Indian locomotive class WDG-4G

WDG-4G
Roza based WDG-4G roaming at Katihar Jn.
Type and origin Power type Diesel Designer GE Transportation India, Bengaluru Builder GE Transportation, Erie, Pennsylvania, Diesel Locomotive Factory, Marhowrah Model ES43ACmi Build date 3 August 2017 - present Total produced 516 as of November 2024
Specifications Configuration: ​  • Commonwealth Co-Co Gauge 1,676 mm (5 ft 6 in) Broad Gauge Bogies Co-Co Fabricated Bogie Wheel diameter New: 1,092 mm (43.0 in) Condemned: 1,016 mm (40.0 in) Minimum curve 174 m (571 ft) radius Wheelbase 1,900 mm (6.2 ft) (adjacent) Pivot centres 14,478 mm (14.478 m) Length: ​  • Over couplers 22,567 mm (22.567 m) Width 3,200 mm (3.2 m) Height 4,227 mm (4.227 m) Axle load 22 t (22,000 kg) Loco weight 132,000 kg (132 t) Fuel type Diesel Fuel capacity 6,300 L (1,400 imp gal; 1,700 US gal) Lubricant cap. 1,030 L (230 imp gal; 270 US gal) Coolant cap. 1,249 L (275 imp gal; 330 US gal) Sandbox cap. 170 L (37 imp gal; 45 US gal) Prime mover GE GEVO-12 RPM: ​  • Maximum RPM 1050 rpm Engine type V12 Diesel engine, 4-stroke engine Aspiration turbocharged Displacement 15.7L per cylinder Alternator 5GDY100C Traction motors 5GEB24 AC traction motors Cylinders 12 Cylinder size 250 mm × 320 mm (9.8 in × 12.6 in) Transmission Diesel–electric Gear ratio 85:18 MU working Yes, AAR Type Loco brake Air, Dynamic Brake Train brakes Air Compressor 178 CFM @ 145 psig Couplers CBC AAR Type-E
Performance figures Maximum speed 100 km/h (62 mph) Power output 4,500 hp (3,400 kW) Tractive effort: ​  • Starting 544 kN (122,000 lbf)  • Continuous 405 kN (91,000 lbf) Brakeforce 220 kN (49,000 lbf)
Career Operators Indian Railways Numbers 49001+ Locale Roza (Uttar Pradesh), Gandhidham (Gujarat), Gooty (Andhra Pradesh) Delivered 12 October 2017 Disposition Active

The Indian locomotive class WDG-4G (GE ES43ACmi)^[1] is a class of dual-cabin freight-hauling diesel–electric locomotive used by the Indian Railways (IR). 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 Railways since 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.

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.