Indian locomotive class WAP-7

Specifications
Specifications
Gauge	5 ft 6 in (1,676 mm)
Bogies	Co-Co, Fabricated Flexicoil Mark IV bogies; bogie wheelbase 1,850 mm (72+7⁄8 in) + 1,850 mm (72+7⁄8 in)
Wheel diameter	1,092 mm (43 in) new, 1,016 mm (40 in) worn
Wheelbase	15,700 mm (51 ft 6+1⁄8 in)
Length:;
• Over beams	20,562 mm (67 ft 5+1⁄2 in)
Width	3,152 mm (10 ft 4+1⁄8 in)
Height:;
• Pantograph	4,255 mm (13 ft 11+1⁄2 in)
Axle load	WAP 7; 20.5 t (20.2 long tons; 22.6 short tons) WAP 7HS 18.08 t (17.79 long tons; 19.93 short tons)
Loco weight	123 t (121 long tons; 136 short tons)
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.
Transmission	Electric
Gear ratio	WAP 7 ; 72:20 ; WAP 7HS ; 70:22
Loco brake	Air and regenerative
Train brakes	Air

Type and origin
Type and origin
Power type	Electric
Builder	Chittaranjan Locomotive Works,; ; Banaras Locomotive Works,; Patiala Locomotive Works;
Build date	1999 - present
Total produced	1765 as of October 2024

WAP-7
WAP-7
	CLW made WAP-7 #30615 at CLW yard.
Power type
Type and origin
Power type	Electric
Builder	Chittaranjan Locomotive Works,; ; Banaras Locomotive Works,; Patiala Locomotive Works;
Build date	1999 - present
Total produced	1765 as of October 2024
Gauge
Specifications
Gauge	5 ft 6 in (1,676 mm)
Bogies	Co-Co, Fabricated Flexicoil Mark IV bogies; bogie wheelbase 1,850 mm (72+7⁄8 in) + 1,850 mm (72+7⁄8 in)
Wheel diameter	1,092 mm (43 in) new, 1,016 mm (40 in) worn
Wheelbase	15,700 mm (51 ft 6+1⁄8 in)
Length:;
• Over beams	20,562 mm (67 ft 5+1⁄2 in)
Width	3,152 mm (10 ft 4+1⁄8 in)
Height:;
• Pantograph	4,255 mm (13 ft 11+1⁄2 in)
Axle load	WAP 7; 20.5 t (20.2 long tons; 22.6 short tons) WAP 7HS 18.08 t (17.79 long tons; 19.93 short tons)
Loco weight	123 t (121 long tons; 136 short tons)
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.
Transmission	Electric
Gear ratio	WAP 7 ; 72:20 ; WAP 7HS ; 70:22
Loco brake	Air and regenerative
Train brakes	Air
Maximum speed
Performance figures
Maximum speed	140 km/h (87 mph) (WAP-7); 160 km/h (99 mph) (WAP-7HS) ; Potential speed: 180 km/h (110 mph) (WAP-7HS) 155 km/h (96 mph) (WAP-7);
Power output	Max 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
Operators
Career
Operators	Indian Railways
Numbers	30201+ CLW; 37001+ BLW; 39000+ PLW;
Locale	All over India
First run	19 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)

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


Zone	Name	Shed Code	Quantity		Introduction
Zone	Name	Shed Code	HOG	Non HOG	Introduction
Central Railway	Ajni	AQE	66	3	2010
	Kalyan	KYNE	69	5	2019
	Pune	PADX	41	1	2023
Eastern Railway	Howrah	HWHE	89		2012
Eastern Railway	Sealdah	SDAD	20	10	2020
East Central Railway	Gomoh	GMOE	46		2000
	Barauni	BJUE	6		2021
	Samastipur	SPJD	51		2022
East Coast Railway	Visakhapatnam	WATE	74	5	2016
Northern Railway	Ghaziabad	GZBE	107	39	2000
Northern Railway	Ludhiana	LDHE	31	4	2022
North Central Railway	Kanpur	CNBE	87		2019
North Eastern Railway	Gonda	GDDX	17		2021
	Izzatnagar	IZND	6		2023
	Gorakhpur	GKPL	7		2024
Northeast Frontier Railway	Siliguri	SGUD	9		2024
North Western Railway	Bhagat Ki Kothi	BGKD	34		2023
Southern Railway	Erode	EDE	76		2017
Southern Railway	Royapuram	RPME	104	10	2011
South Central Railway	Lallaguda	LGDE	120	33	2008
South Central Railway	Vijayawada	BZAE	69		2021
South Eastern Railway	Tatanagar	TATE	62		2017
	Bondamunda	BNDL	16		2018
	Santragachi	SRCE	22		2017
South East Central Railway	Bhilai	BIAE	11	2	2012
South Western Railway	Krishnarajapuram	KJMD	62		2019
South Western Railway	Hubli	UBLD	8		2024
Western Railway	Vadodara	BRCE	125		2016
Western Railway	Valsad	BLEE	45		2024
West Central Railway	Tughlakabad	TKDE	63	21	2013
West Central Railway	Itarsi	ETE	89		2018
Total			1631	134
Total Locomotives Active as of October 2024^[8]			1765

Gallery

Howrah based WAP7 on lead with 02302 New Delhi - Howrah Rajdhani Express Special at Janai Road
LGD WAP-7 30306 at Bangalore
Vijayawada WAP-7 39155 with 12075 Kozhikode Main Thiruvananthapuram Central Jan Shatabdi Express Skipping Thuravoor Railway Station in Kerala.
New Delhi-Lucknow Tejas Express powered by WAP-7, standing at New Delhi.
WAP-7 #30261 charging on time running 22416 NDLS-VSKP A.P. A.C. Express.
A Ghaziabad-based WAP-7 hauling the Bhubaneswar Rajdhani Express
WAP-7 with the Bangalore Rajdhani Express near Lingampally Railway Station
RPM based WAP-7
Jammu Tawi bound Humsafar Express leaving Kazipet Junction, hauled by VSKP WAP-7 No. 37062
12737 Goutami Express at Moula-ali with a WAP-7 loco
Ghaziabad-based WAP-7 locomotive at Anand Vihar Terminal