ALCO DL560C
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The ALCO DL560C locomotive was built by the American Locomotive Company (ALCO) for export to India.
In the early 1960s Indian Railways needed a reliable diesel workhorse to gradually replace its steam locomotive fleet. The ALCO DL560C was chosen for the job due to its easy maintenance, reliability and simple operation.
The locomotive was classified as WDM 2 series and was relegated to hauling long/short distance passenger trains and freight. These units are still in service.
After importing couple of batches of this locomotive, Indian Railways started manufacturing them in India itself and also introduced modified variants of the same locomotive. Some were fitted with a less-powerful engine, classified as WDS series, and were meant for shunting duties in marshalling yards across the country.
Other variants were WDP series (for passenger traffic only) and WDG series for freight. But these variants had performance/maintenance-related issues and weren't considered as good as the original DL560C or WDM 2.