Railroad Archives Online
- FondoD0011 - James M. Fredrickson Collection
- Serie010 - Other Railroads
- Sottoserie014 - Photographs
- 004 - Railroad tracks
- 003 - Railroad yards
- Unità documentariaJMF19-14097.0 - Pennsylvania Railroad Interlocking control tower at Pittsburg, Pennsylvania on July 13, 1964.
- Unità documentariaJMF19-14250.0 - New Haven Railroad interlocking tower at Old Saybrook, Connecticut on January 28, 1977.
- Unità documentariaJMF19-13852.0 - Chicago & North Western Railway control tower at Proviso, Illinois on July 26, 1986.
- Unità documentariaJMF19-14221.8 - American Rail Tours rail yard at Pompano Beach, Florida on July 28, 1987.
- Unità documentariaJMF19-13890.0 - CSX Transportation yard tower at Baldwin, Florida on July 29, 1987.
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