| WDG-4 | |
| Powertype: | Diesel-electric |
| Builder: | EMD BLW |
| Buildmodel: | GT46MAC (1997-2007) GT46ACe (2007-2016) JT46ACe (2013-2018) |
| Builddate: | (EMD) 1997–1998 (BLW) 2002–2018 |
| Totalproduction: | WDG-4: 1188 WDG-4D: 583 (Mainline Production has stopped, but happens occasionally for Non-Railway Customers) |
| Britishclass: | Co-Co |
| Uicclass: | Co′Co′ |
| Trucks: | HTSC |
| Length: | 21.26m (69.75feet) |
| Height: | 4.11m (13.48feet) |
| Locoweight: | 126000kg (278,000lb) or 126t |
| Axleload: | 21000kg (46,000lb) |
| Fueltype: | Diesel fuel |
| Fuelcap: | 6,100 Litres |
| Primemover: | EMD 16-710G3B |
| Enginetype: | two-stroke V16 diesel |
| Displacement: | 186.2abbr=offNaNabbr=off |
| Aspiration: | turbocharged |
| Alternator: | TA-17-CA6A AC |
| Cylindercount: | 16 |
| Transmission: | diesel electric |
| Tractionmotors: | 1 inverter per truck, AC traction motors |
| Maxspeed: | 105km/h |
| Poweroutput: | 4000-1NaN-1 / 4500-1NaN-1 |
| Tractiveeffort: | 540kN |
| Fleetnumbers: | WDG-4 :- 12001 - 12999 & 70001 - 70190 WDG-4D :- 12681 & 70301 - 70882 |
| Operator: | Indian Railways, Sri Lanka Railways [as locomotive class [[Locomotives of Sri Lanka Railways#Class M — Diesel Electric Locomotives|M-11]], Down-tweaked to 3,250 HP (2.4 MW) using a v12-710 prime mover] |
| Locobrakes: | Air |
| Trainbrakes: | Graduated Release Twin Pipe Air Brake, Dynamic Brakes, Blended |
The Indian locomotive class WDG-4 (EMD GT46MAC) is a type of six-axle (Co-Co) freight-hauling diesel-electric locomotive with AC electric transmission designed by General Motors Electro-Motive Diesel[1] in 1997–1998 for Indian Railways, where they are classed as WDG-4. Derived from the EMD SD70MAC, it is powered by a 4000abbr=onNaNabbr=on 16-cylinder EMD 710G3B prime mover. Thirteen were built by EMD as order #958647, and a further eight were exported in kit form and assembled in India. The class entered service in 1999. A Dedicated Passenger version of this locomotive, the WDP-4 (EMD GT46PAC), has also been produced, with a Bo1-1Bo Wheel Configuration, which entered service in 2001. These locomotives are also famous for, and can be identified, by the distinct and unique Jet Plane-like sounding capability of the EMD 710 prime mover.
Further construction has been under license in India by the Banaras Locomotive Works (BLW), with the first purely indigenously built WDG-4 locomotive, numbered 12022, that rolled out in 2002. More than 60 additional locomotives have been built . They are numbered from #12001 upward.
, EMD and DLW have begun building GT46ACe's using IGBT technology to replace the older gate turn-off thyristor technology and along with increase of 500 hp, ie, 4500hp, using the Newly tweaked EMD 16N-710G3B-EC, like the passenger WDP-4B have been produced. Newer versions with widened Piggy-face cab profile for enhanced visibility, just like the later variants of WDP-4's and WDP-4B's were also produced., DLW began building the Dual Cab version, EMD JT46ACe, called WDG-4D, based on the passenger variant WDP-4D locos, same for both-side visibility. Here again, many features, including IGBT and 4,500 hp have been carried on from the single cab GT46ACe's. The first WDG-4D, numbered 12681, is named "Vijay". Later WDG-4D's were numbered from 70301, as the 12*** series came to an end in 2014 and got switched to 70*** series. Over 1,500 such locomotives, including both WDG-4's and WDG-4D's are currently in operation.
Indian Railways has also developed the WDG-4 series into EMD GT50AC (aka WDG-5), using a v20-710G prime mover, based on the SD80MAC, rated at 5,500 HP (4,130 kW). However, this locomotive has turned out to be a Failure, due to various reasons.
Since the year 2017, BLW (DLW then) began manufacturing such locomotives for Non-Railway Customers. The first such locomotive, which would be a Dual-Cab WDG-4D, rolled out to serve Odisha Power Generation Corporation (OPGC), in March 2017. 3 WDG-4D locomotives currently serve OPGC. As of 2024, 2 new Single-Cab Piggy-face WDG-4 locomotives have been manufactured and rolled out for Obra Thermal Power Station, based at Sonbhadra, Uttar Pradesh.
| Zone | Name | Shed Code | Quantity | ||
|---|---|---|---|---|---|
| WDG-4/4D | |||||
| Pune | PA | 90 | |||
| KYN(D) | 64 | ||||
| Eastern Railway | UDL | 133 | |||
| PTRU | 79 | ||||
| VSKP(D) | 121 | ||||
| LDH(D) | 26 | ||||
| LKO | 68 | ||||
| TKD (D) | 39 | ||||
| IZN | 2 | ||||
| North Central Railway | JHS (D) | 20 | |||
| NGC | 39 | ||||
| SGUJ | 154 | ||||
| BGKT | 48 | ||||
| ABR | 107 | ||||
| GOC | 75 | ||||
| ERS | 34 | ||||
| TNP | 2 | ||||
| KZJ(D) | 75 | ||||
| GY | 14 | ||||
| BZA(D) | 45 | ||||
| MLY | 19 | ||||
| BNDM(D) | 119 | ||||
| R | 98 | ||||
| KJM | 26 | ||||
| UBL | 171 | ||||
| Sabarmati | SBT | 28 | |||
| ET(D) | 53 | ||||
| Total Locomotives Active as of August 2024[2] | 1749 | ||||
| Name of the Operator | Quantity | |
|---|---|---|
| WDG-4/4D | ||
| Odisha Power Generation Corporation | 3 | |
| Obra Thermal Power Station | 2 | |