List of diesel locomotives of India

This article lists the diesel locomotives that have operated or are operating on Indian Railways.

Classification

Locomotives were classified by track gauge, motive power, function and power (or model number) in a four- or five-letter code. The first letter denotes the track gauge. The second letter denotes motive power (diesel or electric), and the third letter denotes use (goods, passenger, mixed or shunting). The fourth letter denotes a locomotive's chronological model number.

In 2002, a new classification system was adopted. For newer diesel locomotives, the fourth letter denotes their horsepower range. Not all diesel locomotives were reclassified, and the fourth letter continues to denotes their model number.

A locomotive may have a fifth letter, generally denoting a technical variant, subclass or subtype: a variation in the basic model or series, or a different motor or manufacturer. Under the new system, the fifth letter further refines horsepower in 100-hp increments: A for 100 hp, B for 200 hp, C for 300 hp and so on. A WDP-3A is a 3,100 hp (2,300 kW) locomotive, and a WDM-3F is 3,600 hp (2,700 kW).

The system does not apply to steam locomotives, which are no longer used on main lines. They retain their original class names, such as M- or WP-class.

Syntax

First letter (gauge):
- W – Broad gauge (wide) – 5 ft 6 in (1,676 mm)
- Y – Metre gauge (yard) – 1,000 mm (3 ft 3 ³⁄₈ in)
- Z – 2 ft 6 in (762 mm) narrow gauge
- N – 2 ft (610 mm) narrow (toy) gauge
Second letter (motive power):
- D – Diesel
- C – DC electric (DC overhead line)
- A – AC electric (AC overhead line)
- CA – DC and AC (AC or DC overhead line); CA is considered one letter
- B – Battery (rare)
Third letter (job type):
- G – Goods
- P – Passenger
- M – Mixed (goods and passenger)
- S – Shunting (switching)
- U – Multiple unit (electric or diesel)
- R – Railcar

In WDM 3A, W denotes broad gauge; D denotes diesel power; M denotes mixed use (goods and passenger service), and 3A denotes 3,100 hp (2,300 kW) (3,000 + 100). In WAP 5, W is broad gauge; A is AC electric; P is passenger service, and 5 indicates that the locomotive is the fifth model used.

Broad Gauge locomotives

Broad-gauge diesel classification codes are:

WDM – Wide diesel mixed
WDP – Wide diesel passenger
WDG – Wide diesel goods
WDS – Wide diesel shunter
WCDS – Wide converted diesel shunter

Mixed class

Name	Manufacturer	Wheel Arr	Quantity Built	Built year(s)	Power	Current Status	Preserved units	Comments
WDM-1	ALCO	Co-Co	100	1957-1959	1950 HP	Retired	1	First mainline diesel locomotive
WDM-2	ALCO	Co-Co	2700	1962–1998	2600 HP	In service	9	A few still in service
WDM-2G	DLW	Co-Co	2		2400 HP
WDM-3	Henschel	Bo-Bo	8	1970	2500 HP	Retired	None
WDM-3A	DLW	Co-Co	158 new 700 rebuilt	1994–1998	3100 HP	In service	1 Earmarked
WDM-3B	DLW	Co-Co	24, all rebuilt back to WDM-3D	2005-2006	3100 HP	In service		All rebuilt back to WDM-3D
WDM-3C	DLW	Co-Co	10	2002	3300 HP	In service	None	All rebuilt back to WDM-3A
WDM-3D	DLW	Co-Co	344	2003-2013	3300 HP	In service
WDM-3E	DLW	Co-Co	5	2008	3500 HP	In service
WDM-3F	DLW	Co-Co	5	2008	3600 HP	In service
WDM-4	GM	Co-Co	72	1962	2600 HP	Retired	2
WDM-6	DLW	Bo-Bo	2	1981-1982	1350 HP	Retired	2	Both units earmarked for preservation
WDM-7	DLW	Co-Co	15	1987–1989	2000 HP	In service	1 Earmarked	Currently used for shunting uses only

Passenger class

Name	Manufacturer	Wheel Arr	Quantity Built	Built year(s)	Power	Current Status
WDP-1	DLW	Bo-Bo	69	1995–1999	2300 HP	In service
WDP-3A	DLW	Co-Co	69	1998–2002	3100 HP	In service
WDP-4	EMD	Bo1-1Bo	102	2002–2011	4000 HP	In service
WDP-4B	DLW	Co-Co	90	2010–2014	4500 HP	In service
WDP-4D	DLW	Co-Co	234	2010–2018	4500 HP	In service

Freight class

Name	Manufacturer	Wheel Arr	Quantity Built	Built year(s)	Power	Current Status
WDG-3A	DLW	Co-Co	1998	1995–2010	3100 HP	In service
WDG-3B	DLW	Co-Co	4	2004	3200 HP	In service
WDG-3C	DLW	Co-Co	1	2001	3300 HP	In service
WDG-3D	DLW	Co-Co	1	2001	3400 HP	In service
WDG-4	EMD	Co-Co	431	1999–2012	4000 HP	In service
WDG-4G	GE		191	2017-present	4500 HP	In service
WDG-4D	DLW	Co-Co	240	2013–2018	4000 HP	In service
WDG-5	DLW	Co-Co	7	2012-2017	5000 HP	In service
WDG-6G	GE	Co-Co	1	2018-present	6000 HP	In service

Shunter Class

Name	Manufacturer	Wheel Arr	Quantity Built	Built year(s)	Power	Current Status	Preserved units
WDS-1	GE	Bo-Bo	15	1944-1945	386 HP	Retired	1
WDS-2		C	30	1954-1955	440 HP	Retired
WDS-3		C	7	1961	618 HP	Retired
WDS-4	CLW	C	27	1968-1969	600 HP	Retired	4
WDS-4A	CLW	C	5	1968	660 HP	Retired
WDS-4B	CLW	C	450	1969	700 HP	Retired
WDS-4C	CLW	C	7	1976-78	700 HP	Retired
WDS-4D	CLW	C	120	1984-97	700 HP	Retired
WDS-5	ALCO	Co-Co	21	1967	1065 HP	Retired
WDS-6	DLW	Co-Co	270	1975–	1400	In service	2 Earmarked
WDS-6AD	DLW	Co-Co	270	1975–	1400	In service	2 Earmarked
WDS-8	CLW	Bo-Bo	5	1979-1982	800 HP	Retired

Meter gauge locomotives

Name	Manufacturer	Wheel Arr	Quantity Built	Built year(s)	Current Status
YDM-1	NBL	B-B			Retired
YDM-2	CLW	B-B			Retired
YDM-3	GM	B-B			Retired
YDM-4	ALCO	Co-Co	541	1961–1993	In service
YDM-5	GM	C-C			Retired

References

Notes

Bibliography

Hughes, Hugh (1996). Indian Locomotives: Part 4 – 1941–1990. Harrow, Middlesex: The Continental Railway Circle. ISBN 0-9521655-1-1.

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