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
- 107 more...
- ItemWerkema210 - Northern Pacific 50-foot, single plug door refrigerator car 97727 at Berlin, New Mexico, in 1994.
- ItemWerkema211 - Northern Pacific 50-foot, single plug door refrigerator car 97745 at Cle Elum, Washington, in 1987.
- ItemWerkema212 - Northern Pacific 50-foot, single plug door refrigerator car 97798 at Enid, Oklahoma, in 1995.
- ItemWerkema213 - Northern Pacific 50-foot, single plug door refrigerator car 97815 at Idaho Falls, Idaho, in 1975.
- ItemWerkema214 - Northern Pacific 50-foot, single plug door refrigerator car 97834 at Pasco, Washington, in 1982.
- ItemWerkema215 - Northern Pacific 50-foot, single plug door refrigerator car 97836 at Denver, Colorado, in 1990.
- ItemWerkema216 - Northern Pacific 50-foot, single plug door refrigerator car 97849 at Cle Elum, Washington, in 1987.
- ItemWerkema217 - Northern Pacific 50-foot, single plug door refrigerator car 98333 at Cle Elum, Washington, in 1992.
- ItemWerkema218 - Burlington Northern box car number 281075 at Gibbon, Washington, in 1986.
- 107 more...