The Indian locomotive class WDM-3A is a class of diesel–electric locomotive that was developed in 1993 by Banaras Locomotive Works (BLW), Varanasi for Indian Railways. The model name stands for broad gauge (W), Diesel (D), Mixed traffic (M) engine, with 3300 horsepower (3A). The WDM-3A is a later classification of earlier WDM-2C. They entered service in 1994. A total of 143+ were built at ALCO and Banaras Locomotive Works between 1994 and 2003 with rest of the 1246 units being rebuilt from WDM-2 which made them the most numerous class of mainline diesel locomotive until the WDG-4.
The WDM-3A is one of the most successful locomotives of Indian Railways serving both passenger and freight trains for over 26 years. A few WDM-3A units were exported to neighboring countries like Sri Lanka and Bangladesh. 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 April 2022, 769 locomotives still retain "operational status" on the mainline as WDM-3A, with further examples having been converted back to WDM-2 or WDM-2S. The loco is now widely used across India for long-distance passenger trains due to its ruggedness and high tractive loads and acceleration.
WDM-3A with Padatik ExpressA WDM-3A loco from Gooty Loco Shed hauling an Express trainBaldieWDM 3A in Ghaziabad Junction.
The first one was delivered on August 22, 1994, it was then WDM-2C.[1][2] First 57 units produced till March 1996 (Indian Railway road number 14001–14057) had rounded front hood profile similar to contemporary newer classes of locos built by DLW (WDG3A and WDP1).
After that there was a gap of long four years in the WDM-3A production line in BLW. 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.[3] These new locomotives had their control stand shifted to the left side of the cabin. Meanwhile, Diesel Loco Modernization Works (erstwhile Diesel Modification Works which again was known as Diesel Component Works) in Patiala started rebuilding the existing WDM-2 locomotives, which had reached midlife, with upgraded power-packs. DLMW Patiala re-calibrates the power-pack and upgrades the output power rating to 3100HP.[4] DLW again started building WDM-3A from the year 2000 and continued till the end of 2002 with locomotive road numbers in the range 14058–14143. All the locomotives rebuilt by DLMW and later batch from DLW had regular WDM-2 type square short hood profile and control stand position. DLW again built WDM-3A variant locomotives, during 2005–2006, in the road number range 14144-14167 which were classified as WDM-3B due to their difference in bogie design from classic ALCo asymmetrical trimount to HAHS design which was employed in WDG2 and later WDM-3D classes too. Most of the WDM-B were later converted to WDM-3D.
In 2011, DLMW rebuilt locomotive number 16502 as WDM-3A and equipped it with an Electronic Fuel Injection (EFI) system jointly developed by Engine Research Laboratory of IIT Kanpur, Engine Development Directorate of RDSO, and DLMW Patiala.[5] DLMW continues to rebuild WDM-2 as WDM-3A and recently they have started rebuilding the DLW built WDM-3A too when they reach their midlife. Recent rebuilt locomotives are rated at 3300 HP, and from 2009 onward they are equipped with Daulat Ram DBR, and since 2014 they are also equipped with an Auxiliary Power Unit (APU) in the short hood.[6] Some rebuilt locomotives have Co-Co-fabricated ATHS (Advanced Trimount High Speed) bogies instead of ALCo cast-iron type.[7] All the rebuilt WDM-3A bear the "-R" suffix to their road numbers.
In 2012 Bangladesh Railway ordered 26 WDM-3A from DLW. They are classified as Class 6500 there. These units, however, lack the dynamic braking which happens to be an essential component in their Indian counterparts.
