Indian locomotive class WDP-4

The Indian locomotive class WDP-4 (EMD GT46PAC) is a passenger-hauling diesel-electric locomotive with AC electric transmission designed by General Motors Electro-Motive Division and built by both GM-EMD and under license by Banaras Locomotive Works (BLW) of Varanasi, India for Indian Railways as the classes WDP4, WDP4B and WDP4D. The GT46PAC is a passenger version of the previous Indian Railways EMD GT46MAC freight locomotive. The locomotive has a 16-cylinder 710G3B diesel engine and is one of the fastest diesel-electric locomotives in service in Indian Railways.

WDP-4
Tughlakabad DLS based WDP-4D #40109.
Type and origin
Power typeDiesel-electric
BuilderEMD & BLW
ModelGT46PAC (2000-2007)
GT46PACe (2007-2012)
JT46PACe (2010-2017)
Build date(EMD) 2000-2001
(DLW) 2003-2017
Total producedWDP-4: 100
WDP-4B: 86
WDP-4D: 525 (Production has stopped)
Specifications
Configuration:
​
 • UICCo′Co′
 • CommonwealthCo-Co
Gauge5 ft 6 in (1,676 mm)
Truckshigh adhesion HTSC (High Tensile Steel Cast)
Wheel diameter1,092 mm (43.0 in)
Axle loadWDP-4 : 19.5 t (19.2 long tons; 21.5 short tons)
WDP4B : 20.2 t (19.9 long tons; 22.3 short tons)
WDP4D : 20.5 t (20.2 long tons; 22.6 short tons)
Loco weightWDP4 : 115.8 t (114.0 long tons; 127.6 short tons)
WDP4B : 117 t (115 long tons; 129 short tons)
WDP4D : 123 t (121 long tons; 136 short tons)
Fuel typeDiesel fuel
Fuel capacity5,000–6,100 L (1,100–1,300 imp gal; 1,300–1,600 US gal)
Prime moverEMD 16-710G3B
RPM range200 - 954 rpm ​
 • RPM low idle200 rpm
 • RPM idle269 rpm
 • Maximum RPM954 rpm
Engine type2-stroke V16 diesel
Aspirationturbocharged
Displacement186.16 L (11,360 cu in)
AlternatorWDP4 / WDP4B : GM TA-17 (main) with CA-6B (companion)
WDP4D : EMD TA-17 (main) with C6AB (companion) or BHEL TA 9901 (main) with AA 9201 (companion)
Traction motorsWDP4 : Siemens 1TB2622-0TB02
WDP4B : Siemens 1TB2622-0TA02 or EMD A 2916-8
WDP4D : Siemens 1TB2525-0TA02 or EMD A 2916-8 ​
 • Continuous1250 Amps DC
Cylinders16
TransmissionAC Electric
Gear ratio17:77
Loco brakeAir, Handbrake, Blended (not in WDP4), Dynamic brake
Train brakesGraduated Release Twin Pipe Air Brakes (IRAB-1 Compatible)
Performance figures
Maximum speedWDP-4 :
Service : 160 km/h (99 mph)
Testing : 180 km/h (110 mph)

WDP-4B : 130 km/h (81 mph)

WDP-4D : 135 km/h (84 mph)
Power output
  • 4,000 hp (2,980 kW) (WDP4)
  • 4,500 hp (3,360 kW) (WDP4B)
  • 4,500 hp (3,360 kW) (WDP4D)
Tractive effortWDP-4 : 27,550 kgf (270.2 kN)

WDP-4B : 40,775 kgf (399.87 kN)

WDP-4D : 43,788 kgf (429.41 kN)
Career
OperatorsIndian Railways
Numbers20000 - 20103, 40001 - 40608
LocaleIndia
Unless specified otherwise, data is obtained from RDSO diagram books, given in references.
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