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
- 5 more...
- ItemWerkema271 - The unloading gate detail of Northern Pacific Hart ballast car 87384 at Denver, Colorado, in 1973.
- ItemWerkema272 - Northern Pacific Hart ballast car 87384 at Denver, Colorado, in 1973.
- ItemWerkema273 - Northern Pacific open hopper car number 87467, at Skykomish, Washington, in 1988.
- ItemWerkema274 - Northern Pacific open hopper car number 87536, at Bellingham, Washington, in 1982.
- ItemWerkema275 - Northern Pacific open hopper car number 87541 at Skykomish, Washington, in 1988.
- ItemWerkema278 - Northern Pacific open hopper car number 87728 at Wallula, Washington, in 1989.
- ItemWerkema276 - Northern Pacific open hopper car number 87546 at Denver, Colorado, in 1989.
- ItemWerkema277 - Northern Pacific open hopper car number 87606 at Broomfield, Colorado, in 1989.
- ItemWerkema279 - Northern Pacific fire car 796 at Pasco, Washington in 1982.
- 15 more...