Indian locomotive class WAG-9

The Indian locomotive class WAG-9 is a class of 25 kV AC electric locomotives that was developed in 1995 by ABB for Indian Railways. The model name stands for broad gauge (W), AC Current (A), Goods traffic (G), 9th generation (9) locomotive. They entered service in 1996. A total of 4650 WAG-9 have been built at Chittaranjan Locomotive Works (CLW), with more units being built at Banaras Locomotive Works (BLW), Bharat Heavy Electricals Limited (BHEL) and Patiala Locomotive Works (PLW). It was the most powerful freight locomotive of its fleet until the formal introduction of the WAG-12.

WAG-9
Lallaguda based WAG-9 twins at Ghatkesar.
Type and origin Power type Electric Builder Chittaranjan Locomotive Works, Bharat Heavy Electricals Limited, Banaras Locomotive Works, Patiala Locomotive Works Build date 1995 - present Total produced 5071 as of April 2024
Specifications Configuration: ​  • UIC Co′Co′ Gauge 5 ft 6 in (1,676 mm) Bogies Adtranz Fabricated Flexicoil IV Wheel diameter New:1,092 mm (3 ft 7 in), Half worn:1,054 mm (3 ft 5+1⁄2 in) Full worn:1,016 mm (3 ft 4 in) Wheelbase 15.7 m (51 ft 6 in) Length 20.562 m (67 ft 5+1⁄2 in) Width 3.152 m (10 ft 4+1⁄8 in) Height 4.525 m (14 ft 10+1⁄8 in) Axle load WAG-9 : 20.5 tonnes (20.2 long tons; 22.6 short tons) WAG-9H/Hi/9i : 22.0 tonnes (21.7 long tons; 24.3 short tons) Loco weight WAG-9 : 123 tonnes (121 long tons; 136 short tons) WAG-9H/9Hi/9i : 132 tonnes (130 long tons; 146 short tons) Electric system/s 25 kV 50 Hz AC Overhead Current pickup(s) dual pantographs Traction motors WAG-9/9H/9i : Adtranz 6FRA6068 MU working 2 Loco brake Air and Regenerative Train brakes Air Safety systems Slip/slide control, Main overload relay, Over voltage relay, No volt protection, Vigilance Control Device, Fire Detection Equipment, Fire Extinguishers and Earth fault relay
Performance figures Maximum speed 100 km/h (62 mph) Power output WAG-9 Original : 6,120 hp (4,564 kW) WAG-9HC : 6,120 hp (4,564 kW) WAG-9HH : 9,000 hp (6,711 kW) WAG-9TWIN : 12,000 hp (8,948 kW) Tractive effort Starting : 475 kN (107,000 lbf) (WAG-9), 510 kN (110,000 lbf) (WAG-9H/i/Hi) Continuous : 325 kN (73,000 lbf) at 50 km/h
Career Operators Indian Railways Numbers Starting from 31000-31999, 32000-32999, 33000-33999, 38000+ & 90001+ CLW 34001+ BHEL 41000-41500 & 43000+ BLW 41501+ PLW Locale All Over India Disposition Active

The WAG-9 is one of the most successful locomotives of Indian Railways serving freight trains for over 27 years. A passenger variant of the WAG-9 was developed namely the WAP-7 locomotive by modifying the gear ratio to pull lighter loads at higher speeds. Nowadays, it is a common locomotive used in freight trains.

Introduction

The WAG-9 locomotive is referred to as the "Heavy Haul" freight locomotive of the Indian Railways (IR). It was conceived in response to the extreme growth in the rail freight transportation sector, which is considered to be of great importance to the growth of the economy of India. The need for more electrification and electric locomotives in India had increased. Around 60-65% of the freight haulage of the IR takes place on the electrified section of the Golden Quadrilateral (Indian Railways) and diagonals (which account for 25% of the route). These are very busy routes, so clearance is a necessity. Electrical powers give it a great sectional clearance ability. Thus, these locomotives are important for the Indian Railways.

