WDM 3A
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| Type and origin | |
|---|---|
| Power type | Diesel |
| Builder | Alco, DLW |
| Model | ALCO-251C |
| Build date | August 22, 1993 onwards |
| Total produced | WDM-3A : 1296 as of December 2015 WDM-3D : 510 as of December 2015 WDG-3A : 1145 as of December 2015 |
| Specifications | |
|---|---|
| UIC class | Co-Co |
| Gauge | 1,676 mm (5 ft 6 in) |
| Bogies | ALCO Asymmetric cast frame trimount |
| Wheel diameter | 1,092 mm (3 ft 7 in) |
| Wheelbase | 12.834 m (42 ft 1 1⁄4 in) |
| Length | 17.12 m (56 ft 2 in) |
| Width | 2.864 m (9 ft 4 3⁄4 in) |
| Height | 4.185 m (13 ft 8 3⁄4 in) |
| Axle load | 18,800 kg (41,400 lb) |
| Loco weight | 123,000 kg (271,000 lb) |
| Fuel type | Diesel |
| Fuel capacity | 5,000 L (1,100 imp gal; 1,300 US gal) |
| Prime mover | ALCO 251-C |
| RPM range | 400 - 1050 rpm |
| Engine type | V16 Diesel engine |
| Aspiration | ABB VTC304-15 or Napier NA 295 IR turbocharger |
| Traction motors | BHEL TA 10102 CW (new), BHEL TG 10931 AZ(old) |
| Cylinders | 16 |
| Cylinder size | 228 mm × 266 mm (8.98 in × 10.47 in) bore x stroke |
| Transmission | Diesel electric |
| MU working | 2 |
| Train brakes | Air, Vacuum and Dual |
| Performance figures | |
|---|---|
| Maximum speed | 120 km/h (75 mph) |
| Power output | WDM-3A: 3100 HP, WDM-3D: 3300 HP, WDM-3E: 3500 HP, 3600 HP. |
| Tractive effort | 30.45 t (30 long tons; 34 short tons) |
| Factor of adh. | 0.27 |
| Career | |
|---|---|
| Operators | Indian Railways |
| Numbers | 14001-14079, 14080-14143 |
| Nicknames | Cheetah, Prabal, Velociti, Awadh, Firex, Sher Punjab, Veer |
| Locale | All over Indian Railways |
| Preserved | 1 |
| Disposition | active |
The class WDM-3A is Indian Railways' workhorse diesel locomotive. Since 1993, it has been manufactured in India by the Diesel Locomotive Works (DLW), Varanasi. The model name stands for broad gauge (W), diesel (D), mixed traffic (M) engine. The WDM-3A is the most common diesel locomotive of Indian Railways. The WDM-3A is a variant of the original WDM-2C. These units have been retro-fitted with dual brakes, in addition to the air and vacuum brakes. The WDM-3A locos have a maximum speed of 120 km/h (75 mph). The gear ratio is 65:18.
The loco is now widely used across India for long distance passenger trains due to its ruggedness and high tractive loads and acceleration.
The first one was delivered on August 22, 1994, It was then WDM-2C. More than 150 locos were produced till 1998.
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Wikipedia