Additional Electric Locomotive Specifications

Passenger AC electric loco comparison (WAP series)

See the freight and mixed loco list above as well. IR uses WAG and WAM series locos quite often for passenger trains.

Locomotive WAP-1 WAP-3 WAP-4 WAP-5 WAP-6
Traction Motor TAO659 TAO659 HS15250 6FXA7059 HS15250
HP 3900 3900 5000 6000 5000
Axle weight (t) 18.80 18.88 18.80 19.50 18.87
Total weight (t) 112 112 112 78 113
TE (continuous) 13.8 13.8 19.0 22.4 19.0
TE (starting) 22.4 22.4 30.8 26.3 --
Max. Speed 130 140 140 160 160

Freight & Mixed AC electric loco comparison (WAG/WAM series)

Locomotive WAG-1 WAG-4 WAM-4 WAG-5 WAG-7 WAG-9 WAG-9H
Bogie BB BB Co-Co Co-Co Co-Co Co-Co Co-Co
Traction motor MG1420 MG1580 TAO659 TAO659 HS15250 FRA6068/
HS15250
FRA6068
Gear Ratio 1:3.95 1:3.95 15:62 16:62 16:65 15:77/
18:64
15:77
HP 2900 3150 3400 3900 5000 6000 6000
TE (Start) (t) 30 30 30 33.5 41 47 52
TE (Cont.) (t) 23.7 23.2 17.6 20.6 27 32 32
Max. Speed 80 80 100 80 100 100 100
Axle Load (t) 21.3 21.9 18.8 20 20.5 30.5 22.5
Total Weight (t) 85.2 87.6 112.8 120 123 123 135
Haulage (t) 1820 2000 2010 2375 3010 4250 4700

Acknowledgement: Many thanks to Sujeet Mishra for supplying the freight locomotive data. The passenger loco data is from the Nov. 1997 issue of Indian Railways.

WCAM series AC-DC loco comparison

The Technical Specifications shown below for the WCAM series of locomotives have been compiled from manuals provided by Western and Central Railway. Other sources of information used have been mentioned explicitly below. Compilation by Prakash Tendulkar.

Locomotive WCAM-1 WCAM-2 WCAM-3
Brakes Only Vaccum* Dual, or only air** Dual, or only air
Max. Speed 100 km/h 120 km/h 105 km/h
Max. Speed, DC mode 80 km/h 105 km/h 105 km/h
Traction Motors TAO 659 TAO 659 HS15250A
HP 3640(AC)
2930(DC)****
3780(Cont.)
4950(Start - 2 motors)***
5000(AC)
4600(DC)
Transformer 3800kVA 5400kVA 5400kVA
Bogie Co-Co casting Co-Co fabricated
with secondary suspension
Co-Co fabricated
with secondary suspension
Gear Ratio 16:61 & 21:58 15:62 & 21:58 18:64
Motor Combinations(AC) 3S-2P, 2S-3P 2S-3P 2S-3P
Motor Combinations(DC) 6S, 3S-2P 6S, 3S-2P 6S, 3S-2P, 2S-3P
DC Series notches 1 - 21 1 - 22 1 - 22
DC Series-Parallel notches 22 - 30 23 - 32 23 - 32
DC Parallel notches n/a n/a 33 - 39
Weak Field operation(DC) 21st and 30th notches 22nd and 32nd notches 22nd, 32nd, 39th notches
MU Operation No Yes, up to 3 locos Yes
Starting Effort(AC) 30t 33.5t 41t
Starting Effort(DC) 28t 26t 26t
Loco Length 20.98m 20.98m 20.98m

Notes:

WCAG1 is a derivative of WCAM3. All specifications are identical, except Gear Ratio of 16:65, and Starting Effort 43.56t in AC and 29.66t in DC mode.

  1. * : WCAM-1 # 805, 807, 812, 828, 838, 844, 845 and 850 are dual-brake models.
  2. ** : Some WCAM-2P are air-brake-only models.
  3. *** : Based on 750V DC 840A continuous, 1100A starting, with 2 motors. Manual did not provide separate figures for AC and DC operation.
  4. Figures from "Diesel and Electric Locomotives of Indian Railways" by Jal E Daboo, published by the British Overseas Railways Historical Trust (BORHT). (See the section on books for more information.)

Locomotive Acceleration Capabilities

Sujeet Mishra has kindly provided some data from acceleration studies conducted by Indian Railways on locos of different kinds hauling standard passenger rakes.

All trials conducted with a 24-coach 1430 tonne passenger rake
Locomotive0-110km/h time (sec)Distance (km)0-120km/h time (sec)Distance (km)0-130km/h time (sec)Distance (km)
WDP4102025.66Not possibleN/ANot possibleN/A
WAP4338.36.8545510.54741.320.53
WAP5312.15.981402.76.884556.214.24
WAP7240.44.654303.56.674393.89.82
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