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
- 64 more...
- ItemWerkema167 - Northern Pacific box car 27316 at Denver, Colorado, in 1982.
- ItemWerkema168 - Northern Pacific box car 26969 at Longmont, Colorado, in 1978.
- ItemWerkema169 - Northern Pacific box car 26969 at Longmont, Colorado, in 1978.
- ItemWerkema170 - Northern Pacific box car 28014 at Denver, Colorado, in 1970.
- 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.
- 150 more...