Railroad Archives Online
- CollectionD0142 - Alden M. Raney Collection
- Series004 - Northern Pacific Railroad Company materials
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3002 - Diesel Locomotives
- ItemAMR-003 - Northern Pacific Railroad Company diesel locomotives 6403D at Portland, Oregon in 1966.
- ItemAMR-004 - Northern Pacific Railroad Company diesel locomotives 6403D at Portland, Oregon in 1966.
- ItemAMR-019 - Northern Pacific Railroad Company diesel locomotive 6017D at Portland, Oregon in 1966.
- ItemAMR-021 - Northern Pacific Railroad Company diesel locomotive 6511C at Portland, Oregon in 1966.
- ItemAMR-022 - Northern Pacific Railroad Company diesel locomotive 6017D at Portland, Oregon in 1966.
- ItemAMR-023 - Northern Pacific Railroad Company diesel locomotive 6511C at Portland, Oregon in 1966.
- ItemAMR-034 - Northern Pacific Railroad Company diesel locomotive 6009A at Portland, Oregon in 1966.
- ItemAMR-055 - Northern Pacific Railroad Company diesel locomotive 5405D at Portland, Oregon (undated).
- 21 more...