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 3002 - Diesel Locomotives
- 40 more...
- ItemWerkema059 - Northern Pacific Terminal Company 30 operating on the Lake Whatcom Railway at Wickersham, Washington in 2008.
- ItemWerkema404 - Northern Pacific F-9 diesel locomotive 6706A at St. Paul Union Station in Minnesota in 1965.
- ItemWerkema405 - Northern Pacific F-7 diesel locomotive 6509C and the other three units at Livingston, Montana, in 1965.
- ItemWerkema406 - Northern Pacific F-9 diesel locomotive 6702C with the Mainstreeter at Fargo, North Dakota, in 1965.
- ItemWerkema407 - Two Northern Pacific GP-9 diesel locomotives on a branchline in Montana.
- ItemWerkema408 - Northern Pacific GP-9 diesel locomotive 229 and two brother GP-9s lead a freight train.
- ItemWerkema409 - Northern Pacific GP-9 diesel locomotive 300 at Livingston, Montana.
- ItemWerkema410 - Northern Pacific GP-9 diesel locomotive 329 leads a freight train at Centralia, Washington in 1965.
- ItemWerkema411 - Northern Pacific GP-9 diesel locomotive leads a freight train.
- 6 more...