YDM-4
Indian locomotive class YDM-4
 |
| Type and origin |
| Power type |
Diesel |
| Builder |
Alco, MLW, DLW
|
| Model |
DL535, DL535A, RSD-30
|
| Build date |
1961 onwards |
| Total produced |
800 Approximately |
|
| Specifications |
Configuration:
|
|
| • UIC
|
Co-Co, Co'Co' |
| Gauge |
1,000 mm (3 ft 3 3⁄8 in) |
| Bogies |
ALCO Asymmetric cast frame trimount |
| Wheel diameter |
965 mm (3 ft 2 in) |
| Length |
15.60 m (51 ft 2 1⁄8 in) |
| Width |
2,730 mm (8 ft 11 in) |
| Height |
3,635 mm (11 ft 11 in) |
| Axle load |
12,000 kg (26,000 lb) |
| Loco weight |
72,000 kg (159,000 lb) ALCo/DLW, 67,000 kg (148,000 lb) MLW |
| Fuel type |
Diesel |
| Fuel capacity |
3,000 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 mover |
ALCO 251-D |
|
RPM range |
400-1100 |
| Engine type |
Inline-6 diesel
|
| Aspiration |
Turbo-supercharged |
| Displacement |
267 mm |
| Generator |
DC |
| Traction motors |
6 DC |
| Cylinders |
6 |
| Transmission |
Diesel-electric transmission |
| MU working |
2 |
| Loco brake |
28LV-1, Air brake for Locomotive using SA-9 brake handle |
| Train brakes |
OriginallyVacuum using A-9 brake handle, some modified to Dual
|
|
| Performance figures |
| Maximum speed |
96 km/h (60 mph) |
| Power output |
Max:1,400 hp (1,000 kW)
Site rated:1,300 hp (970 kW) |
| Tractive effort |
18.935 t (19 long tons; 21 short tons) maximum 16.050 t (16 long tons; 18 short tons) continuous |
|
| Career |
| Operators |
Indian Railways |
| Numbers |
6020-6049 ALCo, 6105-6129 ALCo, 6130- 6198 MLW, 6199-6258 DLW, 6259-6288 MLW, 6289-6769 DLW |
| Locale |
All over Indian Railways, Leased to KTMB Malaysia, Leased to Myanmar Railway |
| Preserved |
3 |
| Current owner |
Indian Railway, IRCON |
| Disposition |
active |
|
| Type and origin |
| Power type |
Diesel |
| Builder |
Alco, MLW, DLW
|
| Model |
DL535, DL535A, RSD-30
|
| Build date |
1961 onwards |
| Total produced |
800 Approximately |
| Specifications |
Configuration:
|
|
| • UIC
|
Co-Co, Co'Co' |
| Gauge |
1,000 mm (3 ft 3 3⁄8 in) |
| Bogies |
ALCO Asymmetric cast frame trimount |
| Wheel diameter |
965 mm (3 ft 2 in) |
| Length |
15.60 m (51 ft 2 1⁄8 in) |
| Width |
2,730 mm (8 ft 11 in) |
| Height |
3,635 mm (11 ft 11 in) |
| Axle load |
12,000 kg (26,000 lb) |
| Loco weight |
72,000 kg (159,000 lb) ALCo/DLW, 67,000 kg (148,000 lb) MLW |
| Fuel type |
Diesel |
| Fuel capacity |
3,000 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 mover |
ALCO 251-D |
|
RPM range |
400-1100 |
| Engine type |
Inline-6 diesel
|
| Aspiration |
Turbo-supercharged |
| Displacement |
267 mm |
| Generator |
DC |
| Traction motors |
6 DC |
| Cylinders |
6 |
| Transmission |
Diesel-electric transmission |
| MU working |
2 |
| Loco brake |
28LV-1, Air brake for Locomotive using SA-9 brake handle |
| Train brakes |
OriginallyVacuum using A-9 brake handle, some modified to Dual
|
| Performance figures |
| Maximum speed |
96 km/h (60 mph) |
| Power output |
Max:1,400 hp (1,000 kW)
Site rated:1,300 hp (970 kW) |
| Tractive effort |
18.935 t (19 long tons; 21 short tons) maximum 16.050 t (16 long tons; 18 short tons) continuous |
| Career |
| Operators |
Indian Railways |
| Numbers |
6020-6049 ALCo, 6105-6129 ALCo, 6130- 6198 MLW, 6199-6258 DLW, 6259-6288 MLW, 6289-6769 DLW |
| Locale |
All over Indian Railways, Leased to KTMB Malaysia, Leased to Myanmar Railway |
| Preserved |
3 |
| Current owner |
Indian Railway, IRCON |
| Disposition |
active |
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 Diesel Locomotive Works (DLW), 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).
In the mid 1950s Indian Railways began introducing diesel locomotives to its metre gauge system. Metre gauge, though rare gauge today, used to be a dominant gauge that time. After the introduction of YDM-1 locomotives by North British, Indian Railway thught for more powerful ones and hence General Motors Electro-Motive Division (EMD) and the American Locomotive Company (ALCO) submitted designs of YDM-3 (12-567C) and YDM-4 respectively for new diesel locomotives. Each company supplied 30 locomotives in 1961. While YDM-3 was 13 ton lighter than the YDM-4, Indian Railways opted for the ALCo design because of the heavier axle load and technology agreement that would allow these locomotives to be manufactured in India. After Diesel Locomotive Works (DLW) completed construction of its factory in Varanasi, production of the locomotives began in India. Initial 30 YDM-4 locomotives supplied by American Locomotive Company (ALCo) in 1961 had the road numbers in #6020 to #6049 range. Another batch of 8 locomotives followed the route to India soon which had the road numbers in #6105-6112 range. YDM-4 #6113-6129 were built perhaps in 1964. Siliguri Diesel Lcoshed was the first DLS to home YDM-4 locomotives in 1962. The very first YDM4 numbered as #6020 was allotted to New Guwahati Diesel Loco Shed which was an outbase of Siliguri DLS on 30/10/1962. The loco, however is assumed to be scrapped due to overage.
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