampede Pass, Washington Territory, in 1887.
- ItemJMF04-02899.0 - Wilkeson, Washington, circa 1910.
- 13 more...