Locomotive class information

Locomotive class information

Notes

First letter denotes the gauge:

W = Broad gauge (5'6"/1676mm)

Y = Metre gauge (3'3^3/8")

Z = Narrow gauge (2'6"/762mm)

P = Passenger

G = Goods
The suffix numbers and letters indicate sub-classes and variants. A memo from the Executive Director Mechanical Engineering (Traction), Railway Board dated 14/03/02, advised of a revised diesel locomotive classification system. The letters remained unchanged but the suffix numbers/letters were given new meaning. The first digit after M. P, or G indicates the horsepower range; 3 for 3000hp and 4 for 4000hp. The letter after this digit will indicate additional horsepower above 3000 or 4000. For example:
A = additional 100hp

C = additional 300hp

F = additional 600hp
As an example, the WDM2Cs (rebuilt from standard WDM2s) will become WDM3As. The classification of existing WDM2Cs, WDP2s and WDG2s is to be changed. However, there will be no change in the nomenclature of WDM2s and WDP1s (no mention was made of any other classes). The target date for completing the changeover is 30.6.2002
Alco – Alco Products/American Locomotive Company, Schenectady, New York State, U.S.A.

BHEL – Bharat Heavy Electricals Ltd, Bhopal and Jhansi

CLW – Chittaranjan Locomotive Works, Chittaranjan

DLW – Diesel Locomotive Works, Varanasi, Uttar Pradesh

GMDD – General Motors Diesel Division, London, Ontario, Canada

GM-EMD – General Motors Electro Motive Division, Chicago, Illinois, U.S.A.

ICF – Integral Coach Factory, Perambur, Chennai

JJR – Jayanagar-Janakpur Railway, Nepal

KCL – Kirloskar Cummings Ltd, Pune

K-M – Krauss-Maffei, Germany

Mak – Maschinenbau Kiel, Germany

MAN – Maschinenfabrik Nuernberg-Augsburg, Germany

MLW – Montreal Locomotive Works, Montreal, Quebec, Canada

MWM – Motorenwerke Mannheim, Germany

Narrow gauge

ZDM₁

Builder	Jung
Build date	1955
Builders code/model No.	?
No. Built	5
Engine	2 x MWM TRHS 518S, 145/128hp
Transmission	Hydraulic, 2 x Voith
Brakes	?
Wheel arrangement	B'+B'
Maximum speed	33 kmh
Weight	29 tonnes
Train heating	?

Notes: Built as class DZ. Between 1976 - 1982 4 were converted to NDM₁.

ZDM₂

Builder	Mak
Build date	1964 - 1965
Builders code/model No.	?
No. Built	25
Engine	Maybach V8 MD435, 650/700hp
Transmission	Hydraulic, Voith
Brakes	?
Wheel arrangement	B'B'
Maximum speed	50 kmh
Weight	32 tonnes
Train heating	?

Notes:

ZDM₃

Builder	CLW
Build date	1970 - 1982
Builders code/model No.	ZDM3
No. Built	40
Engine	Mak/CLW 6M 282 A(K), 700hp
Transmission	Hydraulic, Suri
Brakes	?
Wheel arrangement	B'B'
Maximum speed	50-32 kmh
Weight	35 tonnes
Train heating	?

Notes:

ZDM₄

Builder	CLW
Build date	1975 - 1977
Builders code/model No.	ZDM4
No. Built	10
Engine	Mak/CLW 6M 282 A(K), 700hp
Transmission	Hydraulic, Suri
Brakes	?
Wheel arrangement	1B'B1'
Maximum speed	50 kmh
Weight	39 tonnes
Train heating	?

Notes: All rebuilt to ZDM₃ but retaining existing numbers. Extra axle removed from each bogie.

ZDM_4A

Builder	CLW
Build date	1982 - 1990
Builders code/model No.	ZDM4A
No. Built	39
Engine	Mak/CLW 6M 282 A(K), 700hp
Transmission	Hydraulic, Voith
Brakes	?
Wheel arrangement	1B'B1'
Maximum speed	50 kmh
Weight	39 tonnes
Train heating	?

