Indian locomotive class WAP-7

Last updated

WAP-7
WAP-7-LOCO.jpg
CLW made WAP-7 #30615 at CLW yard.
Type and origin
Power type Electric
Builder
Build date1999 - present
Total produced1742 as of September 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
Numbers
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 1676 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[ peacock prose ] serving passenger trains since its introduction in 1999. 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 6,125 hp, it is the most powerful passenger locomotive in the Indian Railways fleet, and the most numerous passenger locomotive in India.[ peacock prose ] The WAP-7 is capable of hauling 24 coach trains at speeds 110–140 km/h (68–87 mph).

History

It is now[ when? ] 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), Northeast Frontier Railways (NFR) among other zones. As of October 2021, all of these 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 AQE6632010
Kalyan KYNE6952019
Pune PADX4112023
Eastern Railway Howrah HWHE892012
Sealdah SDAD20102020
East Central Railway Gomoh GMOE462000
Barauni BJUE62021
Samastipur SPJD462022
East Coast Railway Visakhapatnam WATE7152016
Northern Railway Ghaziabad GZBE105392000
Ludhiana LDHE3142022
North Central Railway Kanpur CNBE842019
North Eastern Railway Gonda GDDX172021
Izzatnagar IZND62023
Gorakhpur GKPL62024
Northeast Frontier Railway Siliguri SGUD82024
North Western Railway Bhagat Ki Kothi BGKD342023
Southern Railway Erode EDE762017
Royapuram RPME104102011
South Central Railway Lallaguda LGDE120332008
Vijayawada BZAE642021
South Eastern Railway Tatanagar TATE622017
Bondamunda BNDL162018
Santragachi SRCE222017
South East Central Railway Bhilai BIAE1122012
South Western Railway Krishnarajapuram KJMD622019
Hubli UBLD52024
Western Railway Vadodara BRCE1252016
Valsad BLEE452024
West Central Railway Tughlakabad TKDE63212013
Itarsi ETE892018
Total1608134
Total Locomotives Active as of September 2024 [8] 1742

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".