Indian locomotive class WDG-2/3A explained

WDG-3A
Powertype:Diesel
Builder:BLW, Diesel Loco Modernisation Works
Buildmodel:ALCO-251C/ALCO DL560C variant
Builddate:1994-2015
Totalproduction:WDG-3A: 1,998
Rebuilder:Diesel Loco Modernisation Works, Patiala
Uicclass:Co-Co
Bogies:High adhesion Fabricated bogies
Wheeldiameter:1092mm
Wheelbase:12.834abbr=onNaNabbr=on
Length:17.85abbr=onNaNabbr=on
Width:3.016abbr=onNaNabbr=on
Height:4.162abbr=onNaNabbr=on
Axleload:23500kg (51,800lb)
Locoweight:127t
Fueltype:Diesel
Fuelcap:6000L
Primemover:ALCO 251-C
Rpmrange:400 - 1,050 rpm
Enginetype:V16 Diesel engine
Aspiration:ABB VTC304-15 or Napier NA 295 IR turbocharger
Tractionmotors:BHEL TA 10102 CW (new), BHEL TG 10931 AZ(old)
Cylindercount:16
Cylindersize:228x
bore x stroke
Transmission:Diesel electric
Multipleworking:2
Maxspeed:105km/h
Poweroutput:WDG-3A: 3,100 hp
Tractiveeffort:37.9t
Factorofadhesion:0.33
Locobrakes:air dynamic brake
Trainbrakes:Air, Vacuum and Dual
Operator:Indian Railways
Fleetnumbers:14501-14999, Newer 13000-13665
Nicknames:Shakti, Prabal, Jai Jawan
Locale:throughout Indian Railways
Firstrundate:1994
Retiredate:Early 2020s-present
Preservedunits:1
Disposition:In service

The Indian locomotive class WDG-3A is a class of diesel-electric locomotive that was developed in 1994 by Banaras Locomotive Works (BLW),Varanasi for Indian Railways. The model name stands for broad-gauge (W), Diesel (D), Goods traffic (G) engine, 3,100 hp (3A) locomotive. They entered service on 18 July 1995. A total of 1,164 WDG-3A units were built between 1994 and 2015 at BLW, Varanasi with a few units being produced by Diesel Loco Modernisation Works (DLMW) and Parel Workshop.

It is the dedicated freight version of the very successful WDM-2 and shares the same engine and horsepower rating with WDM-3A. It is considered to be a successful locomotive class with high reliability and few maintenance problems. Despite the introduction of more modern types of locomotives like WDG-4 and electrification, a significant number are still in use, both in mainline and departmental duties.

As of September 2023, 787 locomotives still retain "operational status" on the mainline as WDG-3A, with a few examples having been converted to WAGC-3 or WAG-10.

History

The first units of this class was delivered on July 18, 1995, under the name of WDG-2.[1] The class was manufactured till end of 2015. All the older locomotives built by DLW had regular WDM-2 type square short hood profile and control stand position and the locomotives are rated at 3,100 HP.

From 2009 onward, they are equipped with Daulat Ram DBR, microprocessor control and an Auxiliary Power Unit (APU) in the short hood thus they bear external resemblance to the WDM-3D class.[2] [3] The WDG3A has higher Tractive Effort (7.5 t more) and Axle Load (1.7 t) compared to the WDM3A despite having the same engine and horsepower rating. Many units of this class has been named "Shakti" and can easily be recognized by their orange livery with cream stripe & lightning bolts. Besides IR, WDG-3A are being use by private companies for industrial uses, thermal power plants, port trusts, etc.

Production was stopped in 2015 when advanced locomotives like the WDG-4D were built, thus rendering the ALCO platform obsolete. Two WDG-4s can haul more goods than three WDG-3A combined. Meanwhile, Diesel Loco Works in Varanasi rebuilt few of the existing locomotives that had reached midlife into a purely electric twin section 10,000 hp (7,457 kW) locomotive, classifying them as the WAGC3.

The retirement of this class has begun due to electrification.

Sub Classes

WDG-3B

They were an experimental technical variant of the WDG3A with an upgraded ALCO engine to output 3,200 hp. But the experiment was unsuccessful and all units were reverted to normal WDG-3A. One of the locomotives of this class was numbered #14796.[4]

WDG-3C

Another experimental class, but this time rated at 3300 hp. Only one unit (#14962) was produced and was painted in a unique "Dark Rose/Cheetah" livery.[5] [6] This loco was derated to 2,600 hp, but is still with the Katni diesel locomotive shed. This class was unsuccessful as well.

WDG-3D

Freight version of the WDM-3D. Only one (#13301) unit was marked with this marking. It may possibly be rated at 3400 hp.[7] [8] Now it has been derated to 2600 hp with WDG-3A class markings and homed at the Vatva Loco Shed.

