Indian locomotive class WDP-1

The Indian locomotive class WDP-1 is a class of diesel–electric locomotive that was developed in 1995 by Banaras Locomotive Works (BLW) for Indian Railways. The model name stands for broad gauge (W), Diesel (D), Passenger traffic (P) engine, 1st generation (1). They entered service in 1995. A total of 69 WDP-1 units were built at Banaras Locomotive Works (BLW), Varanasi between 1995 and 1999.

WDP-1
BZA based WDP-1 hauling Shesadri express arrived Samalkot Jn.
Type and origin Power type Diesel Builder BLW Model DL560C Build date 1995–1999 Total produced WDP-1: 69
Specifications Configuration: ​  • UIC Bo′Bo′  • Commonwealth Bo-Bo Gauge 1,676 mm (5 ft 6 in) Bogies Bo-Bo fabricated bogies loosely based on the Flexicoil models Wheel diameter 1,092 mm (3 ft 7 in) Wheelbase 12.834 m (42 ft 1+1⁄4 in) Length 14.810 m (48 ft 7+1⁄8 in) Width 2.95 m (9 ft 8+1⁄8 in) Height 4.077 m (13 ft 4+1⁄2 in) Axle load 20,000 kg (44,000 lb) Loco weight 80,100 kg (176,600 lb) Fuel type Diesel Fuel capacity 5,000 L (1,100 imp gal; 1,300 US gal) Prime mover ALCO 251-C RPM range 390rpm-400rpm idling, 1000rpm at 8th notch Engine type V12 diesel Aspiration Turbo-supercharged Traction motors BHEL 5002AZ CGL 7362A Cylinders 12 Cylinder size 228 mm × 266 mm (8.98 in × 10.47 in) bore x stroke Transmission Diesel–electric MU working 2 Train brakes Air and Dual
Performance figures Maximum speed 140 km/h (87 mph) Power output Max:2,300 hp (1,700 kW) Site rated:2,000 hp (1,500 kW) Tractive effort 20 t (20 long tons; 22 short tons)
Career Operators Indian Railways Numbers 15001-15069 Locale All over Indian Railways Disposition active

Despite the introduction of more modern types of locomotives such as the WDG-4, and electrification, a significant number are still in use, both in mainline and departmental duties. As of November 2024, 7 locomotives still retain "operational status" on the mainline.

History

The WDP-1 is a lower powered version of the WDM-2. These locos have a 2300 hp powerpack, . The engine is a converted version of the Alco 251C model with a 12-cylinder engine and low overall weight with a max. speed of 140 km/h, Bo-Bo fabricated bogies loosely based on the Flexicoil models. They are still in service and are homed either at TKD & BZA to haul short commuter trains and shunting around the area. They look just like all other ALCOs and are easily identified by the laterally “sculpted” and baldie grille-less short hood.

WDP1M is a rebuilt version with better powerpack and better cooling via a modified radiator. The biggest change is in the suspension. Rubber springs have been provided instead of coil springs, along with other changes to the suspension and axle components.

The scrapping of these locomotives has begun. All WDP-1 locomotives of BZA DLS were condemned in February 2023 and scrapped at DLS.

Locomotive sheds

Zone	Name	Shed Code	Quantity
Northern Railway	Tughlakabad	TKD (D)	7
Total Locomotives Active as of March 2025[1]			7

Former sheds

Zone	Name	Shed Code
South Central Railway	Kazipet	KZJ
	Vijayawada	BZA
North Eastern Railway	Izzatnagar	IZN

See also

• Indian locomotive class WDM-2
• List of diesel locomotives of India
• Rail transport in India#History
• Rail transport in India