These locomotives have entered the Western Railway zone of Mumbai. The first 22 units were imported from ABB. Of these, the first six were fully assembled and rest were in kit form. CLW started producing of WAG-9 traction motors on 1 November 1999. The units built by ABB have pantographs with two end horns while the CLW built units have pantographs with single end horns which are common in India. This class had a capacity to MU several units, but IR restricts them to two, because of dynamic loading restriction on most bridges. Regenerative brakes provide about 260 kN of braking effort.

The WAG-9H also has different application software than the WAG-9. The first WAG-9H was commissioned on 30 June 2000. The #30130 prototype was housed at Gomoh (GMO). This was then converted back to standard WAG-9 in 2002. This unit has a livery of twin white stripes on green, instead of yellow stripe on green, seen on the other WAG-9(x)s.

The WAG-9i was introduced in 2010, and was No. 31215. It was homed at the GMO shed. With IGBT, even if one traction motor failed, other traction motors can function with a total output of 5500 hp.

Newer WAG-9 units have "CLW Glorious 60 years" marked on their sides. Some WAG-9(x)s are fitted with a solid cowcatcher while others are fitted with grilled cowcatchers. Some have American style flasher lamps while others have Indian style flasher lamps. http://elocos.railnet.gov.in/Study_Material/TSD_3Ph.pdf.

Newer versions of the WAG-9 feature full Insulated-gate bipolar transistor (IGBT) traction control; the debut model was the WAG-9 31248. The class as a whole is denoted by the WAG-9i prefix in its model number, although there is a technical variant of this class named WAG-9H, with the "H" meaning "Heavy".

The WAG-9H/9Hi locomotives are the second heaviest in regular service in India (after the WAG-12), the only freight-dedicated three-phase AC locomotives in the country, and the only electric locomotives in India fitted with IGBT. They are also the freight locomotives with the highest operational speed in India.

It is similar to the WAP-7 class locomotive but features a different gear ratio, which makes it suitable for heavy freight operations. In November 1998, the Chittaranjan Locomotive Works (CLW) started producing these with indigenous components. The first of which, named Navyug (New Era), was produced on 14 November 1998. Like the WAP-5 units, the WAG-9 has GTO thyristor converters and three-phase asynchronous motors.

Variants

The following variants are built from the WAG-9:

• WAG-9: Original version.
• WAG-9H: Heavy version with additional ballast, total weight: 132 t.
• WAG-9i: Version with IGBT Technology.
• WAG-9Hi: Version with additional ballast and IGBT Technology.
• WAG-9HC: Heavy version with Conventional Brake Rigging.
• WAG-9HH: Heavy Version with 9000  hp variant.
• WAG-9Twin: A 12000 hp variant developed by CLW to equal WAG-12 horsepower.

Operations

WAG-9 has quickly become one of the important locos in the Indian railways. With its higher power, this locomotive has replaced WAG-7 which was the main electric loco before WAG-9's arrival. Applications where twin WAG-7s were required are now handled by a single WAG-9. This includes both leading a long consist and for banking operations. The regenerative braking capabilities of WAG-9 has also helped reduce the electricity consumption. The original WAG-9 had some wheel slippage incidents while hauling heavy load. This was rectified through the introduction of WAG-9H and subsequently using WAG-9i. This has significantly reduced the issue that were associated with the original version.

Wag-9 Locomotive at Vangaon Railway station, pulling an automobile carrier rake.

Chittaranjan Locomotive Works (CLW) turned out its first 9,000 hp WAG-9 freight locomotive on 31 March 2019, the last day of the financial year. This 9,000 hp version of the WAG-9H has been classified by IR as WAG-9 HH. The first H stands for higher axle load and the second H stands for the higher power rating. The class has been allocated a block of serial numbers starting with 90001, the number of the first unit. The decision to upgrade the power output of the WAG-9 was taken to partly meet the demands of the upcoming electrified Western Dedicated Freight Corridor (WDFC). The upgraded locomotive class will also augment hauling capacity on the existing network of the Indian Railways.

