Indian locomotive class WDM-7

Indian locomotive class WDM-7
WDM-7 #11008 hauling a freight train; this loco is fuelled by bio-diesel
Type and origin Power type Diesel Builder Banaras Locomotive Works Order number 11709-11290 Serial number 21790 Model DL560C Build date 1987-1989 Total produced 15
Specifications Configuration: ​  • UIC Co′Co′  • Commonwealth 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 17,800 kg (39,200 lb) Loco weight 96,000 kg (212,000 lb) Fuel type diesel Fuel capacity 5,000 L (1,100 imp gal; 1,300 US gal) Prime mover ALCO 251-B RPM range 400–1000 rpm Engine type V12 diesel Traction motors BHEL 4906 BZ and 4907 AZ Cylinders 12 Cylinder size 228 mm × 266 mm (8.98 in × 10.47 in) bore×stroke Transmission Diesel-electric transmission MU working 2 units[1] Train brakes Air, Vacuum and Dual
Performance figures Maximum speed 105 km/h (65 mph) Power output Max: 2,000 hp (1,500 kW) Site rated: 1,800 hp (1,300 kW) Tractive effort 25.3 t (25 long tons; 28 short tons)
Career Operators Indian Railways Numbers 11001-11015 Locale Southern Railway Disposition Active

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),^[2] restricted to 100 km/h (62 mph) when run long hood forward - the gear ratio is 94:17.