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 3013 - Railroad Accidents
- ItemAMR-005 - Northern Pacific Railroad Company diesel locomotive 6016D at Portland, Oregon in 1968.
- ItemAMR-067 - Spokane, Portland and Seattle Railway wrecking crane X-25 at Portland, Oregon in 1968.
- ItemAMR-068 - Northern Pacific Railroad Company diesel locomotive 6016D at Portland, Oregon in 1968.
- ItemAMR-069 - Northern Pacific Railroad Company diesel locomotive 6016D at Portland, Oregon in 1968.
- ItemAMR-070 - Northern Pacific Railroad Company diesel locomotive 6016D at Portland, Oregon in 1968.