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 3005 - Maintenance of Way cars
- 12 more...
- ItemWerkema277 - Northern Pacific open hopper car number 87606 at Broomfield, Colorado, in 1989.
- ItemWerkema279 - Northern Pacific fire car 796 at Pasco, Washington in 1982.
- ItemWerkema280 - Northern Pacific fire car 796 at Pasco, Washington in 1982.
- ItemWerkema281 - Northern Pacific fire car 796 at Pasco, Washington in 1982.
- ItemWerkema282 - Northern Pacific maintenance-of-way flat car 203311 at Pasco, Washington in 1981.
- ItemWerkema283 - Northern Pacific wood box car 200451 at Pasco, Washington, in 1981.
- ItemWerkema284 - Northern Pacific wood box car 200385 at Pasco, Washington, in 1981.
- ItemWerkema285 - Northern Pacific wood box car 200824 at Pasco, Washington, in 1981.
- ItemWerkema286 - Northern Pacific housing flat car 201304 at Denver, Colorado, in 1982.
- 8 more...