Indian locomotive class WAM-4

WAM-4

WAM-4 of Itarsi Electric Loco Shed
Power type	Electric
Builder	Chittaranjan Locomotive Works, India
UIC classification	Co′Co′
Gauge	5 ft 6 in (1,676 mm)
Axle load	18.8 tonnes (18.5 long tons; 20.7 short tons)
Electric system(s)	25 kV AC
Current collection method	Overhead with pantograph
Top speed	110 km/h (68 mph)
Power output	3,850 hp (2,870 kW)
Career	Indian Railways
Locale	All over India

WAM-4 is the name of a type of electric locomotive used in India. It is a very successful locomotive in Indian Railways' fleet. The first one was indigenously designed and built by CLW in 1970-71. They were produced until about 1997. They use the same power bogies as the successful WDM-2 class. These locos feature rheostatic braking, and MU capability. Being designed specially for mixed traffic these locos has rendered excellent service.

Technical specifications^[1]

Traction Motors	Alstom TAO 659 A1 (575kW, 750V). Six motors, axle-hung, nose-suspended, force-ventilated.
Gear Ratio	15:62 originally (and still for WAM-4 2S3P), now many variations, 21:58 being common for WAM-4 6P locos.
Transformer	Heil BOT 3460 A, 22.5kV / 3460kVA.
Rectifiers	Two silicon rectifier cells, 1270V / 1000A each cubicle.
Pantographs	Two Faiveley AM-12.
Hauling capacity	2010t
Current Ratings	(WAM-4 6P) 1100A/10min, 750A continuous