Indian locomotive class WAG-7

WAG 7 / 7H

BHEL-made WAG7 of Erode Loco shed hauling freight

Type and origin
Power type	Electric
Builder	WAG-7 and WAG-7H : Chittaranjan Locomotive Works(CLW) WAG-7 : Bharat Heavy Electricals Ltd.(BHEL) and
Total produced	WAG-7 : 1970 WAG-7H : 2

Specifications
UIC class	Co′Co′
Gauge	5 ft 6 in (1,676 mm)
Bogies	ALCO Fabricated
Wheel diameter	New:1,092 mm (3 ft 7 in), Half worn:1,055 mm (3 ft 5 ¹⁄₂ in) and Full worn:1,016 mm (3 ft 4 in)
Wheelbase	3.8 m (12 ft 5 ⁵⁄₈ in)
Length	20.934 m (68 ft 8 ¹⁄₈ in)
Width	3.179 m (10 ft 5 ¹⁄₈ in)
Height	WAG-7 : 4.185 m (13 ft 8 ³⁄₄ in)^[1] WAG-7H : 4.135 m (13 ft 6 ³⁄₄ in)^[2]
Axle load	WAG-7 : 20.5 tonnes (20.2 long tons; 22.6 short tons) WAG-7H : 22 tonnes (22 long tons; 24 short tons)
Loco weight	WAG-7 : 123 tonnes (121 long tons; 136 short tons) WAG-7H : 132 tonnes (130 long tons; 146 short tons)
Electric system(s)	25 kV 50 Hz AC Overhead
Current collection	pantograph
Traction motors	WAG-7 : Hitachi HS15250A WAG-7H : Hitachi HS15250G
MU working	4
Loco brake	Air, Hand and Rheostatic (Friction)
Train brakes	Air, Vacuum and Dual
Safety systems	Slip control, Main overload relay, Over voltage relay, No volt relay, Earth fault relay, Low pressure governor, Vacuum Control Governor, Train parting alarms and Brake cylinder cutoff valve

Performance figures
Maximum speed	WAG-7 and WAG-7H(design) : 120 km/h (75 mph) WAG-7H(Actual) : 120 km/h (75 mph)
Power output	Max : 5,850 hp (4,360 kW) Continuous : 5,600 hp (4,180 kW)
Tractive effort	WAG-7 starting : 48 tons WAG-7 continuous : 45 tons? WAG-7H starting : 91 tons?
Factor of adh.	0.345

Career
Operators	Indian Railways
Numbers	WAG-7 : 27001-28770 , 24501-24700 WAG-7H : 28024 and 28739
Nicknames	SHANTIDAN, EKTA, KARAMVIR, GAJRAJ, SWARNABHA, SARVOTTAM, SAMARPAN, CAUVERY, SAMRAT, PRAYAS & AGRASAR
Locale	All over India
Disposition	active

WAG-7 (old variant) belonging to Electric Loco Shed, Kazipet

WAG 7 is the name of a type of electric locomotive used in India. It is the 7th class of Wide Gauge's(W) AC charged(A) and Freight-dedicated(G-Goods) locomotives. Built by Chittaranjan Locomotive Works and BHEL, Jhansi to RDSO specifications. WAG7 is an uprated version of WAP-4B locomotive with high capacity transformer, rectifier, traction motor, compressor and other matching associated equipments. On 3 August 1992, the first WAG-7 locomotive was inaugurated and christened the name 'SHANTIDAN' in honor of Mother Teresa. The loco is controlled by a tap changer. Indian Railway is going to achieve 7,000,000 tonnes (6,890,000 long tons; 7,720,000 short tons) of traffic, WAG 7 is the main stay of loco. In the locomotive vehicle market WAG 7 is more economical option and one of the most affordable in the world. Hence, it has the highest production figures of any locomotive in India.

