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
- 19 more...
- ItemWerkema122 - Northern Pacific box car 3168 at Longmont, Colorado, in 1980.
- ItemWerkema123 - Northern Pacific boxcar 3986 at Albuquerque, New Mexico, in 1972.
- ItemWerkema124 - Northern Pacific boxcar 4632 at Pasco, Washington, in 1981.
- ItemWerkema125 - Northern Pacific box car number 4893 at Acme, Washington, in 1977.
- ItemWerkema126 - Northern Pacific box car number 4899 at Acme, Washington, in 1977.
- ItemWerkema127 - Northern Pacific boxcar 4079 at Albuquerque, New Mexico, in 1978.
- ItemWerkema128 - Northern Pacific boxcar 4302 at Albuquerque, New Mexico, in 1978.
- ItemWerkema129 - Northern Pacific boxcar 4402 at Albuquerque, New Mexico, in 1978.
- ItemWerkema130 - Northern Pacific box car number 5069 at Abo Canyon, New Mexico, in 1982.
- 195 more...