Mixed type locomotives:

WDM 1 (First mainline diesel electric locomotives used in India. Introduced in 1957. Imported from ALCO. Out of service now. 1950 hp)

WDM 2 (Most widely used and first homemade mainline diesel-electric locomotives in India. Original prototypes were made by ALCO. Introduced in 1962. More than 2700 have been made. Rated at 2600 hp)

WDM 2A, WDM 2B

(Technical variants of WDM 2)

WDM 3 (Only 8 were imported. They used hydraulic transmission and are currently non-functional)

WDM 3A (Formerly WDM 2C. Another WDM 2 variant. It is not related to WDM3. 3100 hp)WDM 3C, WDM 3D

(higher powered versions of WDM 3A)

WDM 4 (Entered service along with WDM 2. Prototypes designed by General Motors. Though considered superior to WDM 2 in many ways, these locomotives weren't chosen as General Motors did not agree to a technology transfer agreement. 2600 hp)

WDM 6 (Very rare class; only two were made; one is being used by Puttalam Cement Factory in Sri Lanka. Rated at 1200 HP)

WDM 7 they were designed for branch-line duties, but they are now used mostly for shunting. Rated at 2000hp

WDM 5 No locomotive class was designated as WDM5 in India.

Passenger Locomotives:

WDP 1

WDP 2 (New class name WDP 3A. Dedicated passenger diesel locomotive. Entered service in 1998. Powerful locomotive. 3100 hp)

WDP 3 This locomotives are actually prototypes of the class WDP 1 and never entered serial production

WDP 4 EMD (former GM-EMD) GT46PAC, fundamentally a passenger version of the WDG 4 (GT46MAC). 4000 hp

WDP 4B EMD (former GM-EMD) GT46PAC, An improved version of the WDP 4, this is a more powerful version and has 6 traction motors, just like the WDG 4. Also comes with wider cabin to aid visibility and minor exterior design changes. 4500 hp

WDP 4D EMD (former GM-EMD) GT46PAC, This is basically a WDP 4B with twin cabs. Minor changes were made to the locomotive to facilitate the addition of a second cabin. This locomotive comes with LCD instrument display and toilet for the drivers. As of now, two units have been made and are expected to enter full-time service soon. 4500 hp.

Goods locomotives:

WDG 2 New class name WDG 3A. These class is actually a technically upgraded form of WDM 2WDG 3B, WDG 3C, WDG 3D

Technical upgraded forms of WDG 2 or WDG 3A

WDG 4 New dedicated goods locomotives. These are General motors' GT46MAC models. First units were imported in 1999. They are numbered from #12000 upward. Local production started on 2002. 4000 hp

Shunting locomotives (Also known as switching engines):

WDS 1 First widely deployed and successful diesel locomotives used in India. Imported in 1944-45. Currently out of service. 386 HP

WDS 2 Currently out of serviceWDS 3 All locomotives of this class were rebuilt and reclassified as WDS 4C in 1976-78. 618 HPWDS 4, WDS 4A, WDS 4B, WDS 4D

Designed by Chittaranjan Locomotive Works. 600-700 hp

WDS 4C Rebuilt WDS 3 locos as mentioned aboveWDS 5 Some of these locomotives are used for industrial shunting. A few are used on Indian

Railways. Rated at 1065hpWDS 6 Heavy-haul shunters made in large numbers for industrial concerns as well as for Indian

Railways Rated at 1200/1350hpWDS 8 Only five of these were made, and all were transferred to steel works 800hp

Note: There is no electric shunting engine in India. Classes from WDS 1 to WDS 4D have hydraulic transmission. The WDS 4, 4A, 4B, 4C and 4D are the only still existing broad gauge locomotives with diesel-hydraulic transmission.

Diesel multiple units:A few routes in India currently have Diesel multiple unit service. Depending on the transmission system they are classified as DEMU (diesel-electric transmission) or DHMU (diesel-hydraulic transmission). There are diesel railcar services in a few places known as 'railbus'.

