Railroad Archives Online
- CollectionE0437 - Jim Parker Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3002 - Diesel Locomotives
- 31 more...
- Item47323 - Northern Pacific Diesel Locomotive Number 6503C, undated
- Item47324 - Northern Pacific Diesel Locomotive Number 6506C, Glendive, Montana, 1968
- Item47325 - Northern Pacific Diesel Locomotive Number 6701A, Rockton, Montana, 1968
- Item47326 - Northern Pacific Diesel Locomotive Number 6701B, Spokane, Washington, 1969
- Item47327 - Northern Pacific Diesel Locomotive Number 6703A, Missoula, Montana, 1969
- Item47374 - Northern Pacific Diesel Locomotive Number 7006D, Sprague, Washington, 1967
- Item47375 - Northern Pacific Diesel Locomotive Number 7004D, Pasco, Washington, 1969
- Item47376 - Northern Pacific Diesel Locomotive Number 7010A, Pasco, Washington, 1968
- Item47377 - Northern Pacific Diesel Locomotive Number 7010A, Pasco, Washington, 1968