Indian locomotive class WDG-2/3A

WDG-3A
Ludhiana based WDG-3A at Jalandhar City.
Type and origin Power type Diesel Builder BLW, Diesel Loco Modernisation Works Model ALCO-251C/ALCO DL560C variant Build date 1994–2015 Total produced WDG-3A: 1,998 Rebuilder Diesel Loco Modernisation Works, Patiala
Specifications Configuration: ​  • UIC Co-Co Gauge 1,676 mm (5 ft 6 in) Bogies High adhesion Fabricated bogies Wheel diameter 1,092 mm (3 ft 7 in) Wheelbase 12.834 m (42 ft 1+1⁄4 in) Length 17.85 m (58 ft 6+3⁄4 in) Width 3.016 m (9 ft 10+3⁄4 in) Height 4.162 m (13 ft 7+7⁄8 in) Axle load 23,500 kg (51,800 lb) Loco weight 127 t (125 long tons; 140 short tons) Fuel type Diesel Fuel capacity 6,000 L (1,300 imp gal; 1,600 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 Loco brake air dynamic brake Train brakes Air, Vacuum and Dual
Performance figures Maximum speed 105 km/h (65 mph) Power output WDG-3A: 3,100 hp Tractive effort 37.90 t (37 long tons; 42 short tons) Factor of adh. 0.33
Career Operators Indian Railways Numbers 14501-14999, Newer 13000-13665 Nicknames Shakti, Prabal, Jai Jawan Locale throughout Indian Railways First run 1994 Retired Early 2020s–present Preserved 1[citation needed] Disposition In service

The Indian locomotive class WDG-3A is a class of diesel–electric locomotive that was developed in 1994 by Banaras Locomotive Works (BLW),Varanasi for Indian Railways. The model name stands for broad-gauge (W), Diesel (D), Goods traffic (G) engine, 3,100 hp (3A) locomotive. They entered service on 18 July 1995. A total of 1,164 WDG-3A units were built between 1994 and 2015 at BLW, Varanasi with a few units being produced by Diesel Loco Modernisation Works (DLMW) and Parel Workshop.

It is the dedicated freight version of the very successful WDM-2 and shares the same engine and horsepower rating with WDM-3A. It is considered to be a successful locomotive class with high reliability and few maintenance problems. Despite the introduction of more modern types of locomotives like WDG-4 and electrification, a significant number are still in use, both in mainline and departmental duties.

As of September 2023, 787 locomotives still retain "operational status" on the mainline as WDG-3A, with a few examples having been converted to WAGC-3 or WAG-10.