Bangladeshi Counterpart of WDM-3A
Sub-classesedit
WDM-3Cedit
The WDM-3C were just upgraded and more powerful WDM-3As with the ALCO engine gain rebuilt to output 3300 hp. It was the first follow-up experiment after the WDM-3A to squeeze more power out of the ALCO engine, an intermediary that would later lead to the development of the WDM-3D. Not many were produced, all of which were rebuilds of the WDM-2 or WDM-3A and were identical to the previous variants in every aspect. They can no longer be found over the railway network as all of them have been rebuilt into the WDM-3A or WDM-2 type.[8]
Alco 251-C, 16 cylinder, 3,300 hp (2,500 kW), earlier 3,100 hp (2,300 kW) (3,007 hp or 2,242 kW site rating, earlier 2,900 hp (2,200 kW)) with Napier NA2951R/ ABB VTC-304-VG15/ GE 7s 1716 turbo supercharged engine. 1,050 rpm max, 400 rpm idle; 228.6 mm × 266.7 mm (9.00 in × 10.50 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 1,050 rpm), fan driven by eddy current clutch (90 hp or 67 kW at 1,050 rpm)
^. Indian Railways http://www.dmw.indianrailways.gov.in/works/uploads/File/Company%20Profile.pdf. Retrieved 2 March 2018. {{cite web}}: Missing or empty |title= (help)
^"Direction Article Development of EFI for 204-stroke locomotive diesel engine" (PDF). iitk.ac.in. Indian Railways. 2018. Retrieved 2 March 2018.
^"Company Profile" (PDF). indianrailways.gov.in. Indian Railways. Retrieved 2 March 2018.
^"Motive Power" (PDF). indianrailways.gov.in. RDSO. 2018. Retrieved 2 March 2018.
^"Diesel Loco Roaster WDM (ALCO) series". 30 October 2013.
^"Railway Website Mechanical Department". Retrieved 16 May 2020.
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This article is about the WDM 2 based locomotive series For the original Diesel hydraulic WDM 3 see Indian locomotive class WDM 3 The Indian locomotive class WDM 3A is a class of diesel electric locomotive that was developed in 1993 by Banaras Locomotive Works BLW Varanasi for Indian Railways The model name stands for broad gauge W Diesel D Mixed traffic M engine with 3300 horsepower 3A The WDM 3A is a later classification of earlier WDM 2C They entered service in 1994 A total of 143 were built at ALCO and Banaras Locomotive Works between 1994 and 2003 with rest of the 1246 units being rebuilt from WDM 2 which made them the most numerous class of mainline diesel locomotive until the WDG 4 WDM 3AErnakulam based WDM 3A twins at Turavur Type and originPower typeDiesel electricDesignerBLW RDSOBuilderBLW PLWModelAlco DL560CBuild date1994 2015Total producedWDM 3A 1402RebuilderPLWSpecificationsConfiguration UICCo Co CommonwealthCo CoGauge1 676 mm 5 ft 6 in BogiesAlCo Asymmetric Cast Steel Trimount Bogie Old Advance Trimount High Speed ATHS fabricated bogie New Wheel diameter1 092 mm 3 ft 7 0 in Wheelbase Axle spacing Asymmetrical 1 702 mm 5 ft 7 in 2 108 mm 6 ft 11 in Pivot centres10 516 mm 34 ft 6 in Length Over couplers17 132 mm 56 ft 2 1 2 in Over beams15 862 mm 52 ft 1 2 in Width2 900 mm 9 ft 6 1 8 in Height4 185 mm 13 ft 8 3 4 in Axle load18 8 t 18 5 long tons 20 7 short tons Loco weight112 8 t 111 0 long tons 124 3 short tons Fuel typeDieselFuel capacity5 000 L 1 100 imp gal 1 300 US gal Lubricant cap 1 270 L 280 imp gal 340 US gal Coolant cap 1 210 L 270 imp gal 320 US gal Sandbox cap 160 L 35 imp gal 42 US gal Prime moverAlco 251 B BLW Uprated RPM range400 1050 rpmEngine typeV16 Four stroke diesel engineAspirationABB VTC304 VG15 OR Napier NA 295IR OR GE 7S1716 Turbo superchargedDisplacement175 14 L 38 53 imp gal 46 27 US gal AlternatorBHEL TA10102CWGeneratorBHEL AG2702AZ Old BHEL AG3101AY 1 New Traction motorsBHEL TM4906AZ or BHEL TM4907BZ Rating 1 hour1060 amps Continuous1000 ampsCylinders16Cylinder size228 6 mm 266 7 mm 9 00 in 10 50 in bore x strokeTransmissionDiesel electric AC DC