| WDM-3D |
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Ernakulam based WDM-3D roaming light near Ernakulam Jn. |
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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 | HAHS Bogie (with OR without equaliser) |
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| Wheel diameter | 1,092 mm (3 ft 7 in) |
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| Wheelbase | 1,900 mm (6 ft 3 in) |
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| Pivot centres | 11,450 mm (37 ft 7 in) |
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Length:
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| • Over couplers | 18,632 mm (61 ft 2 in) |
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| • Over beams | 17,350 mm (56 ft 11 in) |
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| Width | 2,950 mm (9 ft 8 in) |
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| Height | 4,340 mm (14 ft 3 in) |
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| Axle load | 19.5 t (19,500 kg) |
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| Loco weight | 117 t (117,000 kg) |
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| Fuel type | Diesel |
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| Fuel capacity | 6,000 L (1,300 imp gal; 1,600 US gal) |
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| Lubricant cap. | 1,270 L (280 imp gal; 340 US gal) |
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| Coolant cap. | 1,210 L (270 imp gal; 320 US gal) |
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| Sandbox cap. | 160 L (35 imp gal; 42 US gal) |
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| Prime mover | ALCO 251-B (BLW Uprated) |
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| RPM range | 350/400–1050 rpm |
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| Engine type | V16 Four-stroke diesel engine |
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| Aspiration | GE 7S1716 Turbo-Supercharged |
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| Displacement | 175.14 L (38.53 imp gal; 46.27 US gal) |
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| Alternator | BHEL TA10102EV |
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| Generator | BHEL AG3101AY-1 |
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| Traction motors | BHEL TM5002BY |
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| • Rating 1 hour | 950 amps |
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| • Continuous | 925 amps |
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| Cylinders | 16 |
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| Cylinder size | 228.6 mm × 266.7 mm (9.00 in × 10.50 in)
bore x stroke |
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| Transmission | Diesel–electric Microprocessor based AC-DC transmission |
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| Gear ratio | 18:65 |
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| MU working | 2 |
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| Loco brake | Air Brake, Dynamic Brake, Hand Brake |
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| Train brakes | Air Brake |
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| Compressor | 2,266 L/min (@ 400 rpm), 5,665 L/min (@ 1000 rpm) |
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| Performance figures |
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| Maximum speed | 120 km/h (75 mph)
145 km/h (90 mph) (Tested Speed) |
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| Power output | Max:3,300 hp (2,500 kW)
Site rated:3,152 hp (2,350 kW) |
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| Tractive effort | 38.61 tf (378.6 kN) @ 33% adhesion |
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| Factor of adh. | 3.23 |
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| Dynamic brake peak effort | 17.94 tf (175.9 kN) |
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The Indian locomotive class WDM-3D is a class of diesel–electric locomotive that was developed in 2003 by Banaras Locomotive Works (BLW), Varanasi for Indian Railways. The model name stands for broad gauge (W), Diesel (D), Mixed traffic (M) engine with 3300 horsepower (3D). The engine is classified WDM-3D though it outputs only 3300 hp and not 3400 hp as the name should suggest. They entered service in 2003. A total of 590+ WDM-3D were built at Banaras Locomotive Works (BLW), Varanasi between 2003 and 2016.
The WDM-3D is one of the most successful locomotives of Indian Railways serving both passenger and freight trains. A few WDM-3D units were exported or gifted to neighboring countries like Sri Lanka and Bangladesh. A significant number of these locomotives are still in use, both on mainline and departmental duties. As of October 2021, most of the locomotives still retain "operational status" on the mainline as WDM-3D, with further examples having been converted from WDM-3B.
