Indian locomotive class WAP-7

Last updated

WAP-7
WAP-7-LOCO.jpg
CLW made WAP-7 at CLW yard.
Type and origin
Power type Electric
Builder Chittaranjan Locomotive Works,
Banaras Locomotive Works,
Patiala Locomotive Works
Build date1999 - present
Total produced1635 as of April 2024
Specifications
Gauge 5 ft 6 in (1,676 mm)
Bogies Co-Co, Fabricated Flexicoil Mark IV bogies; bogie wheelbase 1,850 mm (72+78 in) + 1,850 mm (72+78 in)
Wheel diameter1,092 mm (43 in) new, 1,016 mm (40 in) worn
Wheelbase 15,700 mm (51 ft 6+18 in)
Length:
  Over beams20,562 mm (67 ft 5+12 in)
Width3,152 mm (10 ft 4+18 in)
Height:
  Pantograph4,255 mm (13 ft 11+12 in)
Axle load WAP 7

20.5 t (20.2 long tons; 22.6 short tons) [1]

WAP 7HS

18.08 t (17.79 long tons; 19.93 short tons) [2]
Loco weight123 t (121 long tons; 136 short tons) [3]
Power supply 3-phase 2180 V 50 Hz
Electric system/s 25 kV 50 Hz AC Overhead
Current pickup(s) Pantograph
Traction motors 6FRA 6068 3-phase squirrel-cage induction motors
850 kW (1,140 hp), 2180 V, 1283/2484 rpm, 270/310A;
Weight-2,100 kg (4,600 lb), forced-air ventilation, axle-hung, nose-suspended;
Torque 6,330–7,140 N⋅m (4,670–5,270 lbf⋅ft)
~88% efficiency.
TransmissionElectric
Gear ratioWAP 7
72:20
WAP 7HS
70:22
Loco brake Air and regenerative
Train brakes Air
Performance figures
Maximum speed140 km/h (87 mph) (WAP-7)

160 km/h (99 mph) (WAP-7HS)
Potential speed: 180 km/h (110 mph) (WAP-7HS)

155

Contents

 km/h (96 mph) (WAP-7)
Power outputMax Power : 6,350 hp (4,740 kW)
Continuous: 6,120 hp (4,563.68 kW)
Tractive effort Starting : 322.4 kN (72,500 lbf)
Continuous : 228 kN (51,000 lbf) at 71 km/h
Career
Operators Indian Railways
Numbers30201+ CLW

37001+ BLW

39000+ PLW
LocaleAll over India
First run19 May 2000

The Indian locomotive class WAP-7 is a class of 25 kV AC electric locomotives that was developed in 1999 by Chittaranjan Locomotive Works (CLW) for Indian Railways. The model name stands for broad gauge (W), AC Current (A), Passenger traffic (P) locomotive, 7th generation (7). They entered service in 2000. A total of 1609 WAP-7 have been built, with more units being built at CLW, Banaras Locomotive Works (BLW) and Patiala Locomotive Works (PLW).

The WAP-7 is the most successful locomotives of Indian Railways serving passenger trains for over 23 years. It is a passenger variant of the WAG-9 freight locomotive with a modified gear ratio to pull lighter loads at higher speeds. With an output of 6125HP, it is the most powerful passenger locomotive in the Indian Railways fleet, and the most numerous passenger locomotive in India. The WAP-7 is capable of hauling 24 coach trains at speeds 110–140 km/h (68–87 mph).

History

It is now largely used by Northern Railways (NR), South Central Railways (SCR), Central Railways (CR), South East Central Railways (SECR), South Eastern Railways (SER), West Central Railways (WCR), Eastern Railways (ER), Western Railways (WR), North Central Railways (NCR), South Western Railways (SWR), Southern Railways (SR), East Central Railways (ECR), East Coast Railways (ECoR), North Eastern Railways (NER), North Western Railways (NWR) etc. among other zones. As of October 2021, all of which are fitted with H-type transition couplers which are compatible with both screw coupling and centre-buffer coupling. In February 2017, Banaras Locomotive Works built their first WAP 7 class locomotive. [4]

In 2019, a variant of the WAP-7, designated the WAP-7HS, was introduced for higher speeds. The WAP-7HS has a max speed of 180 km/h (110 mph), and is capable of hauling a 24-car train at 160 km/h (99 mph) as opposed to the 140 km/h (87 mph) of the original. Indian Railways plans to use the WAP-7HS for Shatabdi, Rajdhani, and Duronto express trains. However, as of September 2022, it has not been confirmed if any others have been built, and the single completed WAP-7HS has stayed restricted to 130 km/h (81 mph).

Head-on Generation (HOG)

The HOG ports are equipped on right side upper and left side down on Erode based WAP-7 at White Field railway station Indian Electric Locomotive WAP-7 ED - 39231.jpg
The HOG ports are equipped on right side upper and left side down on Erode based WAP-7 at White Field railway station

A main feature of Majority locomotives of this class is that they eliminate the need to have separate End on Generation (EOG) sets or DG (Diesel Generator) sets for supplying power to the train resulting in significant savings on maintenance and running costs. This technology, called HOG or "Head On Generation", transfers electric power from the loco's pantograph to the coaches instead of EOG where a power car equipped with diesel generator capable of generating adequate power of 3-phase 50 Hz 415 V / 750 V AC (called 'head-end power') is provided at either end of the train rake to supply power. [5] [6] [7]

Locomotive sheds

ZoneNameShed CodeQuantityIntroduction
HOGNon HOG
Central Railway Ajni AQ6832010
Kalyan KYN6262019
Pune PA (D)2712023
Eastern Railway Howrah HWH872012
Sealdah SDAH18122020
East Central Railway Gomoh GMO462000
Barauni BJU62021
Samastipur SPJ (D)452022
South Coast Railway Visakhapatnam VSKP5952016
Northern Railway Ghaziabad GZB119392000
Ludhiana LDH2542022
North Central Railway Kanpur CNB822019
North Eastern Railway Gonda GD (D)212021
Izzatnagar IZN (D)62023
Northeast Frontier Railway Siliguri SGUJ22024
North Western Railway Bhagat Ki Kothi BGKT (D)232023
Southern Railway Erode ED762017
Royapuram RPM99122011
South Central Railway Lallaguda LGD103382008
Vijayawada BZA442021
South Eastern Railway Tatanagar TATA582017
Bondamunda BNDM162018
Santragachi SRC262017
South East Central Railway Bhilai BIA922012
South Western Railway Krishnarajapuram KJM (D)482019
Western Railway Vadodara BRC1662016
West Central Railway Tughlakabad TKD80222013
Itarsi ET702018
Total1494141
Total Locomotives Active as of April 2024 [8] 1635

See also

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References

  1. "[IRFCA] Indian Railways FAQ - AC Electric Locomotives".
  2. "What are the specifications of WAP 7 HS?".
  3. "[IRFCA] Indian Railways FAQ - AC Electric Locomotives".
  4. "Brief History of DLW". Ministry of Railways, Government of India. Retrieved 30 December 2017.
  5. "Train had WAP-7 engine, 'black box' may reveal cause". Zee News. 9 August 2010. Retrieved 25 August 2012.
  6. "Recent Developments". Chittaranjan Locomotive Works . Retrieved 25 August 2012.
  7. "Development of Electric locomotive with Head On Generation (HOG) facility" (PDF). Indian Railways.
  8. "e-Locos".