TransmissionGear ratio18 65MU working2Loco brakeAir Brake Dynamic Brake Hand BrakeTrain brakesAir BrakeCompressor2 266 L min 400 rpm 5 665 L min 1000 rpm Performance figuresMaximum speed120 km h 75 mph Power outputMax 3100 HP 3300 HP Rebuilt Site rated 2900 HP 3007 HPTractive effort30 45 tf 298 6 kN 27 adhesionFactor of adh 2 6Brakeforce22 tf 220 kN CareerOperatorsIndian Railways Bangladesh RailwayNumbers13xxx 14001 14057 14058 14143 16000 few in 18xxx series and 17xxx seriesNicknamesCheetah Prabal Velociti Awadh Firex Sher Punjab VeerPreserved1Dispositionactive The WDM 3A is one of the most successful locomotives of Indian Railways serving both passenger and freight trains for over 26 years A few WDM 3A units were exported to neighboring countries like Sri Lanka and Bangladesh 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 April 2022 769 locomotives still retain operational status on the mainline as WDM 3A with further examples having been converted back to WDM 2 or WDM 2S The loco is now widely used across India for long distance passenger trains due to its ruggedness and high tractive loads and acceleration Contents 1 History 2 Sub classes 2 1 WDM 3C 3 Locomotive sheds 4 Technical specifications 5 See also 6 ReferencesHistory edit nbsp WDM 3A with Padatik Express nbsp A WDM 3A loco from Gooty Loco Shed hauling an Express train nbsp Baldie nbsp WDM 3A in Ghaziabad Junction The first one was delivered on August 22 1994 it was then WDM 2C 1 2 First 57 units produced till March 1996 Indian Railway road number 14001 14057 had rounded front hood profile similar to contemporary newer classes of locos built by DLW WDG3A and WDP1 After that there was a gap of long four years in the WDM 3A production line in BLW 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 3 These new locomotives had their control stand shifted to the left side of the cabin Meanwhile Diesel Loco Modernization Works erstwhile Diesel Modification Works which again was known as Diesel Component Works in Patiala started rebuilding the existing WDM 2 locomotives which had reached midlife with upgraded power packs DLMW Patiala re calibrates the power pack and upgrades the output power rating to 3100HP 4 DLW again started building WDM 3A from the year 2000 and continued till the end of 2002 with locomotive road numbers in the range 14058 14143 All the locomotives rebuilt by DLMW and later batch from DLW had regular WDM 2 type square short hood profile and control stand position DLW again built WDM 3A variant locomotives during 2005 2006 in the road number range 14144 14167 which were classified as WDM 3B due to their difference in bogie design from classic ALCo asymmetrical trimount to HAHS design which was employed in WDG2 and later WDM 3D classes too Most of the WDM B were later converted to WDM 3D In 2011 DLMW rebuilt locomotive number 16502 as WDM 3A and equipped it with an Electronic Fuel Injection EFI system jointly developed by Engine Research Laboratory of IIT Kanpur Engine Development Directorate of RDSO and DLMW Patiala 5 DLMW continues to rebuild WDM 2 as WDM 3A and recently they have started rebuilding the DLW built WDM 3A too when they reach their midlife Recent rebuilt locomotives are rated at 3300 HP and from 2009 onward they are equipped with Daulat Ram DBR and since 2014 they are also equipped with an Auxiliary Power Unit APU in the short hood 6 Some rebuilt locomotives have Co Co fabricated ATHS Advanced Trimount High Speed bogies instead of ALCo cast iron type 7 All the rebuilt WDM 3A bear the R suffix to their road numbers In 2012 Bangladesh Railway ordered 26 WDM 3A from DLW They are classified as Class 6500 there These units however lack the dynamic braking which happens to be an essential component in their Indian counterparts nbsp Bangladeshi