Railroad Archives Online
- ФондовиD0036 - George Werkema Collection
- Серија004 - Northern Pacific Railroad Company
- Подсерија014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 003 - Freight Cars
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- ЈединицаWerkema204 - Northern Pacific 50-foot, single plug door refrigerator car 97090 at Albuquerque, New Mexico, in 1979.
- ЈединицаWerkema205 - Northern Pacific 50-foot, single plug door refrigerator car 97552 at Albuquerque, New Mexico, in 1980.
- ЈединицаWerkema206 - Northern Pacific 50-foot, single plug door refrigerator car 97629 at Albuquerque, New Mexico, in 1979.
- ЈединицаWerkema207 - Northern Pacific 50-foot, single plug door refrigerator car 97638 at Albuquerque, New Mexico, in 1978.
- ЈединицаWerkema208 - Northern Pacific 50-foot, single plug door refrigerator car 97638 at Albuquerque, New Mexico, in 1990.
- ЈединицаWerkema209 - Northern Pacific 50-foot, single plug door refrigerator car 97642 at Albuquerque, New Mexico, in 1980.
- ЈединицаWerkema210 - Northern Pacific 50-foot, single plug door refrigerator car 97727 at Berlin, New Mexico, in 1994.
- ЈединицаWerkema211 - Northern Pacific 50-foot, single plug door refrigerator car 97745 at Cle Elum, Washington, in 1987.
- ЈединицаWerkema212 - Northern Pacific 50-foot, single plug door refrigerator car 97798 at Enid, Oklahoma, in 1995.
- 113 више...