| Indian locomotive class WDM-7 |
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WDM-7 #11008 hauling a freight train; this loco is fuelled by bio-diesel |
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| Specifications |
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Configuration:
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| • UIC | Co′Co′ |
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| • Commonwealth | Co-Co |
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| Gauge | 1,676 mm (5 ft 6 in) |
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| Bogies | ALCO Asymmetric cast frame trimount |
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| Wheel diameter | 1,092 mm (3 ft 7 in) |
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| Wheelbase | 12.834 m (42 ft 1+1⁄4 in) |
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| Length | 17.12 m (56 ft 2 in) |
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| Width | 2.864 m (9 ft 4+3⁄4 in) |
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| Height | 4.185 m (13 ft 8+3⁄4 in) |
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| Axle load | 17,800 kg (39,200 lb) |
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| Loco weight | 96,000 kg (212,000 lb) |
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| Fuel type | diesel |
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| Fuel capacity | 5,000 L (1,100 imp gal; 1,300 US gal) |
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| Prime mover | ALCO 251-B |
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| RPM range | 400–1000 rpm |
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| Engine type | V12 diesel |
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| Traction motors | BHEL 4906 BZ and 4907 AZ |
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| Cylinders | 12 |
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| Cylinder size | 228 mm × 266 mm (8.98 in × 10.47 in)
bore×stroke |
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| Transmission | Diesel–electric transmission |
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| MU working | 2 units |
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| Train brakes | Air, Vacuum and Dual |
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| Performance figures |
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| Maximum speed | 105 km/h (65 mph) |
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| Power output | Max: 2,000 hp (1,500 kW)
Site rated: 1,800 hp (1,300 kW) |
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| Tractive effort | 25.3 t (25 long tons; 28 short tons) |
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The WDM-7 is a diesel–electric locomotive of Indian Railways. It has been manufactured by Banaras Locomotive Works (BLW), Varanasi. The model name stands for broad gauge (W), diesel (D), mixed traffic (M) engine. Today, these are found exclusively at Chennai Central and nearby area.
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), restricted to 100 km/h (62 mph) when run long hood forward - the gear ratio is 94:17.
