Indian locomotive class WAG-7

2021-06-02T02:44:01Z

2405:205:C860:C7DF:0:0:1571:A8A4:

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{{More citations needed|date=January 2021}}
{{Original research|date=January 2021}}
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{{Use dmy dates|date=January 2016}}
{{Use Indian English|date=January 2016}}
{{Infobox locomotive
| name = WAG-7
| image = BZA WAG7 28543.jpg
| caption = Vijayawada based WAG-7 hauling freight train
| powertype = Electric
| gauge = {{RailGauge|5ft6in|lk=on}}
| bogies = [[American Locomotive Company|ALCO]] Fabricated
| wheeldiameter = New:{{convert|1092|mm|ftin|abbr=on|frac=8}}, Half worn:{{convert|1055|mm|ftin|abbr=on|frac=8}} and Full worn:{{convert|1016|mm|ftin|abbr=on|frac=8}}
| wheelbase = {{convert|3.8|m|ftin|abbr=on|frac=8}}
| builder = WAG-7 & WAG-7H : [[Chittaranjan Locomotive Works]] (CLW) WAG-7 : [[Bharat Heavy Electricals Limited]] (BHEL).
| serialnumber =
| length = {{convert|20.934|m|ftin|abbr=on|frac=8}}
| width = {{convert|3.179|m|ftin|abbr=on|frac=8}}
| height = WAG-7 : {{convert|4.185|m|ftin|abbr=on|frac=8}}<ref name="Trainweb WAG-7">{{cite web|title=Trainweb WAG-7|url=http://trainweb.org/railworld/Electric_Locos/wag7.htm}}</ref> WAG-7H : {{convert|4.135|m|ftin|abbr=on|frac=8}}<ref name="Trainweb WAG-7H">{{cite web|title=Trainweb WAG-7H|url=http://trainweb.org/railworld/Electric_Locos/wag7h.htm}}</ref>
| totalproduction = WAG-7/7H: '''1970'''
| uicclass = Co′Co′
| axleload = WAG-7 : {{convert|20.5|t}} WAG-7H : {{convert|22|t}}
| factorofadhesion = 0.345
| locobrakes = [[Railway air brake|Air]], [[Parking brake#Railroad hand brakes|Hand]] and [[Rheostatic brake|Rheostatic]] (Friction)
| trainbrakes = [[Railway air brake|Air]], [[Vacuum brake|Vacuum]] and [[Vacuum brake#Dual brakes|Dual]]
| safety = Slip control, Main overload relay, Over voltage relay, No volt relay, Earth fault relay, Low pressure governor, Vacuum Control Governor, Train parting alarms and Brake cylinder cutoff valve
| electricsystem = {{25 kV 50 Hz}} [[Overhead line|Overhead]]
| collectionmethod = [[pantograph (rail)|pantograph]]
| multipleworking = 4
| poweroutput = Max : {{convert|5500|hp|kW|-1|abbr=on}} Continuous : {{convert|5040|hp|kW|-1|abbr=on}}
| locoweight = WAG-7 : {{convert|123|t}} WAG-7H : {{convert|132|t}}
| tractionmotors = WAG-7 : [[Hitachi]] HS15250A WAG-7H : [[Hitachi]] HS15250G
| maxspeed = WAG-7 and WAG-7H Design: {{convert|120|km/h|mph|0|abbr=on}} WAG-7H Actual: {{convert|120|km/h|mph|0|abbr=on}} Certified: {{convert|110|km/h|mph|0|abbr=on}}
| tractiveeffort = WAG-7 starting : 48 tons  WAG-7 continuous : 45 tons?  WAG-7H starting : 91 tons? 
| operator = [[Indian Railways]]
| fleetnumbers = WAG-7 : '''27001-27999''', '''28000-28770''', '''24501-24700''' WAG-7H : '''28024''' and '''28739'''
| nicknames = '''SHANTIDAN, EKTA, KARAMVIR, GAJRAJ, SWARNABHA, SARVOTTAM, SAMARPAN, CAUVERY, SAMRAT, PRAYAS & AGRASAR'''
| locale = All over [[India]]
| disposition = active
}}The Indian locomotive class '''WAG-7''' is a class of 25 [[Volt|kV]] [[Alternating current|AC]] [[electric locomotive]]s that was developed in the 1990 by [[Chittaranjan Locomotive Works]] for [[Indian Railways]]. The model name stands for [[5 ft 6 in gauge railway|broad gauge (W)]], alternating current (A), goods traffic (G) engine, 7th generation (7). They entered service in 1992. A total of 1970 WAG-7 were built at CLW and [[Bharat Heavy Electricals Limited|BHEL]] between 1990 to 2015, which made them the most numerous class of mainline electric locomotive till its successor the [[Indian locomotive class WAG-9|WAG-9.]]