Locomotive sheds

Zone	Name	Shed Code	Quantity			Introduction
			WAG-9	WAG-9H	WAG-9HH
Central Railway	Bhusawal	BSL		38		2013
	Ajni	AQ	2	194		2000
	Pune	PA (D)		26		2022
Eastern Railway	Asansol	ASN		137		2020
East Central Railway	Pt. Deen Dayal Upadhyaya	DDU	2	57		2020
	Gomoh	GMO	4	202		1997
	Barauni	BJU		152		2019
	Patratu	PTRU (D)	5	111		2020
East Coast Railway	Visakhapatnam	VSKP		205		2014
	Visakhapatnam (D)	VSKP (D)		225		2021
	Angul	ANGL		86		2023
Northern Railway	Ghaziabad	GZB		8		2023
	Ludhiana	LDH		230		2015
	Khanalampura	KJGY		124		2020
	Tughlakabad	TKD (D)		91		2022
North Central Railway	Kanpur	CNB		228		2016
North Eastern Railway	Gonda	GD (D)		18		2021
	Saiyedpur Bhitri	SYH		37		2022
	Izzatnagar	IZN (D)		10		2023
Northeast Frontier Railway	Malda Town	MLDT (D)		44		2021
	Siliguri	SGUJ (D)		13		2022
	New Guwahati	NGC (D)		7		2023
North Western Railway	Bhagat Ki Kothi	BGKT (D)		65		2023
Southern Railway	Arakkonam	AJJ		33		2020
South Central Railway	Vijayawada	BZA		75		2021
	Lallaguda	LGD	52	95		2007
	Kazipet	KZJ	3	164		2013
	Gooty	GY (D)		90		2019
	Vijayawada	BZA (D)		20		2023
	Moula Ali	MLY (D)		18		2023
South Eastern Railway	Tatanagar	TATA		193		2010
	Bondamunda	BNDM		226		2016
	Bokaro Steel City	BKSC		181		2019
	Rourkela	ROU		238		2019
	Bondamunda	BNDM (D)		14		2023
South East Central Railway	Bhilai	BIA		267		2009
	Bilaspur	BSP		188		2020
South Western Railway	Krishnarajapuram	KJM (D)		45		2020
	Hubli	UBL (D)		62		2022
Western Railway	Valsad	BL		179		2020
	Vatva	VTA (D)		72		2023
	Sabarmati	SBT (D)		20		2024
West Central Railway	Tughlakabad	TKD	21	130	50	2008
	New Katni Jn.	NKJ		174		2017
	Itarsi	ET		140		2020
Total			89	4932	50
Total Locomotives Active as of April 2024			5071

Performance

Two WAG-9 class units can haul a load of 4,500 tonnes (4,400 long tons; 5,000 short tons) on grades of 1 in 60 (1.67%). The WAG-9H was expected to haul 58 BOXN wagons, i.e.,4,700 tonnes (4,600 long tons; 5,200 short tons), without multiple units on grades of 1 in 150 (0.67%). The locomotive can run even in 100% humidity, or in deserts, where there is high saturation of conductive particles. For shunting up to 15 km/h (9.3 mph), it can haul 7,500 tonnes (7,400 long tons; 8,300 short tons) on grades of 1 in 1000 (0.1%) or less. The atmosphere may be humid and salty. Regenerative braking will provide braking force of no less than 260 kN (58,000 lb_f) at 10–62 km/h (6.2–38.5 mph) and closer to 260 kN (58,000 lb_f) at higher speeds. Below is the capacity of the WAG-9 while hauling BOX wagons (in tonnes}):

Grade\km/h	Start	20	30	40	50	60	70	80	90	100
Level	6000+	6000+	6000+	6000+	6000+	6000+	6000+	6000+	6000+	6000+
1 in 500	6000+	6000+	6000+	6000+	6000+	6000+	6000+	4985	4150	3500
1 in 200	5060	5060	5060	5060	5060	4045	3325	2780	2365	2040
1 in 150	4250	4250	4165	4080	3985	3200	2640	2220	1895	1640
1 in 100	3205	2910	2870	2825	2775	2240	1855	1565	1345	1165
1 in 50	1820	1455	1445	1435	1420	1440	945	795	680	590

See also

• Indian Railways
• Locomotives of India
• Rail transport in India

External links

• IR WAG-9 @ Trainspo