Notes: In 1996 1 loco went to Nepal JJR.

ZDM₅

Builder	CLW
Build date	1989 - 19??
Builders code/model No.	ZDM5
No. Built	41+
Engine	KCL KTA-1150L, 450hp
Transmission	Hydraulic, Voith
Brakes	Dual train brakes
Wheel arrangement	B'B'
Maximum speed	50 kmh
Weight	23 tonnes
Train heating	?

Notes: From 1994 4 locos went to Nepal JJR.

NDM₁

Builder	Jung
Build date	1955
Builders code/model No.	?
No. Built	3
Engine	2 x MWM TRHS 518S, 145/128hp
Transmission	Hydraulic, 2 x Voith
Brakes	?
Wheel arrangement	B'+B'
Maximum speed	33-16 kmh
Weight	29 tonnes
Train heating	?

Notes:
NDM₅

Builder	CLW
Build date	1987 - 1989
Builders code/model No.	ZDM5
No. Built	11
Engine	KCL KTA-1150L, 450hp
Transmission	Hydraulic, Voith
Brakes	Dual train brakes
Wheel arrangement	B'B'
Maximum speed	50 kmh
Weight	22 tonnes
Train heating	?

Notes:

Metre gauge
YDM₁

Builder	North British Locomotive Company
Build date	1955 - 1956
Builders code/model No.	?
No. Built	20
Engine	Paxman V12 RPHXL II (625/580hp), re-engined with Mak/CLW L6 6M 282 A(K) (700hp)
Transmission	Hydraulic, Voith
Brakes	?
Wheel arrangement	B'-B'
Maximum speed	88 kmh
Weight	44 tonnes
Train heating	?

Notes:

YDM₂

Builder	CLW
Build date	1986 - 1990
Builders code/model No.	YDM2
No. Built	41
Engine	Mak/CLW L6 6M 282 A(K) (700hp)
Transmission	Hydraulic, Voith
Brakes	?
Wheel arrangement	B'-B'
Maximum speed	75 kmh
Weight	48 tonnes
Train heating	?

Notes:

YDM₃

Builder	GM-EMD
Build date	1961 - 1962
Builders code/model No.	GA12
No. Built	30
Engine	EMD 12-567C, 1390/1260hp
Transmission	Electric
Brakes	?
Wheel arrangement	1B'B1'
Maximum speed	80 kmh
Weight	59 tonnes
Train heating	?

Notes:

YDM₄ and YDM_4A

Builder	6020 – 6049, Alco 6105 – 6129, Alco 6130 – 6198, MLW 6199 – 6258, DLW 6259 – 6288, MLW 6289 – 6769, DLW
Build date	Alco – 1961 – 1964, DLW – 1968 – 1993, MLW – 1964 & 1967-1969
Builders code/model No.	DL535A/RSD30
No. Built	Alco – 127, DLW – 527 (approx), MLW – 99
Engine	Alco 251B-6 (Alco & MLW built locos) Alco 251D-6, 1350hp (DLW built locos)
Transmission	Electric
Brakes	Vacuum train and dynamic
Wheel arrangement	Co-Co (Trimount bogies)
Maximum speed	96 kmh (DLW website claims 110 kmh)
Weight	72t
Train heating	Not fitted

Notes:

YDM₅

Builder	GM-EMD
Build date	1964
Builders code/model No.	GA12
No. Built	25
Engine	EMD 12-567C, 1390/1260hp
Transmission	Electric
Brakes	Dynamic brakes fitted
Wheel arrangement	C'C'
Maximum speed	80 kmh
Weight	69 tonnes
Train heating	?

Notes:

DLW works shunters

Builder	DLW
Build date	After 1967
Builders code/model No.	?
No. Built	2
Engine	250hp
Transmission	Hydraulic
Brakes	?
Wheel arrangement	0-4-0
Maximum speed	?
Weight	?
Train heating	?

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