How a Diesel Electric locomotive works?

In many parts of the world, diesel-electric locomotives are the primary hauling power for trains. A diesel-electric locomotive is similar to a road vehicle in having an internal combustion engine as the primary source of power. However, the similarity ends there. Internal combustion engines operate efficiently only in a narrow rpm band. For a rail locomotive hauling over 1000 tons of loads, extracting the required torque from an internal combustion engine would require an impractical number of gears. Therefore, a diesel-electric locomotive produces electricity to run its traction motors. The mechanics involved are explained in this video “How diesel-electric locomotives work?”

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