Indian locomotive class WDP-3A

The Indian locomotive class WDP-3A is a class of diesel-electric locomotive that was developed in 1998 by Diesel Locomotive Works (DLW), Varanasi for Indian Railways. The model name stands for broad gauge (W), Diesel (D), Passengers traffic (P) locomotive with 3100 horsepower (3A). The WDP-3A is a later classification of earlier WDP-2. They entered service in 1998. A total of 44 WDP-3A units were built at Diesel Locomotive Works (DLW), Varanasi between 1998 and 2001.

WDP - 3A
A GOC WDP-3A hauling the TVC Rajdhani
Type and origin
Power typeDiesel
BuilderDLW, DLMW
Serial numberWDP-2-1 to WDP-2-44
ModelALCO DL560C variant
Build dateOctober 4, 1998, to February 1, 2001
Total produced44
RebuilderDiesel-Loco Modernisation Works, Patiala
Specifications
Configuration:
​
 • UICCo-Co
Gauge1,676 mm (5 ft 6 in)
BogiesFlexicoil Mark V fabricated bogies
Wheel diameter1,092 mm (3 ft 7 in)
Wheelbase12.834 m (42 ft 1 1⁄4 in)
Length18.62 m (61 ft 1 1⁄8 in)
Width2.964 m (9 ft 8 3⁄4 in)
Height4.185 m (13 ft 8 3⁄4 in)
Axle load19,500 kg (43,000 lb)
Loco weight117 t (115 long tons; 129 short tons)
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
Performance figures
Maximum speed160 km/h (99 mph)
Power outputWDP-3A: 3100 HP,
Tractive effort30.45 t (30 long tons; 34 short tons)
Career
OperatorsIndian Railways
Numbers15501-15544
NicknamesToasters, Pushpak
LocaleSR (GOC), NER (IZN) and CR (KYN)
Dispositionactive

They are the Fastest ALCo based locomotive breed found in India with a Top speed of 160 Km/h, on par with the premier Electric Locomotives.The WDP-3A served IR for over 22 years. A significant number of these locomotives are still in use, both on mainline and departmental duties. As of January 2020, most of the locomotives still retain "operational status" on the mainline as WDP-3A, with further examples having been used for departmental works.

History

The first one was delivered on October 1998,under the name of WDP-2.[1] 44 units produced till February 2001 (Indian Railway road number 15501-15544) had dual cab forward design different from other classes of locos built by DLW (WDM3A, WDG3A and WDP1).[2] These new locomotives have control stand similar to many electric locomotives. They are the re-geared versions of the WDM-3A. This was IR’s attempt to build a high speed loco on ALCO platform. But the EMD locos came with a much better performance with higher HP rating to kill the prospect of WDP3As. These units have air brakes only and the gear ratio is 64:19.[3]

These locos (WDP-2s then) were introduced initially the Chennai Egmore - Kanyakumari Section, hauling many Prestigious trains like Pallavan Express, Vaigai Express, Rockfort Express, Nellai Express, Pothigai Express, to name a few.

A problem with the WDP-3A was that it would get uncomfortably hot inside the driving cabin on the radiator side and the locos were nicknamed “toasters” by the loco pilots. The WDP3A was best known for hauling the Trivandrum Rajdhani and later on the Mumbai CSMT - Karmali Tejas Express through the Konkan Railway at a Top Speed of 120 Kmh single handedly.

However due to age issues, the WDP3A locomotives of DLS GOC and KYN were withdrawn gradually from hauling the Trivandrum Rajdhani and Tejas express.

In 2018, a couple of GOC Based WDP3A locomotives were rebuilt at DMW Patiala with better bogies for Riding comfort. Such Rebuilt toasters bear the suffix 'R' to their road numbers.

Locomotive sheds
GOC WDP-3A with Thiruvananthapuram Rajdhani Express
Tughlakabad WDP-3A
ZoneNameShed CodeQuantity
Central RailwayKalyanKYN10
Northern RailwayTughlakabadTKD20
Southern RailwayGolden RockGOC9
Total Locomotives Active as of 01-08-2020[4]39
KYN WDP-3A hauling the Mumbai-Karmali Tejas Express
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See also

References
  1. "IR History: Part - VI (1970-1995)". Indian Railways Fan Club. Retrieved 22 August 2017.
  2. 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.
  3. "About WDP-3A". Indian Railways Fan Club.
  4. "Railway Website Mechanical Department". Retrieved 16 May 2020.
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