The GE ES43ACmi, classified as WDG-4G by the Indian Railways (IR), is a class of dual-cabin freight-hauling diesel-electric locomotive. The locomotive is designed by GE Transportation and is based on its Evolution Series, which are used in North America. The class is meant for freight hauling and replaces the older American Locomotive Company(ALCO)-designed locomotives, which have been the mainstay diesels of Indian Railwayssince 1962. Equipped with a 12-cylinder fully turbocharged GEVO engine, it is claimed to be 50% more environmentally friendly than its predecessors and is the first in the country to be compliant with level one of the emission norms set by the International Union of Railways (UIC-1). The locomotive has two cabs for easy reversal, both of which are air conditioned. Type and originPower typeDieselBuilderDiesel Locomotive Factory, MarhowrahModelGE ES43ACmiBuild dateAugust 2017Total produced296 as of April 2021 SpecificationsConfiguration: • UICCo-CoGauge1,676 mm(5 ft 6 in)Broad GaugeWheel diameter43" (1092 mm)Axle load22,000 kg (49,000 lb)Loco weight132,000 kg (291,000 lb)Fuel typeDieselFuel capacity6,300 L (1,400 imp gal; 1,700 US gal)Prime moverGE GEVO-12 Tier 1Engine typeV12 Diesel engine, 4-stroke engineAspirationturbochargedTraction motors6Cylinders12TransmissionDiesel electricMU workingYesTrain brakesAir, Dynamic BrakePerformance figuresMaximum speed100 km/h (62 mph)Power output4,500 hp (3,400 kW)Tractive effortStarting: 544 kN (122,296 lbf) Continuous: 405 kNCareerOperatorsIndian RailwaysNumbers49001+LocaleRoza (Uttar Pradesh), Gandhidham(Gujarat)Delivered12 October 2017DispositionActive The locomotive is part of a 13-year contract between Indian Railways and GE Transportation under which 700 such locomotives will be produced indigenously. Diesel Locomotive Factory, Marhowrah was set up by GE for the production and supply of these locomotives which is also seen as a boost to the Make in India initiative. The maintenance of the locomotive will be GE's responsibility which will also have to ensure that 95% of the fleet is ready at all times. For this, real time remote tracking and fault diagnostics has been implemented in the locomotive.