The class WDM-4 is the fourth class of India’s wide-gauge (W) diesel-fueled (D) and mixed-load (M) series capable of hauling both freight and passenger trains. Despite the classification it was never seen hauling freight trains. It is not known as to why IR decided to allot 4th class instead of 3rd as there was no WDM-3 at the time. This was India’s first EMD locomotive designated as GT16. These were the fastest locomotives in India till the arrival of WAP-3.
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