Indian locomotive class YDM-4

The class YDM-4 is Indian Railways' workhorse diesel locomotive. The first units were imported fully built from the American Locomotive Company (Alco) in 1961. Since 1968, it has been manufactured in India by the Banaras Locomotive Works (BLW), Varanasi. The model name stands for metre gauge (Y), diesel (D), mixed traffic (M) engine. The YDM-4 has been the most successful diesel locomotive in the metre gauge operation of Indian Railways. The YDM-4A is a variant of the YDM-4 supplied by MLW . Originally equipped with vacuum brakes. Some were later equipped with dual brakes, particularly those working in the Northeast Frontier Railway were retrofitted with dual brake system by Lumding shed. The YDM-4 locos have a maximum speed of 100 km/h (62 mph), restricted to 85 km/h (53 mph).

YDM-4
Sabarmati based YDM-4 at Talala Jn.
Type and origin
Power typeDiesel
BuilderAlco, MLW, BLW
ModelDL535, DL535A, RSD-30, D13E.
Build date1961-1993
Total producedYDM-4: 695
Specifications
Configuration:
​
 • UICCo-Co
Gauge1,000 mm (3 ft 3+3⁄8 in) metre gauge
BogiesALCO Asymmetric cast frame trimount
Wheel diameter965 mm (37.99 in)
Length15.60 m (51 ft 2+1⁄8 in)
Width2,730 mm (8 ft 11+1⁄2 in)
Height3,635 mm (11 ft 11+1⁄8 in)
Axle load12,000 kg (26,000 lb)
Loco weight72,000 kg (159,000 lb) ALCo/DLW, 67,000 kg (148,000 lb) MLW
Fuel typeDiesel
Fuel capacity3,000 L (660 imp gal; 790 US gal)
Lubricant cap.530 L (120 imp gal; 140 US gal), 630 L (140 imp gal; 170 US gal) DLW
Water cap.22 L (4.8 imp gal; 5.8 US gal), 28 L (6.2 imp gal; 7.4 US gal) DLW
Prime moverALCO 251-D
RPM range400-1100
Engine typeInline-6 diesel
AspirationTurbo-supercharged
Displacement(?)
GeneratorDC
Traction motors6 DC
Cylinders6
Cylinder size228 mm × 267 mm (8.98 in × 10.51 in) bore x stroke
TransmissionDiesel-electric transmission
MU working2
Loco brake28LV-1, Air brake for Locomotive using SA-9 brake handle
Train brakesOriginally Vacuum using A-9 brake handle, some modified to Dual
Performance figures
Maximum speed96 km/h (60 mph)
Power outputMax:1,400 hp (1,000 kW)
Site rated:1,300 hp (970 kW)
Tractive effort18.935 t (19 long tons; 21 short tons) maximum 16.050 t (16 long tons; 18 short tons) continuous
Career
OperatorsIndian Railways, IRCON, KTMB Malaysia, Myanmar Railways, Vietnam Railways, Royal Railways, Mozambique Ports and Railways
Numbers6020-6049 ALCo, 6105-6129 ALCo, 6130- 6198 MLW, 6199-6258 DLW, 6259-6288 MLW, 6289-6769 DLW
LocaleAll over Indian Railways, Leased to KTMB Malaysia, Leased to Myanmar Railway, 25 units operate by Vietnam Railways
Preserved3
Current ownerIndian Railway, IRCON, KTMB Malaysia, Myanmar Railway, Vietnam Railways
Dispositionactive
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