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
- 4 more...
- 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.
- ItemWerkema028 - Northern Pacific 143 in Seattle, Washington, in 1962.
- ItemWerkema029 - Northern Pacific 201-308-302-312 parked in Spokane, Washington in 1968.
- ItemWerkema030 - Northern Pacific freight power 285 with 7005B prepare to leave Livingston, Montana, in 1965.
- ItemWerkema031 - Northern Pacific 360 in St. Paul, Minnesota, in 1967.
- 42 more...