Railroad Archives Online
- ФондовиD0011 - James M. Fredrickson Collection
- Серија010 - Other Railroads
- Подсерија014 - Photographs
- 003 - Railroads--Buildings and Structures
- 003 - Maintenance Facilities
- ЈединицаJMF11-10405.0 - Sierra Railway Roundhouse at Jamestown, California in June, 1974.
- ЈединицаJMF19-13997.0 - Missouri Pacific Railroad roundhouse at Little Rock, Arkansas on July 7, 1982.