Indian locomotive class WDM-3A

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Indian WDM - 3A
Type and origin
Power typeDiesel
BuilderAlco, DLW
ModelALCO-251C
Build dateAugust 22, 1994 onwards
Total producedWDM-3A : 1296 as of December 2015
WDM-3D : 510 as of December 2015
WDG-3A : 1145 as of December 2015
Specifications
Configuration:
​
 • UICCo-Co
Gauge1,676 mm (5 ft 6 in)
BogiesALCO Asymmetric cast frame trimount
Wheel diameter1,092 mm (3 ft 7 in)
Wheelbase12.834 m (42 ft 1+1⁄4 in)
Length17.12 m (56 ft 2 in)
Width2.864 m (9 ft 4+3⁄4 in)
Height4.185 m (13 ft 8+3⁄4 in)
Axle load18,800 kg (41,400 lb)
Loco weight123,000 kg (271,000 lb)
Fuel typeDiesel
Fuel capacity5,000 L (1,100 imp gal; 1,300 US gal)
Prime moverALCO 251-C
RPM range400 - 1050 rpm
Engine typeV16 Diesel engine
AspirationABB VTC304-15 or Napier NA 295 IR turbocharger
Traction motorsBHEL TA 10102 CW (new), BHEL TG 10931 AZ(old)
Cylinders16
Cylinder size228 mm × 266 mm (8.98 in × 10.47 in)
bore x stroke
TransmissionDiesel electric
MU working2
Train brakesAir, Vacuum and Dual
Performance figures
Maximum speed120 km/h (75 mph)
Power outputMax:3,300 hp (2,500 kW)
Site rated:2,900 hp (2,200 kW)
Tractive effort30.45 t (30 long tons; 34 short tons)
Factor of adh.0.27
Career
OperatorsIndian Railways
Numbers14001-14079, 14080-14143
NicknamesCheetah, Prabal, Velociti, Awadh, Firex, Sher Punjab, Veer
LocaleAll over Indian Railways
Preserved1
Dispositionactive

The class WDM-3A is Indian Railways' workhorse diesel locomotive. Since 1994, it has been manufactured in India by the Diesel Locomotive Works (DLW), Varanasi. The model name stands for broad gauge (W), diesel (D), mixed traffic (M) engine. The WDM-3A is the most common diesel locomotive of Indian Railways. The WDM-3A is a variant of the original WDM-2C. These units have been retro-fitted with dual brakes, in addition to the air and vacuum brakes. The WDM-3A locos have a maximum speed of 120 km/h (75 mph). The gear ratio is 65:18.[1]

The loco is now widely used across India for long distance passenger trains due to its ruggedness and high tractive loads and acceleration.

History

A WDM-3A hauling a passenger train at Bolpur - Shantiniketan station.

The first one was delivered on August 22, 1994, It was then WDM-2C. Over 150+ locos were produced till 1998.

Some of the sheds that hold WDM 3A

  1. Andal(UDL)
  2. Abu Road(ABR)
  3. Bardhaman(BWN)
  4. Bokaro Steel City(BKSC)
  5. Bondamunda(BNDM)
  6. Ernakulam(ERS)
  7. Erode(ED)
  8. Gonda(GD)
  9. Gooty(GY)
  10. Guntakal(GTL)
  11. Guwahati(NGC)
  12. Howrah(HWH)
  13. Itarsi(ET)
  14. Jamalpur(JMP)
  15. Jhansi(JHS)
  16. Kalyan(KYN)
  17. Katni(KTE)
  18. Kazipet(KZY)
  19. Kharagpur(KGP)
  20. Krishnarajapuram(KJM)
  21. Lucknow(LKO)
  22. Ludhiana(LDH)
  23. Malda Town(MLDT)
  24. Moula Ali(MLY)
  25. Mughalsarai(MGS)
  26. Golden Rock(GOC)
  27. Pune(PUNE)
  28. Patratu(PTRU)
  29. Raipur(RAIPUR)
  30. Ratlam(RTM)
  31. Samastipur(SMP)
  32. Tughlakabad(TKD)
  33. Vatva(VTA)
  34. Tondiarpet(TNP)
  35. Visakhapatnam(VSKP)

[2]

Technical specifications[3]

Manufacturers Alco, DLW
Engine Alco 251-C, 16 cylinder, 3,300 hp (2,500 kW) (2,430 hp or 1,810 kW site rating) with Alco 710/720/?? turbo supercharged engine. 1,050 rpm max, 400 rpm idle; 228 mm × 266 mm (8.98 in × 10.47 in) bore x stroke; compression ratio 12.5:1. Direct fuel injection, centrifugal pump cooling system (2,457 L/min (540 imp gal/min; 649 US gal/min) at 1,000 rpm), fan driven by eddy current clutch (86 hp or 64 kW at 1,000 rpm)
Governor GE 17MG8 / Woodwards 8574-650
Transmission Electric, with BHEL TA 10102 CW alternator (1,050 rpm, 1130 V, 4,400 amperes) (Earlier used BHEL TG 10931 AZ alternator)
Traction motors GE752 (original Alco models) (405 hp or 302 kW), BHEL 4906 BZ (AZ?) (435 hp or 324 kW) and (newer) 4907 AZ (with roller bearings)
Axle load 18.8 tonnes (18.5 long tons; 20.7 short tons), total weight 112.8 t (111.0 long tons; 124.3 short tons)
Bogies Alco design cast frame trimount (Co-Co) bogies
Starting TE 30.45 t (29.97 long tons; 33.57 short tons), at adhesion 27%
Length over buffer beams 15,862 mm (52 ft 1⁄2 in)
Distance between bogies 10,516 mm (34 ft 6 in)
WDM 3D powerhouse of the Dehradun Shatabdi Express

See also

References

  1. ^ "About WDM-3A".
  2. ^ http://www.irfca.org/faq/faq-shed.html
  3. ^ Indian diesel loco information
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