The Indian locomotive class WAG-7 is a class of 25 kV AC electric locomotives that was developed in 1990 by Chittaranjan Locomotive Works for Indian Railways. The model name stands for broad gauge (W), alternating current (A), goods traffic (G) engine, 7th generation (7). They entered service in 1992. A total of 1970 WAG-7 were built at CLW and BHEL between 1990 and 2015, which made them the most numerous class of mainline electric locomotive till its successor the WAG-9.
Quick Facts WAG-7, Type and origin ...
WAG-7 |
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Specifications |
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Configuration:
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• UIC | Co′Co′ |
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Gauge | 5 ft 6 in (1,676 mm) |
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Bogies | ALCO Fabricated |
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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) |
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Wheelbase | 3.8 m (12 ft 5+5⁄8 in) |
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Length | 20.934 m (68 ft 8+1⁄8 in) |
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Width | 3.179 m (10 ft 5+1⁄8 in) |
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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] |
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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) |
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Loco weight | WAG-7 : 123 tonnes (121 long tons; 136 short tons) WAG-7H : 132 tonnes (130 long tons; 146 short tons) |
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Electric system/s | 25 kV 50 Hz AC Overhead |
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Current pickup(s) | pantograph |
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Traction motors | WAG-7 : Hitachi HS15250A WAG-7H : Hitachi HS15250G |
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MU working | 4 |
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Loco brake | Air, Hand and Rheostatic (Friction) |
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Train brakes | Air, Vacuum and Dual |
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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 |
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Performance figures |
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Maximum speed | 105 km/h (65 mph) |
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Power output | Max : 5,350 hp (3,990 kW) Continuous : 5,000 hp (3,730 kW) |
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Tractive effort | WAG-7 starting : 48 tons WAG-7 continuous : 45 tons? WAG-7H starting : 91 tons? |
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Factor of adh. | 0.345 |
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Career |
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Operators | Indian Railways |
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Numbers | WAG-7 : 27001-27999, 28000-28770, 24501-24700 WAG-7H : 28024 and 28739 |
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Nicknames | SHANTIDAN, EKTA, KARAMVIR, GAJRAJ, SWARNABHA, SARVOTTAM, SAMARPAN, CAUVERY, SAMRAT, PRAYAS & AGRASAR |
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Locale | All over India |
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Disposition | active |
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Close
The WAG-7 is one of the most successful locomotives of Indian Railways currently serving both freight and passenger trains for over 31 years. Even though with the advent of new 3-phase locomotives like WAG-9 and WAG-12, all WAG-7 locomotives except ones destroyed in accidents, are in service and doing all types of duties.