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
- ItemWerkema002 - Northern Pacific 119, and slug ET-1 wait near the Pasco, Washington, classification yard in 1970.
- ItemWerkema004 - Northern Pacific 214 with Northern Pacific 337 in Portland, Oregon in 1962.
- ItemWerkema005 - Northern Pacific 250 is waiting at Sumas, Washington, in1968.
- ItemWerkema007 - Northern Pacific 900 and 903 by Rices Point roundhouse in Duluth, Minnesota, in 1963.
- ItemWerkema023 - Northern Pacific 6, the South Tacoma shop switcher in South Tacoma Shops in 1956.
- ItemWerkema024 - Northern Pacific 102 at the Northtown engine facility in Minneapolis, Minnesota in 1964.
- ItemWerkema025 - Northern Pacific 105 on main line in St. Paul, Minnesota, in January 1968.
- ItemWerkema026 - Northern Pacific 107 in St. Paul, Minnesota in 1967.
- ItemWerkema027 - Northern Pacific 118 in St. Paul, Minnesota in 1967.
- 46 more...