A locomotive or engine is a rail transport vehicle that provides the motive power for a train. Locomotives were classified by track gauge, motive power, function and power (or model number) in a four- or five-letter code.
First letter denotes the track gauge
Second letter denotes motive power (diesel or electric)
Third letter denotes use (goods, passenger, mixed or shunting)
The fourth letter denotes model number.
First letter (gauge):
W – Broad gauge
Y – Metre gauge
Z – 2 ft 6 in narrow gauge
N – 2 ft 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)
B – Battery (rare)
Third letter (job type):
G – Goods
P – Passenger
M – Mixed
S – Shunting
U – Multiple unit
R – Railcar
WAG-9
Locomotive class WAG-9 is a class of 25 kV AC electric locomotives that was developed by ABB Group for Indian Railways. The model name stands for broad gauge (W), AC Current (A), Goods traffic (G), with 9th generation locomotive. They serve the indian railway from 1996. Around 2145 WAG-9 have been built at Chittaranjan Locomotive Works and Banaras Locomotive Works, Bharat Heavy Electricals Limited and Diesel-Loco Modernisation Works. It was the most powerful freight locomotive of its fleet until the formal induction of the WAG-12.WAG-9 has quickly become one of the important locos in the Indian railways.
WAG-7
Locomotive class WAG-7 is a class of 25 kV AC electric locomotives that was developed by Chittaranjan Locomotive Works around 1990 for Indian Railways and serve the railway from 1992.The WAG-7 is one of the most successful locomotives of Indian Railways currently serving both for Goods and passenger
WAG-5
The Indian locomotive class WAG-5 is a class of 25 kV AC electric locomotives was developed by Chittaranjan Locomotive Works around 1968. The model name stands for broad gauge (W), alternating current (A), goods traffic (G) engine, 5th generation (5). They entered service in 1980. A total of 1196 WAG-5 were built at CLW and BHEL.
WAP-7
The Indian locomotive class WAP-7 is a class of 25 kV AC electric locomotives that was developed in the 1999 by Chittaranjan Locomotive Works (CLW) for Indian Railways. The model name stands for broad gauge AC Current Passenger engine, 7th generation . it was entered service in 2000. A total of 1329 WAP-7 have been built, with more units being built at CLW, Banaras Locomotive Works (BLW) and Diesel-Loco Modernisation Works.
The WAP-7 is one of the most successful locomotives of Indian Railways serving passenger trains for over 20 years. It is a passenger variant of the WAG 9 freight locomotive with a modified gear ratio to pull lighter loads at higher speeds. It is the most powerful passenger locomotive in the Indian Railways fleet, capable of hauling 24 coach trains at speeds 110–140 km/h.
WAP-5
One of the notable features of WAP-5 is regenerative braking.WAP-5 is the name of a class of "High Speed" electric locomotives produced and used by Indian Railways for passenger Train. The first 10 locomotives were imported from ABB in Switzerland . Other notable features of this loco are the provision of taps from the main loco transformer for hotel load, pantry loads, flexible gear coupling, wheel-mounted disc brakes, and a potential for speed enhancement to 200 km/h (120 mph).
WAP-4
The Indian locomotive class WAP-4 is a class of 25 kV AC electric locomotives that was developed by Chittaranjan Locomotive Works for Indian Railways. The model name stands for broad gauge AC Current Passenger traffic engine, 4th generation . They entered service in late 1994. A total of 773 WAP-4 were built at CLW, which made them the most numerous class of mainline electric passenger locomotive until the WAP-7
The WAP-4 is one of the most successful locomotives of Indian Railways serving both passenger and freight trains for over 26 years. This class provided the basic design for other locomotives like the WAP-6 . After the introduction of more modern types of locomotives like WAP-7, a significant number are still in use, both in mainline duties. As of January 2021, all locomotives except those lost in accidents still retain "operational status" on the mainline as WAP-4.
WDM-3A
The Indian locomotive class WDM-3A is a class of diesel-electric locomotive that was developed in 1993 by Banaras Locomotive Works, Varanasi for Indian Railways. The model name stands for broad gauge Diesel ( Mixed traffic engine, with 3300 horsepower (3A). The WDM-3A is a later classification of earlier WDM-2C. They entered service in 1994.
The WDM-3A is one of the most successful locomotives of Indian Railways serving both passenger and goods trains for over 26 years. A few WDM-3A units were exported to neighboring countries like Sri Lanka and Bangladesh. Despite the introduction modern types of locomotives like WDG-4 and electrification, a significant number are still in use, both in mainline and departmental duties.
WDM-3D
The Indian locomotive class WDM-3D is a class of diesel-electric locomotive that was developed by Banaras Locomotive Works (BLW), Varanasi for Indian Railways. The model name stands for broad gauge Diesel Mixed traffic engine with 3300 horsepower. The engine is classified WDM-3D though it outputs only 3300 hp and not 3400 hp as the name should suggest. They entered service in 2003. A total of 590+ WDM-3D were built at Banaras Locomotive Works (BLW), Varanasi between 2003 and 2016.
The WDM-3D is one of the most successful locomotives of Indian Railways serving both passenger and freight trains. A few WDM-3D units were exported or gifted to neighboring countries like Sri Lanka and Bangladesh. A significant number of these locomotives are still in use, both on mainline and departmental duties.
WDM-2
The Indian locomotive class WDM-2 is a class of diesel-electric locomotive that was developed by American Locomotive Company (ALCO) for Indian Railways. The model name stands for broad gauge Diesel Mixed traffic engine, 2nd generation. They entered service in 1962. A total of 2700+ WDM-2 was built at ALCO and Banaras Locomotive Works (BLW), Varanasi between 1962 and 1998, which made them the most numerous class of mainline diesel locomotive until its successor the WDM-3A.
The WDM-2 is one of the most successful locomotives of Indian Railways serving both passenger and Goods. A few WDM-2 units were exported to neighboring countries like Sri Lanka and Bangladesh.
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