Railroad Archives Online
- ФондовиD0011 - James M. Fredrickson Collection
- Серија008 - Union Pacific Railroad Company
- Подсерија014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 006 - Cabooses (Railroads)
- ЈединицаJMF02-03826.1 - Union Pacific caboose at Tacoma-McCarver St, Washington, in 1962.
- ЈединицаJMF13-05832.1 - Union Pacific Railroad caboose, undated.