The first 71 of this class initially or still homed at Mughalsarai (MGS) shed and the second was Kanpur (CNB). Some units are retrofitted with Static Converters(STC) instead of Arno Rotary Converters. STCs are more efficient and require less maintenance. Also, STCs have self diagnostics making troubleshooting easier. WAG-7H is a heavy variant of WAG-7. WAG-7H #28739 has thicker under-frames. WAG-7 #27445 has closed-circuit cameras to monitor the pantograph along with a spotlight to illuminate the same at night, green lamps to exchange signals and a single windscreen on either side. New Katni (NKJ) shed has added Overhead Equipment(OHE) monitors. Some WAG-7 units have A.C. cabs, SIV, MPFDCS, MPCS, Single arm pantograph, FDCS, Additional COC, Rear-view mirrors, STS, Daulat Ram's Roof-mounted DBRs, SI, Modified ceilings, Bucket seats, Waist-level headlamps, High-reach pantographs, Vigilance Control Device(VCD), Wireless Multiple Control, Vertical Dynamic Brake Resistor(DBR) and microprocessor control. Some units have their MU cables removed. One unit has SCHUNK pantograph. Some units are assembled at Dahod Workshops. Initially WAG-7 had the body-shell similar to WAG-5 but later on all WAG-7 are/were fitted with WAP-4 shell since this provided more space. WAG-7H have WAP 4 shell since beginning. Older WAG-7s have Tiger Face liveries (Red/Dark Blue on white) but newer WAG-7s by CLW have yellow stripe on blue livery. All BHEL built WAG-7s have Tiger Face livery. Now, even some older WAG-7s are repainted with yellow stripe on blue livery. It is also the most powerful indigenously designed freight-dedicated locomotive in India.

Technical specifications^[3]

Traction Motors	a variant of the standard HS15250 with higher current rating (thicker wire gauge, better insulation); Motors built by CLW and BHEL. 6 motors in parallel grouping
Traction Motors Class of Insulation for Armature and Field	C
Traction Motors Suspension	Axle hung and Nose-suspended
Traction Motors Weight	3,650 kg (8,050 lb)
Traction Motors Temperature rise in Armature	90 degrees Celsius (194 degrees Fahrenheit)
Traction Motors Temperature Rise in Field	70 degrees Celsius (158 degrees Fahrenheit)
Traction Motors Temperature rise in Commutator	85 degrees Celsius (185 degrees Fahrenheit)
Traction Motors Coil resistance at 110 degrees Celsius (230 degrees Fahrenheit) of Armature	0.0126 ohms
Traction Motors Coil resistance at 110 degrees Celsius (230 degrees Fahrenheit) of Main pole	0.0117 ohms
Traction Motors Coil resistance at 110 degrees Celsius (230 degrees Fahrenheit) of Inter pole	0.0089 ohms
Traction Motors Continuous rating	630 kW (840 hp), 750 V, 900 A, 895 rpm
Traction Motors rating for 1 hour	670 kW (900 hp), 750 V, 960 A, 877 rpm
Traction Motors Air gap for Main pole	6.35 mm (0.250 in)
Traction Motors Air gap for Inter pole	10 mm (0.394 in)
Gear Ratio	WAG-7 : 65:16 and 18:64 and WAG-7H : 65:16
Transformer	CCL India, type CGTT-5400, Primary rating (5670 kVA, 252 A) Secondary rating (5400 kVA, 1000V, 5400 A), Tertiary rating 270 V, 32 taps, 12,200 kg (26,900 lb), Forced Oil cooling, Class A Insulation
Rectifiers	Two silicon rectifiers, cell type S18FN350 (from Hind Rectifier), 64 per bridge, Continuous rating 2700 A / 1050 V per cubicle, Max starting current 3300 A, Forced air cooling
Pantographs	Two Stone India (Calcutta) type AM-12, 235 kg (518 lb) including 4 insulators
Bogie drive arrangement	Gear pinion
Current Ratings	1350 A/2min, 1200 A/10min, 960 A/hr, 900 A continuous
Number of sandboxes	8
Permanent shunt	5%
2 Headlights	32 V, 50 W
Lead Acid batteries	50 cells, 110 V(5 hour rating)
Arno Converter Input	216 kVA, 415 V, 1 phase 520 A
Arno Converter Out put	150 kVA, 415 V, 3 phase 210 A, 1485 rpm
2 TRC-2000 type Compressors by Elgi	10.5 kg/cm² (149 psi)
2 Compressor Motors	30 hp (22 kW), 415 V, 930 rpm
2 Exhauster Motors	7.5 kW (10.1 hp), 415 V, 970 rpm
2 250 RE type Exhausters by Northey	4,500 L/min (990 imp gal/min; 1,200 US gal/min)
2 SF India Ltd. Traction Motor Blowers	276 m³/min (9,700 cu ft/min)
2 Traction Motor Blower Motors by Siemens	415 V, 26 kW (35 hp), 50 A, 2920 rpm
2 PFT-59 type Smoothing Reactors by SF India Ltd.	4,200 m³/min (150,000 cu ft/min)
2 Smoothing Reactor Motors	2.2 kW (3.0 hp), 415 V, 2860 rpm
2 KDBR-1 type Breaking Resistor Blowers by KEC International	510 m³/min (18,000 cu ft/min)
Breaking Resistor Blower Motor	30 kW (40 hp), 450 V, 76 A DC, 3300 rpm
Brushes grade	EG1055/BG 1165 (Margnite)
Brushes type	2 split
Brushes size	200 mm × 40 mm × 64 mm (7.874 in × 1.575 in × 2.520 in)
Brushes Wear limit	25 mm (0.984 in)
2 PHMX-40-6 type Rectifier Blowers by SF India Ltd.	3,100–3,200 m³/h (110,000–110,000 cu ft/h)
2 Rectifier Blower Motors	2.2 kW (3.0 hp), 415 V, 4.8A, 2860 rpm
MLBH-60-1-H2 type Coil Cooler Blower by SF India Ltd.	22,200 m³/h (780,000 cu ft/h)
Coil Cooler Blower Motor	22 kW (30 hp), 415 V, 45 A, 1450 rpm
Oil Pump by Best & Co. Pvt. Ltd.	730 L/min (160 imp gal/min; 190 US gal/min)
Oil Pump Motor	32 kW (43 hp), 415 V, 2865 rpm
2 SL 30 type Smoothing Reactors	1250 V, 1350 A
Smoothing Reactor Resistance at 110 degrees Celsius (230 degrees Fahrenheit)	0.00344 ohms

