Still photographs of locomotives that employ an onboard diesel engine to generate electricity to turn the wheels, as well as locomotives whose diesel engines power the wheels through a gear box or through a hydraulic system.

Still photographs of locomotives that employ an onboard diesel engine to generate electricity to turn the wheels, as well as locomotives whose diesel engines power the wheels through a gear box or through a hydraulic system.

Still photographs of locomotives that employ an onboard diesel engine to generate electricity to turn the wheels, as well as locomotives whose diesel engines power the wheels through a gear box or through a hydraulic system.

Still photographs of locomotives that employ an onboard diesel engine to generate electricity to turn the wheels, as well as locomotives whose diesel engines power the wheels through a gear box or through a hydraulic system.

Still photographs of locomotives that employ an onboard diesel engine to generate electricity to turn the wheels, as well as locomotives whose diesel engines power the wheels through a gear box or through a hydraulic system.

The James Fredrickson Collection Northern Pacific Railroad diesel locomotive photograph subseries is a compilation of photographs concerned with the Northern Pacific Railroad Company diesel locomotives.

The James Fredrickson Collection Union Pacific Railroad diesel locomotive photograph subseries is a compilation of photographs concerned with the Union Pacific Railroad Company diesel locomotives.

Still photographs of locomotives that employ an onboard diesel engine to generate electricity to turn the wheels, as well as locomotives whose diesel engines power the wheels through a gear box or through a hydraulic system.

Still photographs of locomotives that employ an onboard diesel engine to generate electricity to turn the wheels, as well as locomotives whose diesel engines power the wheels through a gear box or through a hydraulic system.

Diesel locomotive photographs from the George Werkema Collection of Burlington Northern Railroad Company subjects, some taken by Mr. Werkema and some from other sources in locations across the western United States.