WAP-7 class electric locomotive of Indian Railways.jpg
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The Indian locomotive class WAP-7 is a class of 25 kV AC
electric locomotives An electric locomotive is a locomotive powered by electricity from overhead lines, a third rail or on-board energy storage such as a battery or a supercapacitor. Locomotives with on-board fuelled prime movers, such as diesel engines or gas t ...
that was developed in 1999 by Chittaranjan Locomotive Works (CLW) for Indian Railways. The model name stands for broad gauge (W), AC Current (A), Passenger traffic (P) engine, 7th generation (7). They entered service in 2000. A total of 1424 WAP-7 have been built, with more units being built at CLW, Banaras Locomotive Works (BLW) and Patiala Locomotive Works (PLW). The WAP-7 is one of the most successful locomotives of Indian Railways serving passenger trains for over 22 years. It is a passenger variant of the WAG-9 freight locomotive with a modified gear ratio to pull lighter loads at higher speeds. With an output of , it is the most powerful passenger locomotive in the Indian Railways fleet, and the most numerous passenger locomotive in India. The WAP-7 is capable of hauling 24 coach trains at speeds .


History

It is now largely used by Northern Railways (NR),
South Central Railways The South Central Railway (abbreviated SCR) is one of the 19 zones of Indian Railways. The jurisdiction of the zone is spread over the states of Telangana, Maharashtra, Karnataka, Andhra Pradesh. It has three divisions under its administrati ...
(SCR), Central Railways (CR),
South East Central Railways South is one of the cardinal directions or compass points. The direction is the opposite of north and is perpendicular to both east and west. Etymology The word ''south'' comes from Old English ''sūþ'', from earlier Proto-Germanic ''*sunþaz ...
(SECR), South Eastern Railways (SER), West Central Railways (WCR),
Eastern Railways The Eastern Railway (abbreviated ER) is among the 19 zones of the Indian Railways. Its headquarters is at Fairley Place, Kolkata and comprises four divisions: , , , and . Each division is headed by a Divisional Railway Manager (DRM). The name o ...
(ER), Western Railways (WR), North Central Railways (NCR),
South Western Railways South is one of the cardinal directions or compass points. The direction is the opposite of north and is perpendicular to both east and west. Etymology The word ''south'' comes from Old English ''sūþ'', from earlier Proto-Germanic ''*sunþaz ...
(SWR), Southern Railways (SR), East Central Railways (ECR), East Coast Railways (ECoR),
North Eastern Railways The North Eastern Railway (abbreviated NER) is one of the 19 railway zones of Indian Railways in India. It is headquartered at Gorakhpur. Zonal Rail Training Institute (ZRTI) is established in district Ghazipur, Uttar Pradesh. North Eastern ...
(NER) etc among other zones. As of October 2021, all of which are fitted with H-type transition couplers which are compatible with both
screw coupling Buffers and chain couplers (also known as "buffers and screw", "screw", "screwlink", and "English" couplers) are the de facto UIC standard railway stock coupling used in the EU and UK, and on some surviving former colonial railways, such as in ...
and centre-buffer coupling. In February 2017, Banaras Locomotive Works built their first WAP 7 class locomotive. In 2019, a variant of the WAP-7, designated the WAP-7HS, was introduced for higher speeds. The WAP-7HS has a max speed of , and is capable of hauling a 24-car train at as opposed to the of the original. Indian Railways plans to use the WAP-7HS for Shatabdi, Rajdhani, and Duronto express trains. However, as of September 2022, it has not been confirmed if any others have been built, and the single completed WAP-7HS has stayed restricted to .


Head-on Generation (HOG)

A main feature of Majority locomotives of this class is that they eliminate the need to have separate End on Generation (EOG) sets or DG (Diesel Generator) sets for supplying power to the train resulting in significant savings on maintenance and running costs. This technology, called HOG or "Head On Generation", transfers electric power from the loco's pantograph to the coaches instead of EOG where a power car equipped with diesel generator capable of generating adequate power of 3-phase 50 Hz 415 V / 750 V AC (called ' head-end power') is provided at either end of the train rake to supply power.


Locomotive sheds


See also

* Indian Railways *
Locomotives of India The Indian Railways primarily operates fleet of electric and diesel locomotives, along with several compressed natural gas (CNG) locomotives. Steam locomotives are operated on a few World Heritage Sites and also run occasionally as herita ...
* Rail transport in India


References


External links

{{DEFAULTSORT:Indian Locomotive Class Wap-7 5 ft 6 in gauge locomotives 25 kV AC locomotives Co-Co locomotives Electric locomotives of India