Indian locomotive class WDM-4

WDM-4^[1]

Preserved loco at National Rail Museum, New Delhi

Type and origin
Power type	Diesel
Builder	Electro-Motive Diesels
Model	GT16; SD-24
Build date	1962
Total produced	72

Specifications
AAR wheel arr.	C-C
UIC class	Co-Co, Co'Co'
Gauge	1,676 mm (5 ft 6 in)
Bogies	Flexicoil Mark I cast steel
Loco weight	112,800 kg (248,700 lb)
Fuel type	Diesel fuel
Engine type	two-stroke V16 diesel
Aspiration	Turbo-Supercharged
Cylinders	16
Transmission	Diesel electric
Train brakes	Vacuum

Performance figures
Maximum speed	Restricted: 120 km/h (75 mph) Running: 130 km/h (81 mph) Rated: 140 km/h (87 mph) Tested: 145 km/h (90 mph)
Power output	2,600 hp (1,900 kW)/ 2,430 hp (1,810 kW)
Tractive effort	28,200 kgf (276,548 N; 62,170 lbf)

Career
Operators	Indian Railways
Numbers	18000-039, 18080-18111
Locale	Northern Railway
Withdrawn	2001
Preserved	2 (18001, 18086)
Disposition	Withdrawn

The class WDM-4 is the fourth class of India's wide-gauge (W), diesel-fueled (D) and mixed-load (M) series, capable of hauling both freight and passenger trains. Despite the classification, it was never seen hauling freight trains. It is not known as to why IR decided to allot 4th class instead of 3rd as there was no WDM-3 at the time. This was India's first EMD locomotive, designated as GT16. ^[2] These were the fastest locomotives in India till the arrival of WAP-3. It does not come under the standard diesel classification system of IR. Similar to WDM-2, it could only haul 9 coaches. So for 18 coach Rajdhani Express, there used to be 2 locos of this class. One of them 18001, is preserved at National Rail Museum, Delhi. The gap in road numbers is due to the units delivered in Pakistan. 18004, 18022, 18098 and 18107 were purchased by IRCON International and sent to Bangladesh for construction work. These were withdrawn due to overageing. These in the end hauled passengers on Dehradun - Moradabad - Lucknow - Varanasi - Mughalsarai - Buxar - Patna - Howrah sections.^[3]

Technical specifications

Hauling capacity	2,400 tonnes (2,400 long tons; 2,600 short tons) t
Governor	Woodwards

Trains hauled by WDM-4

Doon Express
Howrah Rajdhani Express
AC Express (now Poorva Express)
Himgiri Express
Kashi Vishwanath Express
Bareilly-Mughalsarai Passenger
Ganga Gomti Express

Sheds Holding WDM-4

Mughalsarai (MGS)

Preserved

The very first unit 18001 is preserved at National Rail Museum and another unit from the second batch 18086 is preserved plinthed at Lucknow (Alambagh) Diesel Locoshed.

References

Broad gauge locomotives of India

Steam

BESA designs	SP SG PT HP AP HG HT

IRS designs	XA XB XC XD XE XF XG XH XP XT XS

World War II designs	AWD CWD AWC

IGR standard designs	WP WG WL (1st) WL (2nd) WM WT WU WV WW

Diesel

Mixed type	WDM-1 WDM 2 WDM 2A, WDM 2B WDM 3 WDM 3A WDM 3A R WDM 3C, WDM 3D WDM 4 WDM 6 WDM 7

Passenger	WDP 1 WDP 2/3A WDP 3 WDP 4 WDP 4B WDP 4D

Goods	WDG 2/3A WDG 3B, WDG 3C, WDG 3D WDG 4 WDG 5

Shunting	WDS 1 WDS 2 WDS 3/4C WDS 4, WDS 4A, WDS 4B, WDS 4D WDS 4C WDS 5 WDS 6 WDS 8

DC electric

Mixed type	WCM 1 WCM 2 WCM 3 WCM 4 WCM 5 WCM 6

Passenger	WCP 1, WCP 2 WCP 3, WCP 4

Goods	WCG 1 WCG 2

AC electric

Mixed type	WAM 1 WAM 2 WAM 3 WAM 4

Passenger	WAP 1 WAP 2 WAP 3 WAP 4 WAP 5 WAP 6 WAP 7

Goods	WAG 1 WAG 2 WAG 3 WAG 4 WAG 5 WAG 5A, WAG 5B WAG 6A WAG 6B, WAG 6c WAG 7 WAG 9

Dual (AC and DC) electric

Mixed type	WCAM 1 WCAM 2/2P WCAM 3

Goods	WCAG 1

Limited production, export and EMD engined locomotives by Electro-Motive Diesel

Electrics

Industrial, military, export
and narrow gauge

Streamliners

EMD-engined and
license-built units

British Rail	Class 57 Class 67

Córas Iompair Éireann	Class 001 Class 071 Class 121 Class 141 Class 181

CFL (Luxembourg)	Class 1600

Danish State Railways	Class ME Class MX Class MY Class MZ

Iarnród Éireann	Class 201

Indian Railways	Class WDM-4

Israel Railways	JT 42BW JT 42CW

Northern Ireland Railways	Class 111

Norwegian State Railways	NSB Di 4

NJ Transit	Alstom PL42AC

RENFE (Spain)	Class 310 Class 319 (early versions) Class 319 (later versions) Class 333 Class 334

SNCB (Belgium)	HLD 51 HLD 52 HLD 53 HLD 54 HLD 55 HLD 61 HLD 62 HLD 65

Swedish State Railways	T41 T43 T44

Vossloh	Euro

Experimentals

See also: List of GM-EMD locomotives

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