Indian locomotive class WAP-7

WAP-7
CLW made WAP-7 at CLW yard.
Type and origin Power type Electric Builder Chittaranjan Locomotive Works, Banaras Locomotive Works, Patiala Locomotive Works Build date 1999 - present Total produced 1695 as of June 2024
Specifications Gauge 5 ft 6 in (1,676 mm) Bogies Co-Co, Fabricated Flexicoil Mark IV bogies; bogie wheelbase 1,850 mm (72+7⁄8 in) + 1,850 mm (72+7⁄8 in) Wheel diameter 1,092 mm (43 in) new, 1,016 mm (40 in) worn Wheelbase 15,700 mm (51 ft 6+1⁄8 in) Length: ​  • Over beams 20,562 mm (67 ft 5+1⁄2 in) Width 3,152 mm (10 ft 4+1⁄8 in) Height: ​  • Pantograph 4,255 mm (13 ft 11+1⁄2 in) Axle load WAP 7 20.5 t (20.2 long tons; 22.6 short tons)[1] WAP 7HS 18.08 t (17.79 long tons; 19.93 short tons)[2] Loco weight 123 t (121 long tons; 136 short tons)[3] Power supply 3-phase 2180 V 50 Hz Electric system/s 25 kV 50 Hz AC Overhead Current pickup(s) Pantograph Traction motors 6FRA 6068 3-phase squirrel-cage induction motors 850 kW (1,140 hp), 2180 V, 1283/2484 rpm, 270/310A; Weight-2,100 kg (4,600 lb), forced-air ventilation, axle-hung, nose-suspended; Torque 6,330–7,140 N⋅m (4,670–5,270 lbf⋅ft) ~88% efficiency. Transmission Electric Gear ratio WAP 7 72:20 WAP 7HS 70:22 Loco brake Air and regenerative Train brakes Air
Performance figures Maximum speed 140 km/h (87 mph) (WAP-7) 160 km/h (99 mph) (WAP-7HS) Potential speed: 180 km/h (110 mph) (WAP-7HS) 155 km/h (96 mph) (WAP-7) Power output Max Power : 6,350 hp (4,740 kW) Continuous: 6,120 hp (4,563.68 kW) Tractive effort Starting : 322.4 kN (72,500 lbf) Continuous : 228 kN (51,000 lbf) at 71 km/h
Career Operators Indian Railways Numbers 30201+ CLW 37001+ BLW 39000+ PLW Locale All over India First run 19 May 2000

The Indian locomotive class WAP-7 is a class of 25 kV AC electric locomotives that was developed in 1999 by Chittaranjan Locomotive Works (CLW) for Indian Railways. The model name stands for broad gauge (W), AC Current (A), Passenger traffic (P) locomotive, 7th generation (7). They entered service in 2000. A total of 1676 WAP-7 have been built, with more units being built at CLW, Banaras Locomotive Works (BLW) and Patiala Locomotive Works (PLW).

The WAP-7 is the most successful locomotives of Indian Railways serving passenger trains for over 23 years. It is a passenger variant of the WAG-9 freight locomotive with a modified gear ratio to pull lighter loads at higher speeds. With an output of 6125HP, it is the most powerful passenger locomotive in the Indian Railways fleet, and the most numerous passenger locomotive in India. The WAP-7 is capable of hauling 24 coach trains at speeds 110–140 km/h (68–87 mph).