The Indian locomotive class WAP-6 was a class of 25 kV AC electric locomotives that was developed in the mid-1990s by Chittaranjan Locomotive Works for Indian Railways. The model name stands for broad gauge (W), AC Current (A), Passenger traffic (P) locomotive, 6th generation (6). They entered service in April 1996. A total of 17 WAP-6 units were built at CLW between 1995 and 1998.
The WAP-6 were intended to be a higher-speed variant of the WAP-4, but were restricted to a top speed of 105 km/h after failing trials. All were based at Asansol (ASN) shed, but after conversion to WAP-4 specifications, they were reallocated to Howrah (HWH) shed.
History This class was a regeared variant of the WAP-4 mounted on Fabricated Flexicoil Mark IV bogies, instead of the standard Co-Co Flexicoil Mark 1 cast bogies seen on other WAP-4 locomotives. All other specifications were same as WAP-4. WAP-1 no.22212 was the first to be rebuilt into a WAP-6, being fitted with Flexicoil bogies and other upgrades; it was later rebuilt into a WAP-4. Subsequently, 16 more WAP-1 units were re-geared and mounted on Flexicoil Mark IV high-adhesion bogies, which are similar to high-adhesion bogies made by ALCO. Renumbered to 22400–22416, they were intended for operations, but in trials, they were unable to reach that speed and were therefore restricted to . Two units, 22406 and 22408, were upgraded with better wheel-sets. This class was unsuccessful, with most locomotives of this series being converted back as WAP-4.
Technical specifications Technical specification Traction motors Axle-hung, nose-suspended, force-ventilated, , , 750 V, 900 A, 895 RPM, parallel grouping, C class armature and field, temperature rise (Armature 60, filed 70 and commutator 85) in °C, coil resistance (armature 0.01284 ohms+10%, field 0.01184 ohms+10% and commutator 0.00907 ohms+10%, air gap main pole 6.35 kVA, air gap inter-pole Gear ratio 58:23 Transformer CCL make, aluminium coil, 3400 kVA, 32 taps Rectifier 2 silicon rectifier cubicle 2700 A, 1050 V Number of sandboxes 4 2 Headlights 250 W, 32 V Lead acid Battery 50 cells, 110 V (rated 5 hr) Arno Converter 216 kVA 2 FLAKT smoothing reactor blower PHMX-40 2 Silicon Rectifier Blower Oil cooler blower S.F. India Ltd. Smoothing reactor for traction motor SL-30 type, 1350 A, 1270 V, 2 Coils, 0.00535 ohms resistance at
Hauling capacity If the average weight of ICF coaches is 55 tonnes then: Grades/km/h Start 20 40 60 70 80 90 100 110 120 130 140 150 160 Level 1500+ 1500+ 1500+ 1500+ 1500+ 1500+ 1500+ 1500+ 1500+ 1500+ 1500+ 1155 805 570 1 in 500 1500+ 1500+ 1500+ 1500+ 1500+ 1500+ 1500+ 1500+ 1500+ 1500+ 1105 805 565 400 1 in 200 1500+ 1500+ 1500+ 1500+ 1500+ 1500+ 1500+ 1320 1230 1035 730 535 375 260 1 in 150 1500+ 1500+ 1500+ 1500+ 1500+ 1500+ 1405 1090 1020 860 610 445 310 215 1 in 100 1500+ 1570 1490 1405 1365 1195 1020 795 750 635 445 320 220 145 1 in 50 1160 770 750 720 710 625 530 410 390 325 220 150 90 45
See also Indian Railways Locomotives of India Rail transport in India
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