| WAP-7 |
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Vijayawada based WAP-7 at BZA ELS. |
| Type and origin |
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| Power type | Electric |
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| Builder |
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| Build date | 1999–2023 (CLW)
2016–present (BLW)
2017–present (PLW) |
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| Total produced | 1959 as of June 2025 |
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| Specifications |
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| Gauge | 5 ft 6 in (1,676 mm) |
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| Bogies | Co-Co, Fabricated Flexicoil Mark IV bogies; bogie wheelbase 1,850 mm (72+7⁄8 in) + 1,850 mm (72+7⁄8 in) |
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| Wheel diameter | 1,092 mm (43 in) new, 1,016 mm (40 in) worn |
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| Wheelbase | 15,700 mm (51 ft 6+1⁄8 in) |
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Length:
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| • Over beams | 20,562 mm (67 ft 5+1⁄2 in) |
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| Width | 3,152 mm (10 ft 4+1⁄8 in) |
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Height:
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| • Pantograph | 4,255 mm (13 ft 11+1⁄2 in) |
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| Axle load | WAP 7
20.5 t (20.2 long tons; 22.6 short tons)
WAP 7HS
18.08 t (17.79 long tons; 19.93 short tons) |
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| Loco weight | 123 t (121 long tons; 136 short tons) |
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| Power supply | 3-phase 2180 V 50 Hz |
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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 | 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. |
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| Transmission | Electric |
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| Gear ratio | WAP 7
72:20
WAP 7HS
70:22 |
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| Loco brake | Air and regenerative |
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| Train brakes | Air |
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| Performance figures |
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| 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) |
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| Power output | Max Power : 6,350 hp (4,740 kW)
Continuous: 6,120 hp (4,563.68 kW) |
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| Tractive effort | Starting: 322.4 kN (72,500 lbf)
Continuous: 228 kN (51,000 lbf) at 71 km/h |
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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 1909 WAP-7 have been built, with more units being built at CLW, Banaras Locomotive Works (BLW) and Patiala Locomotive Works (PLW).
The WAP-7 has been serving passengers for Indian Railways since their introduction in 1999. 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 6,125 hp, 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). It also capable of hauling 26 coaches trains at speeds of 130 km/h.
