Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3003 - Freight Cars
- 95 more...
- ItemWerkema198 - Northern Pacific 50-foot, single plug door refrigerator car 96113 at Albuquerque, New Mexico, in 1997.
- ItemWerkema199 - Northern Pacific 50-foot, single plug door refrigerator car 96120 at Plainview, Texas, in 1985.
- ItemWerkema200 - Northern Pacific 50-foot, single plug door refrigerator car 96158 at Denver, Colorado, in 1982.
- ItemWerkema201 - Northern Pacific 50-foot, single plug door refrigerator car 96179 at Bellingham, Washington, in 1982.
- ItemWerkema202 - Northern Pacific 50-foot, single plug door refrigerator car 97007 at Albuquerque, New Mexico, in 1980.
- ItemWerkema203 - Northern Pacific 50-foot, single plug door refrigerator car 97053 at Broomfield, Colorado, in 1975.
- ItemWerkema204 - Northern Pacific 50-foot, single plug door refrigerator car 97090 at Albuquerque, New Mexico, in 1979.
- ItemWerkema205 - Northern Pacific 50-foot, single plug door refrigerator car 97552 at Albuquerque, New Mexico, in 1980.
- ItemWerkema206 - Northern Pacific 50-foot, single plug door refrigerator car 97629 at Albuquerque, New Mexico, in 1979.
- 119 more...