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
- 68 more...
- ItemWerkema171 - Northern Pacific box car 28014 at Denver, Colorado, in 1970.
- ItemWerkema172 - Burlington Northern box car 950289 at the Northwest Railway Museum in Snoqualmie, Washington, in 2005.
- ItemWerkema173 - Northern Pacific box car 28014 at Denver, Colorado, in 1967.
- ItemWerkema174 - Northern Pacific box car 28417 at the Northwest Railway Museum in Snoqualmie, Washington, in 2005.
- ItemWerkema175 - Northern Pacific box car 29232 at Albuquerque, New Mexico, in 1980.
- ItemWerkema176 - Northern Pacific box car 36219 at Albuquerque, New Mexico, in 1978.
- ItemWerkema177 - Northern Pacific 50-foot, double sliding door box car 38501 on blocks in Rushville, Missouri, in 1990.
- ItemWerkema178 - Northern Pacific box car 39626 at Denver, Colorado, in 1967.
- ItemWerkema179 - Northern Pacific box car 42284 at Denver, Colorado, in 1976.
- 146 more...