Sheds

Ajni (AJNI)
Angul (ANGL)
Arakkonam (AJJ)
Asansol (ASN)
Bhilai (BIA)
Bhusaval (BSL)
Bokaro Steel City(BKSC)
Bondamunda (BNDM)
Erode (ED)
Jhansi (JHS)
Kalyan (KYN)
Kanpur (CNB)
Kazipet (KZJ)
Lallaguda (LGD)
Ludhiana (LDH)
Mughalsarai (MGS)
Netaji Subhas Chandra Bose Gomoh (GMO)
New Katni Junction (NKJ)
Tatanagar (TATA)
Tughlakabad (TKD)
Valsad (BL)
Vijayawada (BZA)
Visakhapatnam (VSKP)
Khanalampura (KJGY)

Performance

WAG-7 with a gear ratio of 18:64 has the following capacity while hauling BOX wagons (in tonnes):

Level/Grade	Start	20	30	40	50	60	70	80	90	100
Level	7500+	7500+	7500+	7500+	7500+	7500+	7500+	7500+	5236	3732
1 in 500	5859	5859	5859	5859	5859	5765	4555	3808	2714	2003
1 in 200	4065	4065	4065	4065	3982	3125	2510	2135	1540	1148
1 in 150	3468	3330	3272	3210	3145	2476	1995	1703	1229	916
1 in 100	2669	2294	2265	2234	2201	1736	1401	1198	861	638
1 in 50	1512	1149	1140	1131	1121	879	704	599	419	300

WAG-7 with a gear ratio of 18:64 has the following capacity while hauling BOXN wagons (in tonnes):

Level/Grade	Start	20	30	40	50	60	70	80	90	100
Level	7500+	7500+	7500+	7500+	7500+	7500+	7500+	7500+	5404	3793
1 in 500	6836	6836	6836	6836	6836	6016	4712	3904	2759	2021
1 in 200	4516	4433	4328	4209	4088	3198	2558	2166	1555	1154
1 in 150	3790	3425	3361	3288	3212	2523	2026	1723	1238	920
1 in 100	2859	2340	2308	2272	2233	1759	1416	1208	866	640
1 in 50	1575	1161	1152	1141	1130	885	708	602	420	300

