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The Indian locomotive class WAP-6 is 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), 6th generation (6) locomotive. They entered service in April 1996. A total of 17 WAP-6 units were built at CLW between 1995 and 1998.

WAP-6[1]
A Former WAP-6 hauling Kaziranga Express
Type and origin Power type Electric Builder CLW Build date 1995-1998 Total produced 17 Rebuild date August, 2012 Number rebuilt 22401-22416
Specifications Configuration: ​  • UIC Co'-Co' Gauge 1,676 mm (5 ft 6 in) Bogies originally Flexicoil Mark IV Fabricated;converted to Co'-Co' Flexicoil Mark 1 cast bogies; primary and secondary wheel springs with bolsters Wheel diameter New: 1,092 mm (3 ft 7 in) Half worn: 1,055 mm (3 ft 5+1⁄2 in) Full worn: 1,016 mm (3 ft 4 in) Length 18.79 m (61 ft 7+3⁄4 in) Height 4.235 m (13 ft 10+3⁄4 in) Axle load 18,800 kg (41,400 lb) Loco weight 113,200 kg (249,600 lb) Electric system/s 25 kV 50 Hz AC, AC Overhead Current pickup(s) pantograph Traction motors Hitachi HS15250 Loco brake Air/Hand Train brakes Air Safety systems Slip control, Over voltage relay and No volt relay
Performance figures Maximum speed Intended at 140 km/h (87 mph); Restricted:105 km/h (65 mph) Power output Max: 5,350 hp (3,990 kW) Continuous: 5,000 hp (3,700 kW) Tractive effort Starting:30.8 t (30 long tons; 34 short tons) Continuous:19 t (19 long tons; 21 short tons)
Career Operators Indian Railways Numbers 22400-22416 Locale Eastern Railway Withdrawn August, 2012/In service as WAP-4 Disposition One scrapped remainder rebuilt

The WAP-6 were intended to be the faster variant of the successful WAP-4, but failed trials and were restricted to a top speed of 105km/h. Now all units have been converted to WAP-4 specifications. All were homed at Asansol (ASN) shed but after conversion reallocated to Howrah (HWH) shed.

History

This class was actually variant of the WAP-4 design where Co-Co Flexicoil Mark 1 cast bogies of the usual WAP4 was replaced by Fabricated Flexicoil Mark IV bogies. All other specifications were same as WAP4. WAP-1 unit no. 22212 was the first to be rebuilt into a WAP-6. It was provided with Flexicoil bogies and other upgrades. Then it was rebuilt into WAP-4. Later, more WAP-1 units were re-geared and provided with high-adhesion fabricated bogies (Flexicoil Mark IV) which are somewhat similar to ALCO hi-adhesion bogies. They were intended to reach 140 km/h (87 mph) but failed to do so in trials and were restricted at 105 km/h (65 mph). Two units,i.e., 22406 and 22408 are upgraded with better wheel-sets. This class was an unsuccessful one. All have been converted back as WAP-4. About 16 of these were built (All in the number series 22400-22416.).[2]

Technical specifications

Technical specification[3]
Traction motors	Axle-hung, nose-suspended, force-ventilated, 3,485 kg (7,683 lb), 630 kW (840 hp), 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 10 mm (0.3937 in)
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	60 kg (132 lb)
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 110 °C (230 °F)

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

* Except One all the locomotives are rebuild back to wap-4.

See also

• Indian Railways
• Locomotives of India
• Rail transport in India

References

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