DC electric tractionNote: These locomotives are, or were used only in sections around Mumbai which is the only location in India still using DC traction. The power operated is 1500V DC.

Mixed type locomotives:

WCM 1 First electric locomotives with the now familiar Co-Co wheel arrangement to be used in India. 3700 hp

WCM 2 520hpWCM 3 600hp - Used in Kolkata , then transferred to Mumbai, Built by HitachiWCM 4 675hp - Also built by HitachiWCM 5 Built by Chittaranjan locomotive works to RDSO's design specifications. Auxiliaries by

Westinghouse and North Boyce. Built in 1962, these are India's first indigenously designed DC electric locomotives. The first was named 'Lokamanya' after the Congress leader Bal Gangadhar Tilak. 3700 hp

WCM 6 A rare and highly powerful class. 5000 hp, only two were built. Now converted to run on AC power, class name changed to WAM 4

Passenger locomotives:

WCP 1, WCP 2(GIPR EA/1 and EA/2

Historically very important locomotives as these are the very first electric loco to be used in India. The first locomotive was named as Sir Roger Lumney and is currently preserved in the National Rail Museum, New Delhi. 2160 hp

WCP 3, WCP 4 GIPR EB/1 and EC/1, these are also among the earliest electric locos used in India

Goods locomotives:WCG 1 (GIPR EF/1

These are Swiss crocodile locomotives imported in 1928 from Swiss locomotive works. These are among the earliest electric locos used in India. The first locomotive was named as Sir Leslie Wilson and is currently preserved in the National Rail Museum, New Delhi. 2600-2950 hp

WCG 2 Designed by Chittaranjan locomotive works in 1970

AC electric tractionThe 25 kV AC system with overhead lines is used throughout the rest of the country.

Mixed type locomotivesWAM 1 Among the first AC electric locomotives used in India. Introduced in 1959. Now out of

service. 3010 hpWAM 2WAM 3WAM 4 Indigenously designed by Chittaranjan Locomotive Works in 1970. Highly powerful class.

One of the most successful locomotives in India. 3850 hp

Passenger locomotivesWAP 1 Designed by Chittaranjan locomotive works in 1980 for the Kolkata-Delhi Rajdhani Express.

A very successful class. 3900 hpWAP 2 Not in use

WAP 3 Not in useWAP 4 Upgraded from WAP 1 for higher loads by Chittaranjan locomotive works in 1994. One of

the most successful locomotives in India. Very powerful class. 5350 hpWAP 5 Imported in 1995 from Switzerland and used on premier express trains. 5450 hpWAP 6 Only found near AsansolWAP 7 Same design as WAG 9 with modified gear ratio. Highly powerful class. 6250 hp

Goods locomotivesWAG 1WAG 2WAG 3WAG 4WAG 5 The most successful electric locomotives in India. Designed by chittaranjan locomotive

works in 1984. More than 1100 were made. 3850 hpWAG 5A, WAG 5B

Technical variants of WAG 5

WAG 6A Imported from ASEA and Hitachi. 6110 hpWAG 6B, WAG 6c

Variants of WAG 3A. All rated at 6110 hp

WAG 7 Very successful class. Designed by chittaranjan locomotive works. 5000 hpWAG 9 Currently the most powerful class in India, rated at 6350 hp. Same design as WAP 7 with

modified gear ratio. Designed by Adtranz, Switzerland

Dual (both AC and DC) tractionNote: These locomotives are, or were used only in sections around Mumbai which is the only location in India still using DC traction. They can run under AC traction too. The main purpose behind the manufacture of these types of locomotives was to provide transportation in and out Mumbai area without changing the engine.

Mixed type locomotives:WCAM 1WCAM 2WCAM 3 Designed by Bharat Heavy Electricals Limited. 4600 hp under DC traction and 5000 hp

under AC traction

Goods locomotives:WCAG 1 Designed by Bharat heavy electricals limited. 2930 hp under DC traction and 4720 hp

under AC traction

Note: There is no dedicated dual current passenger locomotive in India, but in Mumbai area, there are some EMUs which can run under dual traction.