Indian locomotive class WAP-7

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WAP-7
300px
A Ghaziabad WAP 7 in Duronto livery hauling the Mumbai Rajdhani Express
Type and origin
Power type Electric
Builder Chittaranjan Locomotive Works, West Bengal, India
Total produced 234 As of December 2015
Specifications
Gauge 5 ft 6 in (1,676 mm)
Electric system(s) 25 kV 50 Hz AC AC Overhead
Current collection pantograph
Performance figures
Maximum speed Test Speed: 160 km/h (99 mph)
Operational Maximum:140 km/h (87 mph)
Power output Maximum: 6,350 hp (4,735 kW)
Continuous: 6,000 hp (4,474 kW)
Career
Operators Indian Railways
Numbers 30201 onwards
Locale Northern Railways , South-Central Railway , Eastern Railway , Central Railway , Southern Railway zone , South East Central Railway

WAP 7 is a High Speed locomotive developed by Chittaranjan Locomotive Works by modifying the gear ratio of existing WAG 9 class. It is capable of hauling trains at speeds ranging between 110 to 140 kilometres per hour (68 to 87 mph) and is now largely used by Northern Railways (NR), South Central Railways (SCR), Southern Railways (SR), Eastern Railways (ER), South East Central Railway (SECR), Central Railways (CR), West Central Railways (WCR). As of September,2015 there are 236 locomotives in service. Please see the Following Link for detailed info about 236 Locos produced by CLW so far: http://www.irfca.org/apps/locos/list?loco_class_id=43&page=1 In this all the locomotives having A.R tight lock couplers, Chain link couplers are fitted.

Similarity with Freight 3-Phase Loco WAG 9

The WAP-7 is actually a modified version of the WAG 9 freight locomotive with modified gear ratios and is set to replace the fleet of WAP 4s, the most widely used passenger locomotive today.

Performance

With a maximum speed rating of 160 km/h (99 mph),[1][2][3] the WAP-7 has the highest acceleration figures while hauling mail/express trains. The WAP-7 can also haul loads of 24-26 passenger coaches (1,430–1,550 t or 1,410–1,530 long tons or 1,580–1,710 short tons at 140 km/h or 87 mph).[4] At a trial conducted by Indian Railways, it clocked a speed of 160 km/h (99 mph). It is the most successful passenger locomotive on the Indian Railways roster after the WAP-4. It is used to haul premium trains like the Rajdhani Express and the Shatabdi Express apart from other regular mail/express trains.[5] It also regularly hauls other trains like the Hyderabad - New Delhi, H.Nizamuddin-Thiruvananthapuram, H.Nizamuddin-Chennai, H.Nizamuddin-Bangalore, New Delhi-Sealdah and the New Delhi - Mumbai Rajdhani Express and Nizamuddin-Ernakulam Duronto Express.

12952 Mumbai Rajdhani Express with a WAP 7 engine at New Delhi

WAP-7 locomotive can deliver 6,000 hp (4,500 kW) with regenerative braking being one of its salient features. The regenerative braking is deployed on down gradients conserving energy to the tune of 30-35 percent. It has an inbuilt microprocessor based fault diagnostic system to make trouble shooting easier.[6] Another feature of this locomotive is that it eliminates the need to have separate EOG sets for air-conditioning in long distance trains hence providing significant amount of 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 "End on Generation" in which a Power Car equipped with diesel generator capable of generating adequate power of 3-phase 50 Hz 415 V / 750 V AC (called 'hotel load') is provided at either end of the train rake to supply power.[7][8][9]

Technical specifications

Manufacturers Chittaranjan Locomotive Works[10]
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). *95% efficiency.)[10]
Gear Ratio 72:20[10]
Axle load 20.5 t (20.2 long tons; 22.6 short tons)[10]
Power 6,350 hp (4,740 kW)[10]
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Unsprung mass per axle 3.984 t (3.921 long tons; 4.392 short tons)[10]
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Length over headstocks Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value).[10]
Body width Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value).[10]
loco weight 123 t (121 long tons; 136 short tons)[10]
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Pantograph locked down height Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value).[10]

Locomotive Sheds

The current locomotive sheds which house this locomotive are:

  1. Ghaziabad (Code:GZB)
  2. Lallaguda (Code:LGD)
  3. Ajni (Code:AQ)
  4. Howrah (Code:HWH)
  5. Santragachi (Code:SRC)
  6. Bhilai (Code:BIA)
  7. Royapuram (Code:RPM)
  8. Tughlakabad (Code:TKD)

Named Locos

  • WAP-7 30201 Navkiran
  • WAP-7 30202 Navbharti
  • WAP-7 30209 Navchetak
  • WAP-7 30215 Navgati
  • WAP-7 30227 Champalal

Trains hauled by WAP-7

File:Vaihai Express WAP7 1.jpg
Southern Railway's prestigious train Vaigai Express Hauling by WAP -7

Accidents and incidents

On 10 July 2011 Kalka Mail derailed on the Kanpur-Fatehpur line near the Fatehpur railway station , more than 69 persons died and 200 were injured,some critically. The train was hauled by Ghaziabad-based WAP 7 30221. Malfunction of the undergear of the locomotive could also be a reason. The driver of the Kalka Mail said he saw the engine shaking.[11] A post-accident diagnostic revealed that the first axle (leading) of the locomotive registered a jerk and the fourth axle (trailing bogie) showed loss of contact of the wheel with the track. The locomotive in question has been re-railed and is undergoing fault diagnostics and repairs.

On 14 December 2014 the 12381 UP Howrah - New Delhi Poorva Express derailed at 8.27 am after leaving Howrah at 8.15 am. 11 sleeper coaches and a pantry car (AC Hot Buffer Car) of the New Delhi-bound Poorva Express derailed at Liluah shortly after leaving Howrah station. There was no casualty or injury to any passenger. Like Kalka Mail this train was also hauled by Ghaziabad-based WAP 7. But the locomotive did not face much damage hence after undergoing fault diagnostics and repairs the locomotive has been re-railed.

See also

References

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External links

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