WAG-7 with a gear ratio of 65:16 has the following capacity while hauling BOXN wagons (in tonnes):

Level/Grade	Start	20	30	40	50	60	70	80	90	100
Level	10815	7500+	7500+	7500+	7500+	7500+	7500+	7302	4619	2785
1 in 500	7169	7169	7169	7169	7169	6192	5005	3465	2345	1465
1 in 200	4738	4738	4738	4738	4085	3285	2715	1915	1295	820
1 in 150	3977	3960	3880	3795	3210	2590	2150	1515	1020	645
1 in 100	3002	2705	2665	2625	2225	1805	1500	1055	725	450
1 in 50	1700	1345	1335	1320	1120	905	750	515	-	-

WAG-7H has the following capacity while hauling BOX wagons (in tonnes) :

Level/Grade	Start	20	30	40	50	60	70	80
Level	6000+	6000+	6000+	6000+	6000+	6000+	6000+	6000+
1 in 500	6000+	6000+	6000+	6000+	6000+	5930	4835	3380
1 in 200	4350	4350	4350	4350	4040	3210	2665	1885
1 in 150	3710	3710	3710	3705	3245	2545	2115	1500
1 in 100	2855	2655	2620	2580	2195	1780	1485	1045
1 in 50	1660	1330	1320	1310	1110	895	745	510

WAG-7H has the following capacity while hauling BOXN wagons (in tonnes) :

Level/Grade	Start	20	30	40	50	60	70	80
Level	6000+	6000+	6000+	6000+	6000+	6000+	6000+	6000+
1 in 500	6000+	6000+	6000+	6000+	6000+	6000+	5005	3465
1 in 200	4835	4835	4835	4835	4085	3285	2715	1915
1 in 150	4135	3960	3880	3795	3210	2590	2150	1515
1 in 100	3060	2705	2665	2625	2225	1805	1500	1055
1 in 50	1730	1345	1335	1320	1120	905	750	515

Image Gallery

WAG-7 (old variant) belonging to Electric Loco Shed, Kazipet
Jhansi based WAG 7 loco - 27072 with BTPN (Tank-car rakes)
Lallaguda WAG-7 (28068) with a Freight train
WAG-7 (27486) of Erode with a freight train at Pithapuram
WAG 7 locomotive of Mughalsarai shed
BOXN freight action with WAG 7 loco
WAG-7 class electric locomotive of Indian Railways

References

External links

Wikimedia Commons has media related to Indian locomotive class WAG7.

Broad gauge locomotives of India

Steam

BESA designs	SP SG PT HP AP HG HT

IRS designs	XA XB XC XD XE XF XG XH XP XT XS

World War II designs	AWD CWD AWC

IGR standard designs	WP WG WL (1st) WL (2nd) WM WT WU WV WW

Diesel

Mixed type	WDM-1 WDM 2 WDM 2A, WDM 2B WDM 3 WDM 3A WDM 3A R WDM 3C, WDM 3D WDM 4 WDM 6 WDM 7

Passenger	WDP 1 WDP 2/3A WDP 3 WDP 4 WDP 4B WDP 4D

Goods	WDG 2/3A WDG 3B, WDG 3C, WDG 3D WDG 4 WDG 5

Shunting	WDS 1 WDS 2 WDS 3/4C WDS 4, WDS 4A, WDS 4B, WDS 4D WDS 4C WDS 5 WDS 6 WDS 8

DC electric

Mixed type	WCM 1 WCM 2 WCM 3 WCM 4 WCM 5 WCM 6

Passenger	WCP 1, WCP 2 WCP 3, WCP 4

Goods	WCG 1 WCG 2

AC electric

Mixed type	WAM 1 WAM 2 WAM 3 WAM 4

Passenger	WAP 1 WAP 2 WAP 3 WAP 4 WAP 5 WAP 6 WAP 7

Goods	WAG 1 WAG 2 WAG 3 WAG 4 WAG 5 WAG 5A, WAG 5B WAG 6A WAG 6B, WAG 6c WAG 7 WAG 9

Dual (AC and DC) electric

Mixed type	WCAM 1 WCAM 2/2P WCAM 3

Goods	WCAG 1

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