Indian locomotive class WCAM-2

WCAM-2 is a class of locomotives used in the Indian Railways system. They are the second locomotive from the WCAM class. The model name stands for broad gauge (W), DC Current (C), AC Current (A), Mixed traffic (M) locomotive, 2nd generation (2). They use the same motors as WCAM 1 but with different circuitry and gearing. They are operational in routes around Mumbai. MU operation was possible with 3 units. WCAM-2P was the passenger-oriented version of the WCAM-2 class. However, they perform better than the WCAM 1 series. Same as WCAM 1 class they also performed poorly in DC mode compared to AC mode. They were also used for hauling trains away from the DC section of suburban trains to AC section and performed the same task as the WCAM-1 did. WCAM-2 locos had the same traction motors, as the WCAM-1 locos, but different circuitry and gearing. The bogies are somewhat different from those of the WCAM-1 being fabricated trimount Co-Co bogies with secondary suspension. Rated speed 105 km/h in DC mode and 120 km/h in AC mode. (In trials by RDSO the loco is said to had been run at speeds up to 135 km/h in AC mode). Almost all of these were dual-braked, but all are now equipped with air brakes only. All the WCAM-1's and -2's were homed at Valsad shed in Gujarat. Many of CR's WCAM-2 locos were not used much in DC zones (exceptions were the CR / Bombay Port Trust's Wadala marshalling yard a portion of which has DC traction, and for hauling the Punjab Mail in the late 1990s) as they delivered very poor performance in DC mode and on CR's heavy grades. Although these locos have the same traction motors as the WAM 4 and WCAM 1, the power output from the WCAM-2 locos is higher than for the WAM-4 and WCAM-1 because in those models the traction motors were underfed (3460kVA transformer in contrast to the 5400kVA transformer for WCAM-2) and did not yield their potential maximum power. Under AC traction, the WCAM-2 locos operate with all six motors in parallel (this has been enforced by modifications to these locos), while in DC mode they also operate in the all-series and series-parallel (2S 3P, i.e., three series-pairs of motors in parallel) configurations. Recent WCAM-2's from BHEL, including the passenger-specific version WCAM-2P, were rated 2900 hp in DC mode and 4700 hp in AC mode (max. speed 120 km/h in AC mode). These were used by WR and CR for fast trains, running at up to 120 km/h. CR had tried the WCAM-2 and WCAM-2P units but found them usable only with speed restrictions. Some WCAM-2P units had only air brakes. With the WCAM-2 locos, MU operation was possible with up to 3 (4?) units. Some (all?) of the WCAM-2 locos were originally leased to IR, ownership remaining with BHEL, the manufacturers.

WCAM-2
A Kalyan based WCAM-2 twins running light
Type and origin
Power typeElectric
BuilderBharat Heavy Electricals Limited
Total producedWCAM-2: 20
Specifications
Configuration:
​
 • UICCo'Co'
Gauge5 ft 6 in (1,676 mm)
Electric system/s25 kV 50 Hz AC AC
1.5 kV DC
Current pickup(s)Pantographs one each for AC and DC (past) (now both pantographs are AC collectors)
Performance figures
Maximum speed80–100 km/h (50–62 mph) DC, 120 km/h (75 mph) AC, Test run 135 km/h (84 mph)
Power output3,780 hp (2,820 kW) DC
4,720 hp (3,520 kW) AC Continuous
4,950 hp (3,690 kW) Starting
Tractive effort26,000 kgf (250,000 N; 57,000 lbf) DC
33,400 kgf (328,000 N; 74,000 lbf) AC
Career
OperatorsIndian Railways
NumbersStarting from 21861 to 21880
NicknamesBalwant for No.-21861
LocaleCentral Railways
(Former Western Railways)
WCAM 2P engine at Vadodara Junction

Technical specifications[1]
Manufacturers Bharat Heavy Electricals Limited
Traction Motors TAO 659 (575 kW (771 hp), 750 V). Axle-hung, nose-suspended, force-ventilated.
Gear Ratio 62:15, 58:21
Transformer BHEL 5400 kVA.
Rectifiers Two silicon rectifier units D1800N44 (Siemens), 16 cells per bridge. 1000 V / 3600 A
Axle load 18.8 t (18.5 long tons; 20.7 short tons)
Bogies Co-Co trimount fabricated bogies with secondary suspension.
Pantographs Stone India AM-12 (AC) and Stone India AM-18B (DC) (past)
Notches Total 32
Weight 113 t (111 long tons; 125 short tons)
Length 20,950 mm (68 ft 8 3⁄4 in)
Total wheelbase 15,698 mm (51 ft 6 in)
Brakes Vacuum (past) and/or Air

Locomotive shed
ZoneNameShed CodeQuantity
Central RailwayKalyanKYN20
Total Locomotives Active as of 01-07-2020[2]20

Trains hauled by WCAM-2/2P
  1. Pragati Express
  2. Sahyadri Express
  3. Jhelum Express
  4. Kanyakumari Mumbai Express

See also

References
  1. WCAM-2 at Indian Railways Fan Club
  2. "e-Locos".
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