Counterpart of WDM 3ASub classes editWDM 3C edit The WDM 3C were just upgraded and more powerful WDM 3As with the ALCO engine gain rebuilt to output 3300 hp It was the first follow up experiment after the WDM 3A to squeeze more power out of the ALCO engine an intermediary that would later lead to the development of the WDM 3D Not many were produced all of which were rebuilds of the WDM 2 or WDM 3A and were identical to the previous variants in every aspect They can no longer be found over the railway network as all of them have been rebuilt into the WDM 3A or WDM 2 type 8 Locomotive sheds editZone Name Shed code Quantity Central Railway Pune PA 2 Kurla CLA 1 Eastern Railway Howrah HWH D 18 Jamalpur JMP 24 Northern Railway Tughlakabad TKD D 24 Ludhiana LDH D 68 Lucknow LKO 16 North Eastern Railway Izzatnagar IZN 19 Northeast Frontier Railway Malda Town MLDT 13 Guwahati NGC 11 North Western Railway Abu Road ABR 21 Southern Railway Ernakulam ERS 15 Golden Rock GOC 2 Tondiarpet TNP 17 South Central Railway Guntakal GTL D 10 Moula Ali MLY 22 South Eastern Railway Bondamunda BNDM D 20 South East Central Railway Raipur R 5 South Western Railway Krishnarajapuram KJM 17 West Central Railway Itarsi ET D 11 New Katni Junction NKJ D 1 Total locomotives active as of May 2024 9 10 340Technical specifications editTechnical details are as follows 11 12 Manufacturers DLW DLMW DMW DCW Engine Alco 251 C 16 cylinder 3 300 hp 2 500 kW earlier 3 100 hp 2 300 kW 3 007 hp or 2 242 kW site rating earlier 2 900 hp 2 200 kW with Napier NA2951R ABB VTC 304 VG15 GE 7s 1716 turbo supercharged engine 1 050 rpm max 400 rpm idle 228 6 mm 266 7 mm 9 00 in 10 50 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 1 050 rpm fan driven by eddy current clutch 90 hp or 67 kW at 1 050 rpm Governor EDC Woodward 8574 650 Transmission Electric with BHEL TA 10102 CW alternator 1 050 rpm 1100 V 4 400 amperes Earlier used BHEL TG 10931 AZ alternator Traction motors BHEL TM 4906 AZ 4907 BZ 435 hp or 324 kW 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 asymmetric trimount Co Co bogies Starting TE 30 45 t 29 97 long tons 33 57 short tons at adhesion 27 continuous 28 05 t 27 61 long tons 30 92 short tons Length over buffer beams 15 862 mm 52 ft 1 2 in Distance between bogies 10 516 mm 34 ft 6 in See also editIndian locomotive class WDM 2 Indian Railways List of diesel locomotives of India Rail transport in IndiaReferences edit IR History Part V 1970 1995 Indian Railways Fan Club Retrieved 22 August 2017 Agarwal Avinash Kumal Dhar Atul Gautam Anirudh Pandey Ashok eds 2017 Locomotives and Rail Road Transportation Technology Challenges and Prospects Springer p 16 ISBN 978 981 10 3787 0 LCCN 2017930134 via Google Books About WDM 3A Indian Railways Fan Club Indian Railways http www dmw indianrailways gov in works uploads File Company 20Profile pdf Retrieved 2 March 2018 a href Template Cite web html title Template Cite web cite web a Missing or empty title help Direction Article Development of EFI for 204 stroke locomotive diesel engine PDF iitk ac in Indian Railways 2018 Retrieved 2 March 2018 Company Profile PDF indianrailways gov in Indian Railways Retrieved 2 March 2018 Motive Power PDF indianrailways gov in RDSO 2018 Retrieved 2 March 2018 Diesel Loco Roaster WDM ALCO series 30 October 2013 Railway Website Mechanical Department Retrieved 16 May 2020 https indianrailways gov in railwayboard uploads directorate mec engg downloads freight 2021 Diesel 20loco 20availability 20targets 20for 20June 202021 pdf bare URL PDF Diesel Locomotive Classes Broad Gauge Indian Railways Fan Club Diagram Book of WDM2C Locomotive PDF RDSO Retrieved from https en wikipedia org w index php title Indian locomotive class WDM 3A amp oldid 1223149112, wikipedia, wiki, book, books, library,
