Indian locomotive class WDM-7

The class WDM-7 is a diesel-electric locomotive of Indian Railways. It has been manufactured by Diesel Locomotive Works (DLW), Varanasi. The model name stands for broad gauge (W), diesel (D), mixed traffic (M) engine. The WDM-7 are found exclusively at Chennai Central and nearby area.

Indian locomotive class WDM-7
WDM-7 hauling a freight, the loco is running on bio-diesel
Type and origin
Power typediesel
BuilderDLW
ModelDL560C
Build date1987- 1989
Total produced15
Specifications
Configuration:
​
 • UICCo′Co′
 • CommonwealthCo-Co
Gauge1,676 mm (5 ft 6 in)
BogiesALCO Asymmetric cast frame trimount
Wheel diameter1,092 mm (3 ft 7 in)
Wheelbase12.834 m (42 ft 1 1⁄4 in)
Length17.12 m (56 ft 2 in)
Width2.864 m (9 ft 4 3⁄4 in)
Height4.185 m (13 ft 8 3⁄4 in)
Axle load17,800 kg (39,200 lb)
Loco weight96,000 kg (212,000 lb)
Fuel typediesel
Fuel capacity5,000 L (1,100 imp gal; 1,300 US gal)
Prime moverALCO 251-B
RPM range400–1000 rpm
Engine typeV12 diesel
Traction motorsBHEL 4906 BZ and 4907 AZ
Cylinders12
Cylinder size228 mm × 266 mm (8.98 in × 10.47 in)
bore×stroke
TransmissionDiesel-electric transmission
MU working2 units[1]
Train brakesAir, Vacuum and Dual
Performance figures
Maximum speed105 km/h (65 mph)
Power outputMax:2,000 hp (1,500 kW)
Site rated:1,800 hp (1,300 kW)
Tractive effort25.3 t (25 long tons; 28 short tons)
Career
OperatorsIndian Railways
Numbers11001-11015
LocaleSR
Dispositionactive

These units have been retro-fitted with air brakes, in addition to the original vacuum brakes. The WDM-7 locos have a maximum speed of 105 km/h (65 mph),[2] restricted to 100 km/h (62 mph) when run long hood forward - the gear ratio is 94:17.

TNP WDM-7 resting in siding

History

These locos were built from 1987 to 1989. A few were at Ernakulam earlier but later all were transferred to Tondiarpet seen being used as shunters at Chennai Central or for light passenger haulage. Some are at the thermal power station, Chennai.

These Co-Co diesel-electrics were designed for branch-line duties (top speed 105 km/h). They have two 3-axle bogies and are similar to the WDM-2 in appearance. The power-pack is a 12-cylinder Alco 251B unit. They are lower powered version of the WDM-2. They were formerly housed at Erode and Golden Rock also. They are reliable and rugged locomotives even though low powered. They can be easily recognised by the lack of grilles on the short hood. Two locos are running on a mixture of bio-diesel and diesel. All 15 are still in service.

Locomotive shed
ZoneNmaeShed CodeQuantity
Southern RailwayTondiarpetTNP15
Total Locomotives Active as of July 2020[3]15

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See also

References

Notes
  1. https://www.irfca.org/gallery/Locos/Diesel/wdm1_4_5_6_7/WDM7_twins.jpg.html?
  2. Sheeju Chandran. "Interactive Diagram of the WDM-2 Locomotive". Indian Railways Fan Club.
  3. "IRFCA".

Bibliography
  • Hughes, Hugh (1996). Indian Locomotives: Part 4 – 1941–1990. Harrow, Middlesex: The Continental Railway Circle. ISBN 0-9521655-1-1.
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