TheYDM-4 is a class of diesel locomotives operating on Indian Railways. The first units were built by the American Locomotive Company (Alco) in 1961. Since 1968, members of the class have 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 metre gauge diesel locomotive in India. The YDM-4 locos have a maximum speed of 100 km/h (62 mph),[1] restricted to 85 km/h (53 mph).[2]
Quick Facts YDM-4, Type and origin ...
YDM-4 |
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Sabarmati based YDM-4 at Talala Jn. |
Type and origin |
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Power type | Diesel |
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Builder | Alco, MLW, BLW |
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Model | DL535, DL535A, RSD-30, D13E. |
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Build date | 1961-1993 |
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Total produced | YDM-4: 695 |
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Specifications |
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Configuration:
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• UIC | Co-Co |
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Gauge | 1,000 mm (3 ft 3+3⁄8 in) metre gauge |
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Bogies | ALCO Asymmetric cast frame trimount |
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Wheel diameter | 965 mm (37.99 in) |
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Length | 15.60 m (51 ft 2+1⁄8 in) |
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Width | 2,730 mm (8 ft 11+1⁄2 in) |
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Height | 3,635 mm (11 ft 11+1⁄8 in) |
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Axle load | 12,000 kg (26,000 lb) |
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Loco weight | 72,000 kg (159,000 lb) ALCo/DLW, 67,000 kg (148,000 lb) MLW |
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Fuel type | Diesel |
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Fuel capacity | 3,000 L (660 imp gal; 790 US gal) |
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Lubricant cap. | 530 L (120 imp gal; 140 US gal), 630 L (140 imp gal; 170 US gal) DLW |
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Water cap. | 22 L (4.8 imp gal; 5.8 US gal), 28 L (6.2 imp gal; 7.4 US gal) DLW |
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Prime mover | ALCO 251-D |
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RPM range | 400-1100 |
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Engine type | Inline-6 diesel |
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Aspiration | Turbo-supercharged |
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Displacement | (?) |
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Generator | DC |
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Traction motors | 6 DC |
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Cylinders | 6 |
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Cylinder size | 228 mm × 267 mm (8.98 in × 10.51 in) bore x stroke |
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Transmission | Diesel-electric transmission |
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MU working | 2 |
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Loco brake | 28LV-1, Air brake for Locomotive using SA-9 brake handle |
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Train brakes | Originally Vacuum using A-9 brake handle, some modified to Dual |
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Performance figures |
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Maximum speed | 96 km/h (60 mph) |
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Power output | Max:1,400 hp (1,000 kW) Site rated:1,300 hp (970 kW) |
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Tractive effort | 18.935 t (19 long tons; 21 short tons) maximum 16.050 t (16 long tons; 18 short tons) continuous |
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Career |
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Operators | Indian Railways, IRCON, KTMB Malaysia, Myanmar Railways, Vietnam Railways, Royal Railways, Mozambique Ports and Railways, Togorail |
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Numbers | 6020-6049 ALCo, 6105-6129 ALCo, 6130- 6198 MLW, 6199-6258 DLW, 6259-6288 MLW, 6289-6769 DLW |
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Locale | All over Indian Railways, Leased to KTMB Malaysia, Leased to Myanmar Railway, 25 units operate by Vietnam Railways |
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Preserved | 3 |
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Current owner | Indian Railway, IRCON, KTMB Malaysia, Myanmar Railway, Vietnam Railways |
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Disposition | active |
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Close
The YDM-4A is a variant of the YDM-4 that is supplied by MLW . Originally equipped with vacuum brakes, some were later equipped with dual brakes, particularly those working in the Northeast Frontier Railway.