Railroad Archives Online
- ArquivoD0142 - Alden M. Raney Collection
- Série004 - Northern Pacific Railroad Company materials
- Subsérie014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 002 - 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.
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