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

Mixed class (WDM series)

Name	Manufacturer	Wheel Arr	Quantity Built	Built year(s)	Power	Current Status	Preserved units	Comments	Picture
WDM-1	ALCO	Co-Co	100	1957-1959	1950 HP	Retired	1	First mainline diesel locomotive
WDM-2	ALCO/BLW	Co-Co	1440	1962–1998	2600 HP	In service	9	A few still in service
WDM-2G	BLW	Co-Co	2	2013	2400 HP	In Service			File:WDM-2G 80000.jpg
WDM-3	Henschel	Bo-Bo	8	1962-1970	2500 HP	Retired	None		File:WDM-3.jpg
WDM-3A	BLW	Co-Co	1402	1994–2015	3100 HP	In service	1 Earmarked		File:TKD WDM3A 16377.jpg
WDM-3B	BLW	Co-Co	8, all rebuilt back to WDM-3D	2005-2006	3100 HP	In service		All rebuilt back to WDM-3D	File:GD WDM3B.jpg
WDM-3C	BLW	Co-Co	10	2002	3300 HP	In service	None	All rebuilt back to WDM-3A	File:KTE WDM3C.jpg
WDM-3D	BLW	Co-Co	500	2003-2016	3300 HP	In service			File:ET WDM-3D.jpg
WDM-3E	BLW	Co-Co	8	2008	3500 HP	In service			File:A WDM3D locomotive from Jhansi shed in a complete new livery - Flickr - Dr. Santulan Mahanta
WDM-3F	BLW	Co-Co	3	2008	3600 HP	In service			File:GY WDM3F.jpg
WDM-4	GM	Co-Co	72	1961-1962	2600 HP	Retired	2
WDM-6	BLW	Bo-Bo	2	1981-1982	1350 HP	Retired	2	Both units earmarked for preservation	File:WDM-6.jpg
WDM-7	BLW	Co-Co	15	1987–1989	2000 HP	In service	1 Earmarked	Currently used for shunting uses only

Passenger class (WDP series)

Name	Manufacturer	Wheel Arr	Quantity Built	Built year(s)	Power	Current Status	Picture
WDP-1	BLW	Bo-Bo	69	1995–1999	2300 HP	In service	File:TKD WDP1.jpg
WDP-3A	BLW	Co-Co	69	1998–2001	3100 HP	In service	File:KYN WDP-3A.jpg
WDP-4	EMD/BLW	Bo1-1Bo	100	2001–2010	4000 HP	In service
WDP-4B	BLW	Co-Co	86	2010–2014	4500 HP	In service	File:TKD WDP4B.jpg
WDP-4D	BLW	Co-Co	525	2010–2018	4500 HP	In service	File:KYN WDP4D.jpg

Goods class (WDG series)

Name	Manufacturer	Wheel Arr	Quantity Built	Built year(s)	Power	Current Status	Picture
WDG-3A	BLW	Co-Co	1164	1994–2015	3100 HP	In service	File:KYN WDG3A.jpg
WDG-3B	BLW	Co-Co	4	2004	3200 HP	In service
WDG-3C	BLW	Co-Co	1	2001	3300 HP	In service
WDG-3D	BLW	Co-Co	1	2001	3400 HP	In service
WDG-4	EMD/BLW	Co-Co	1188	1997–2017	4000 HP	In service	File:WDG4-4.jpg
WDG-4G	GE	Co-Co	291	2017–present	4500 HP	In service	File:ROZA WDG4G.jpg
WDG-4D	EMD	Co-Co	583	2013–2017	4500 HP	In service
WDG-5	EMD	Co-Co	7	2012-2018	5500 HP	In service	File:SBI WDG5.jpg
WDG-6G	GE	Co-Co	43	2019–present	6000 HP	In service	File:ROZA WDG6G.jpg

Shunter class (WDS series)

Name	Manufacturer	Wheel Arr	Quantity Built	Built year(s)	Power	Current Status	Preserved units	Comments	Picture
WDS-1	GE	Bo-Bo	15	1944-1945	386 HP	Retired	1	India's first diesel locomotive
WDS-2	Kraus Maffei	C	30	1954-1955	440 HP	Retired
WDS-3	Maschi- nenbau Kiel	C	7	1961	618 HP	Retired			File:WDS-3.jpg
WDS-4	CLW	C	27	1967-1969	600 HP	Few are still in service	4	A few still in service
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			File:WDS-3.jpg
WDS-4D	CLW	C	120	1984-90	700 HP	Retired
WDS-5	ALCO/BLW	Co-Co	21	1967	1065 HP	In service		A few still in service
WDS-6	BLW	Co-Co	270	1975–	1400	In service	2 Earmarked		File:SSB WDS6.jpg
WDS-6AD	BLW	Co-Co	270	1975–	1400	In service	2 Earmarked
WDS-8	CLW	Bo-Bo	5	1979-1982	800 HP	Retired			File:WDS-8.jpg

Meter-gauge locomotives

Metre-gauge diesel classification code is:

YDM - Metre gauge diesel mixed

Mixed class (YDM series)

Name	Manufacturer	Wheel Arr	Quantity Built	Built year(s)	Power	Current Status	Picture
YDM-1	NBL	B-B	20	1954-56	700	Retired
YDM-2	CLW	B-B	41	1986-90	700	Retired	File:YDM-2.jpg
YDM-3	GM	1'Bo'Bo'1	30	1961-62	1390	Retired	File:YDM-3.jpg
YDM-4	ALCO/BLW	Co-Co	695	1961–1993	1400	In service	File:SABI YDM4.jpg
YDM-5	GM	Co-Co	25	1963-1964	1390	Retired

Narrow-gauge locomotives

Narrow-gauge diesel classification codes are:

ZDM - Narrow gauge 2 ft 6 in diesel mixed
NDM - Narrow gauge 2 ft diesel mixed

Mixed class (ZDM series)

Name	Manufacturer	Wheel Arr	Quantity Built	Built year(s)	Power	Current Status
ZDM-1	Arn. Jung	B+B	5	1955	290	Retired
ZDM-2	Maschi-nenbau Kiel	B-B	25	1964-65	700	Retired
ZDM-3	CLW	B-B	40	1970-82	700	In service
ZDM-4/4A	CLW	1-B-B-1	10/39	1975-77/1982-90	700	In service
ZDM-5	CLW	B-B	41	1989+	450	In service