Indian locomotive class YDM-1

The Indian locomotive class YDM-1 is a class of diesel-Hydraulic locomotive that was developed in 1954 by North British Locomotive Company (NBL) for Indian Railways. The model name stands for Metre gauge (Y), Diesel (D), Mixed traffic (M) engine, 1st generation (1). They entered service in 1955. A total of 20 YDM-1 locomotives was built between 1954 and 1956, which made them among the first MG main-line diesels.

Indian locomotive class YDM-1
A YDM-1 class locomotive no 6002 preserved at National Rail Museum, New Delhi
Type and origin
Power typeDiesel
DesignerNorth British Locomotive Company (NBL)
BuilderNorth British Locomotive Company (NBL)
Order numberPR/4574/S/4910/52
Build date1952
Total produced20
RebuilderCLW
Rebuild date1974-1976
Number rebuilt20
Specifications
Configuration:
​
 • AARB'-B'
 • UICB-B
 • CommonwealthBo-Bo
Gauge1,000 mm (3 ft 3 3⁄8 in) metre gauge
Wheel diameter804 mm (31.65 in)
Wheelbase2,134 mm (84.02 in)
 • Engine1
Length:
​
 • Over couplers12.020 m (39 ft 5 1⁄4 in)
 • Body10.630 m (34 ft 10 1⁄2 in)
Width2,743 mm (9 ft 0 in)
Height3,421 mm (11 ft 2 5⁄8 in)
Axle load11,000 kg (24,000 lb)
Loco weight43,680 kg (96,300 lb)
Fuel typeDiesel
Fuel capacity3,724 L (819 imp gal; 984 US gal)
Lubricant cap.200 L (44 imp gal; 53 US gal)
Coolant cap.204 L (45 imp gal; 54 US gal)
Sandbox cap.0.35 L (0.077 imp gal; 0.092 US gal)
Power supply110 V DC supply
Prime moverEarlier Paxman V12 RPHXL II, 625/580hp replaced by Mak/CLW L6 6M 282 A(K), 700hp
Engine RPM:
 • RPM low idle		525
 • RPM idle525
 • Maximum RPM1250
Engine type12RPHXL/II
AspirationTurbo-supercharged
AlternatorBoom Wade N5
GeneratorC.A.V D3-9
Head end power110 V DC
Cylinders12
TransmissionVoith hydraulic with Cardan shaft drive to bogies
MU working2
Loco brakeAir brake, hand brakes,
Train brakesVacuum brake
Compressor494 L (109 imp gal; 131 US gal)
Exhauster852 L (187 imp gal; 225 US gal)
Performance figures
Maximum speed83 km/h (52 mph)
Power outputEarlier Paxman V12 RPHXL II 580 hp (430 kW) replaced by Mak/CLW L6 6M 282 A(K) 700 hp (520 kW)
Tractive effort:
​
 • Starting10.320 t (10 long tons; 11 short tons)
 • Continuous08.230 t (8 long tons; 9 short tons)
Career
OperatorsIndian Railways
ClassEarlier 'DY' class
Numbers6000-6019
Locale Western Railway zone
First run1955-56
Last run1995
Retired1995
Withdrawn1990s
Preserved3(6002, 6008, 6015)
Scrapped2000s
Current ownerNRM, ICF resume
DispositionAll except 3 scrapped

The YDM-1 served both passenger and freight trains for over 46 years. As of January 2020, all 20 locomotives have been withdrawn from service with 3 locomotives being preserved at various location around India.

Specification
A YDM-1 hauling a inspection special
Original No No 3001 to 3020
Maker's Name & No North British; Locomotive Co. Glasgow, UK, 27507
Builders North British Locomotive
Engine Paxman V12 RPHXL II, 625/580hp replaced by Mak/CLW L6 6M 282 A(K), 700hp
Transmission Voith hydraulic with Cardan shaft drive to bogies
Year Built 1954
Gear Box David Brown, UK
Wheel Arrangement B-B
Hauling Power 10,977 Kg
Tare Weight 42 Tonnes
Gauge 1 Metre
Cost Rs. 4,85,209/- (Capital Head)
Remarks Fitted with Automatic, Vacuum & Air Brake System
First Trip From Gandhi Dham to Palanpur
Last Service worked for Kandla Port and Naliya etc

Preserved Examples

A total of three YDM-1 locomotives have been preserved all over India. [1][2]

Class Manufacturer Loco Number Previous shed Name LIvery Location ref
YDM-1 NBL 6002 Gandhidham Orange with twin black stripes plinthed at National Railway Museum, Delhi (NRM) [3]
YDM-1R NBL 6008 Gandhidham Light blue/red/dark blue Preserved at Regional Rail Museum, Chennai. [4]
YDM-1 NBL 6012 Gandhidham Navy blue with yellow stripe Preserved at Regional Rail Museum, Chennai. [5]

Former shed
  • Gandhidham (GIM): All the locomotives of this class has been withdrawn from service.

See also

References
  1. "Ministry of Railways (Railway Board)". www.indianrailways.gov.in. Retrieved 2020-04-14.
  2. "preserve loco list".
  3. https://www.irfca.org/apps/locos/show/217?list_type=preserved
  4. https://www.irfca.org/apps/locos/show/223?list_type=preserved
  5. https://www.irfca.org/apps/locos/show/230?list_type=preserved
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