Indian locomotive class WAG-3

The Indian locomotive class WAG-3 is a class of 25 kV AC electric locomotives that was imported from Europe in 1960s for Indian Railways. The model name stands for broad gauge (W), AC Current (A), Goods traffic (G) engine, 3rd (3). A total of 10 WAG-3 locomotives were built by The European Group 50Hz Group/European Group/50 Cycles Group (consortium) in 1965. They entered service in 1965.[1]

Indian locomotive class WAG-3
Type and origin
Power typeElectric
BuilderKraus-Maffei, Krupp, SFAC, La Brugeoise & Nivelle (50 cycles European group)
Build date1965
Total produced10
Specifications
Configuration:
​
 • AARB-B
 • UICB-B
Gauge5 ft 6 in (1,676 mm)
BogiesMonomotor B-B bogies
Wheel diameterNew:1,140 mm (3 ft 9 in)
Half worn: 1,120 mm (3 ft 8 in)
Full worn: 1,064 mm (3 ft 6 in)
Length14.600 m (47 ft 10 13⁄16 in)
Width3.109 m (10 ft 2 13⁄32 in)
Height4.165 m (13 ft 7 31⁄32 in)
Axle load18,640 kg (41,090 lb)
Loco weight74,000 kg (163,000 lb)
Electric system/s25 kV 50 Hz AC AC Overhead
Current pickup(s)pantograph
Traction motorsAGEC make, type 1580 A1 (1270V, 1040A, 680 rpm. Weight 5850kg.) Bogie mounted.
Loco brakeAir
Train brakesvacuum train brakes.
Performance figures
Maximum speed112 km/h (70 mph)
Power outputMAX:2930HP Continuous: 2,930 hp (2,185 kW)
Tractive effortStarting : 25,000 kgf (250 kN; 55,000 lbf)
Career
OperatorsIndian Railways
Numbers20869- 20878
LocaleAll over India
DispositionRetired

The WAG-3 served mainly freight trains for over 35 years. As of January 2020, All locomotives have been removed from service all were scrapped.

History

Ten locomotives of this type were ordered from European Group. All these locomotives have been assembled in Europe. First locomotive was put in service in July, 1965. The typical feature of these locomotives is a Monomotor bogie. This construction results in substantial saving in weight in traction equipment and gives better adhesion. These locomotives utilize silicon rectifiers for conversion of ac power into dc. The traction motors are force ventilated and are fully suspended type. These motors are permanently grouped in parallel and controlled by tap changer and field weakening. The traction motors for the WAG3 were two units of Alstom MG1580A1 which output 23% more top power than the WAG1. This can be used for a multiple unit operation to a maximum of four locomotives.Compressed air brake for the loco and vacuum brake for the train are provided. In addition, these locomotives have been provided with rheostatic braking.WAG-4 is based on this class.

Specification
  • Build dates: 1963-66
  • Wheel arrangement: B-B ( monomotor bogies )
  • Traction motors:AGEC make, type 1580 A1 (1270V, 1040A, 680 rpm. Weight 5850kg.) Bogie mounted.
  • Gear ratio: 3.95:1
  • Transformer: Oerlikon BOT 3460. 32 taps.
  • Rectifiers: Two GL 82220 silicon rectifiers, 1000A/1270kW/1270V. Weight 650kg each.
  • Axle load: 21.3 t
  • Max. Haulage: 1820 t
  • Pantographs: Two Faiveley AM-12

Locomotive shed
  • All the locomotives of this class has been withdrawn from service.
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See also

References
    1. https://www.irfca.org/faq/faq-specs.html#WAP-1 [IRFCA] Indian Railways FAQ: Diesel and Electric Locomotive Specifications
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