The WAG-7 is one of the most successful locomotives of Indian Railways currently serving both freight and passenger trains for over 28 years. Even though with advent of new 3-phase locomotives like [[Indian locomotive class WAG-9|WAG-9]] and [[Indian locomotive class WAG-12|WAG-12]], all WAG-7 locomotives except one destroyed in accidents, rest are in service and doing all types of duties.

== History ==
The history of WAG-7 begins in the early 1990s with the aim of addressing the shortcomings of the previous [[Indian locomotive class WAG-5|WAG-5]] class and remove [[steam locomotive]]s from IR by a target date of 1990.<ref>{{Cite web|title=Report of the expert Committee on Coal Consumption on Railways, 1958|url=http://www.indianculture.gov.in/report-expert-committee-coal-consumption-railways-1958|access-date=2020-04-29|website=INDIAN CULTURE|language=en}}</ref> The WAG-5 though were great successes, had become underpowered to meet the growing demands of the Indian Railways. So in early 1990s IR decided to look for a successor the WAG-5 class. The required specification was of a 5000 horsepower locomotive.

Initially, the Indian railways invited tenders to build locomotives to the new specification. The following responses were received:

* CLW submitted their upgraded WAG-5 model with 5000 hp with Co-Co bogies.
* BHEL submitted a 5000 hp locomotive with [[Thyristor|thyristors control]] and Co-Co bogies.

Each company submitted their prototypes and Indian Railways designated these prototypes as the WAG-7 class and [[Indian locomotive class WAG-8|WAG-8]] class respectively.<ref>{{Cite web|title=[IRFCA] Indian Railways FAQ: Locomotives - General Information - I|url=https://www.irfca.org/faq/faq-loco.html#class|access-date=2020-04-18|website=www.irfca.org}}</ref> Technologically thyristor controlled BHEL WAG-8 was meant to be superior to the WAG-7 which was effectively using [[Tap changer|tap-changer]] technology from the 1960s. But due to issues from WAG-8, WAG-7 was selected for mass production.

However, even before the WAG-7 another type of electric locomotive was imported from [[ASEA]] in 1988. This locomotive was classified as [[Indian locomotive class WAG-6A|WAG-6A]]. However WAG-6As were not selected for mass production because emergence of [[Indian locomotive class WAG-9|3 Phase AC locomotives]].<ref>{{Cite web|date=2013-10-30|title=The WAG Series|url=https://24coaches.com/indian-railways-wag-series/|access-date=2020-04-29|website=24 Coaches|language=en-US}}</ref>

==See also==

*[[Indian Railways]]
*[[Locomotives of India]]
*[[Rail transport in India]]

==References==
<references/>

==External links==
{{commons category|Indian locomotive class WAG7}}
*[http://www.irfca.org/faq/faq-specs.html#WAG-9 Specifications]
*[http://www.irfca.org India railway fan club]

{{Broad gauge locomotives of India |state=collapsed}}

[[Category:Electric locomotives of India]]
[[Category:25 kV AC locomotives]]
[[Category:Co-Co locomotives]]
[[Category:5 ft 6 in gauge locomotives]]
[[Category:Railway locomotives introduced in 1992]]
[[Category:BHEL locomotives]]
[[Category:Chittaranjan Locomotive Works locomotives]]

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Indian locomotive class WAG-7