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WDM locomotives are known as the workhorse of Indian Railways. Basically it is a diesel-electric locomotive and is based on the original ALCOs (American Locomotive Company) design and technology. These locomotives are also known to be most reliable for hauling both passenger trains & heavy freight cars. 3300HP WDM 3A is an upgrade to its to sibling WDM 2 diesel locomotives with a maximum speed limit of 120kmph and of Indian Railways with many advance feature.