Locomotive sheds

Zone Name Shed Code Quantity
Central RailwayPunePA 20
KYN (D) 16
CLA 31
UDL 13
JMP 40
DDU (D) 4
SPJ 22
VSKP (D) 43
LDH (D) 48
LKO 25
TKD (D) 10
JHS (D) 25
IZN 1
MLDT 19
NGC 51
ABR 9
Southern RailwayERS 9
GOC 14
TNP 14
GTL (D) 16
BZA (D) 11
MLY31
BNDM (D) 29
MIB 34
KJM 21
RTM 35
SBI 28
NKJ (D) 14
Total Locomotives Active as of August 2024[9] 633

Rebuilding into WAGC-3

See main article: Indian locomotive class WAGC3/WAG-10. In 2018, Chittaranjan Locomotive Works, Banaras Locomotive Works and Research Design and Standards Organisation converted a WDG-3A into a purely electric, twin-section 10,000 hp (7,457 kW) locomotive, classified as the WAGC3.[10] This locomotive was the result of the initiative taken up by the Railway Board in November 2017, asking RDSO to work out details of conversion of diesel locos to electric locos. RDSO had suggested that such conversion would be possible with retaining the Motorized Truck assembly (which includes traction motors and drive side traction converters), computer controlled brakes (CCBs) and other relevant parts, suitably redesigning the under-frame and superstructure and adding the conversion kit. It was completed in only 69 days.[11] [12] Both units will together be considered as one asset and one locomotive by Indian Railways. Only a single unit has been produced so far and it is in service. It has been given to Bondamumda Shed of SER.

Technical specifications

Technical details are as follows:[13] [14]

ManufacturersDLW
EngineAlco 251-C, 16 cylinder, 3100abbr=onNaNabbr=on, (3007abbr=onNaNabbr=on site rating, earlier 2900abbr=onNaNabbr=on) with Napier NA2951R/ ABB VTC-304-VG15/ GE 7s 1716 turbo supercharged engine. 1,050 rpm max, 400 rpm idle; 228.6x bore x stroke; compression ratio 12.5:1. Direct fuel injection, centrifugal pump cooling system (2457L/min at 1,050 rpm), fan driven by eddy current clutch (90abbr=onNaNabbr=on at 1,050 rpm)
GovernorEDC / Woodward 8574-650
TransmissionElectric, with BHEL TA 10102 CW alternator (1,050 rpm, 1,100 V, 4,400 amperes) (Earlier used BHEL TG 10931 AZ alternator)
Traction motorsBHEL TM 4906 AZ/ 4907 BZ (435hp) (with roller bearings)
Axle load, total weight 112.8t
BogiesAlco High Adhesion Fabricated Bogies
Starting TE40t at adhesion 30.8%, continuous 37.05t
Length over buffer beams17850abbr=onNaNabbr=on
Distance between bogies11500abbr=onNaNabbr=on

See also

Notes and References

  1. Web site: Indian Railways Fan Club. IR History: Part - V (1970-1995). August 22, 2017.
  2. Web site: Indian Railways . Company Profile . indianrailways.gov.in . March 2, 2018.
  3. Web site: RDSO . Motive Power . 2018 . indianrailways.gov.in . March 2, 2018.
  4. Web site: Diesel Locomotive Roster – The WDP and WDG Series!. Theevandi. 2014-01-06. 24 Coaches. en-US. 2019-06-29.
  5. Web site: wdg3_cheetah.jpg. www.irfca.org. 2019-06-29.
  6. Web site: agf_trip2.jpg. www.irfca.org. 2019-06-29.
  7. Web site: WDG-3D #13301.
  8. Web site: [IRFCA] Indian Railways Locomotive Roster Vatva (VTA) WDG-3A 13301 Show]. www.irfca.org. 2019-06-29.
  9. Web site: Railway Website Mechanical Department. 16 May 2020.
  10. News: Indian Railways creates history! Converts diesel loco to 'Make in India' electric locomotive; watch video. 2018-03-03. The Financial Express. 2018-10-01. en-US.
  11. Web site: DLW/Varanasi converts WAGC3-class Diesel Locomotive from Diesel to Electric Traction – RailNews Media India Ltd. en-US. 2019-06-29.
  12. Web site: Diesel Locomotive Works (DLW): Indian Railways creates history by converting diesel locomotive into electric India. March 3, 2018. Binay . Singh . The Times of India. en. 2019-06-29.
  13. Web site: Diesel Locomotive Classes – Broad Gauge. Indian Railways Fan Club.
  14. Web site: WDG3A - 3100 HP Goods Locomotive . 22 June 2019 . 15 December 2017 . https://web.archive.org/web/20171215084409/http://www.dlw.indianrailways.gov.in/works/uploads/File/WDG3A.pdf . dead .