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
- 210 more...
- ItemWerkema341 - Northern Pacific hopper car number 76864 at Albuquerque, New Mexico, in 1978.
- ItemWerkema342 - Northern Pacific hopper car number 76899 at Amarillo, Texas, in 1979.
- ItemWerkema343 - Northern Pacific hopper car number 76963 at Denver, Colorado, in 1980.
- ItemWerkema344 - Northern Pacific hopper car number 76999 at Amarillo, Texas, in 1980.
- ItemWerkema346 - Western Fruit Express 41-foot, ice-refrigerator car 704771 at Pasco, Washington, in 1981.
- ItemWerkema347 - Western Fruit Express 41-foot, ice-refrigerator car 705160 at Pasco, Washington, in 1981.
- ItemWerkema348 - Western Fruit Express 41-foot, ice-refrigerator car 705176 at Pasco, Washington, in 1981.
- ItemWerkema349 - Northern Pacific ice-refrigerator car 207721 at the Northwest Railway Museum in Snoqualmie, Washington, in 2005.
- ItemWerkema350 - Northern Pacific refrigerator car NPM 496 at an unknown location in 1971.
- 4 more...