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EMD GT46MAC(4000hp)/GT46ACe(4500hp)
WDG4 numbered 12029 of Hubli diesel locomotive shed.
Type and origin
Power type Diesel-electric
Builder EMD
Model GT46MAC
Build date (EMD) 1997–1998
(DLW) 2002–2017
Total produced (EMD) 12 complete, 8 kit form
(DLW) 8 kit assembled, 1420 under license (still in production)
 • AAR C-C
 • UIC Co-Co, Co'Co'
Gauge 5 ft 6 in (1,676 mm)
Trucks HTSC
Length 69 ft 9 in (21.26 m)
Height 13 ft 6 in (4.11 m)
Axle load 48,500 lb (22,000 kg)
Loco weight 277,800 lb (126,000 kg)
or 138.9 short tons (124.0 long tons; 126.0 t)
Fuel type Diesel fuel
Fuel capacity 1,600 US gal (1,300 imp gal; 6,100 L)
Prime mover 16-710G3B
Engine type two-stroke V16 diesel
Aspiration turbocharged
Displacement 11,360 cubic inches (186.2 liters)
Alternator TA-17-CA6A AC
Traction motors 1 inverter per truck, AC traction motors
Cylinders 16
Transmission diesel electric
Loco brake Air
Train brakes Air
Performance figures
Maximum speed 75 mph (121 km/h)
Power output 4,000 hp (2,980 kW) / 4,500 hp (3,360 kW)
Tractive effort 121,400 lbf (540 kN)
Gooty (GY) based WDG 4 locos
Siliguri (SGUJ) based WDG 4 locos

The EMD GT46MAC is a freight-hauling diesel-electric locomotive with AC electric transmission built by General Motors Electro-Motive Division[1] in 1997–1998 for Indian Railways, where they are classed as WDG 4.[2] Thirteen were built by EMD as order #958647, and a further eight were exported in kit form and were assembled in India. The class entered service in 1999.[3]

Further construction has been under license in India by the Diesel Locomotive Works (DLW); more than 60 additional locomotives have been built as of 2006.[2] They are numbered from #12001 upward. A similar type, the EMD GT46PAC, has also been produced for passenger service in India.

As of 2007, EMD and DLW have begun building GT46Ace's using IGBT technology to replace the older gate turn-off thyristor technology. Newer editions with 4,500 hp (3,400 kW) have been produced. Over 1,000 WDG-4 locomotives are currently in operation.


WDG-4 first started operations in 1999 with the numbering starting from 12001 (this loco can still be seen in a splendid condition and is homed at the parent shed of Hubli) Hubli Diesel Locomotive Shed has been operational since 1999, and it houses the maximum number of WDG-4s from 12001-12064, 12067-12153, 12156, 12169, 12189, 12227, 12276, 12311–12313, 12325, 12326. The original WDG-4s from 12001–12021 were imported and later on DLW started manufacturing it indigenously. With six traction motors, this locomotive has the capability of touching 105 km/h (65 mph) with a fully loaded freight train of 58 wagons. The locomotive has been praised for its ability to work smoothly in regions with massive gradients, especially in the (Braganza Ghats) and the Subrahmanya ghats having a gradient of 1:37 and 1:50 respectively.

See also[edit]


  1. ^ "GM EMD: GT46MAC". Archived from the original on 2004-03-03. Retrieved 2006-11-19.
  2. ^ a b "[IRFCA] Indian Railways FAQ: Diesel Locomotive Classes – Broad Gauge". Retrieved 2006-11-19.
  3. ^ "[IRFCA] Indian Railways FAQ: IR History, Part 6". Retrieved 2006-11-19.

External links[edit]