The EMDGT-50AC or WDG-5 a class of heavy haul Diesel-electric locomotive built by Diesel Locomotive Works, Varanasi in collaboration with Electro-Motive Diesel. At a rated power output of 5,500 horsepower (4,100 kW), it is the second most powerful diesel locomotive class in Indian Railways, out-powered just by the 6,000 horsepower (4,500 kW) WDG-6G. Derived from the SD-80MAC, it was meant as a direct upgrade to the WDG-4 (SD-70MAC derivative).