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{{Use Indian English|date=May 2020}}
{{Use mdy dates|date = May 2020}}
{{Infobox locomotive
| name = Indian locomotive class WDS-8
| powertype = Diesel
| image = File:WDS-8.jpg
| alt =
| caption = A brand new WDS-8 (possibly #001) at [[Chittaranjan Locomotive Works|CLW]], after completion
| builder = [[Chittaranjan Locomotive Works|CLW]]
| ordernumber =
| serialnumber =
| buildmodel =
| builddate = 1979-1982
| totalproduction = 5
| rebuilder =
| rebuilddate =
| numberrebuilt =
| Britishclass = [[Bo-Bo locomotives|Bo-Bo]]
| uicclass = [[Bo′Bo′]]
| gauge = {{RailGauge|1676mm|lk=on}}
| trucks =
| bogies =
| wheeldiameter = {{convert|1092|mm|ftin|0|abbr=on}}
| trailingdiameter =
| minimumcurve =
| wheelbase = {{convert|10.834|m|ftin|abbr=on|frac=8}}
| length =
| width = {{convert|2.764|m|ftin|abbr=on|frac=8}}
| height = {{convert|4.195|m|ftin|abbr=on|frac=8}}
| axleload =
| weightondrivers =
| locoweight = {{convert|73000|kg|abbr=on}}
| fueltype = [[Diesel fuel|Diesel]]
| fuelcap = {{convert|1000|L|abbr=on}}
| lubecap = {{convert|530|L|abbr=on}}, {{convert|630|L|abbr=on}} DLW
| coolantcap =
| watercap = {{convert|20|L|abbr=on}}, {{convert|28|L|abbr=on}} DLW
| sandcap =
| consumption =
| watercons =
| primemover = MAK 800hp diesel engine
| rpmrange =
| enginetype = [[Straight-six engine|Inline-6]] [[Diesel engine|diesel]]
| aspiration = [[Turbo-supercharger|Turbo-supercharged]]
| displacement =
| alternator =
| generator = DC
| tractionmotors = 6 DC
| cylindercount = 6
| cylindersize =
| transmission =[[Diesel-electric transmission]]
| multipleworking =2
| maxspeed = {{convert|35|km/h|0|abbr=on}}
| poweroutput = Max: {{convert|800|HP|abbr=on}}<br>Site rated: {{convert|700|HP|abbr=on}}
| tractiveeffort ={{convert|22.000|t|0|abbr=on}} maximum, {{convert|16.050|t|0|abbr=on}} continuous
| factorofadhesion =
| trainheating =
| locobrakes = [[Railway air brake|Air]], [[Vacuum brake|Vacuum]]
| locobrakeforce =
| trainbrakes = [[Vacuum brake|Vacuum]] , [[Railway air brake|Air]]
| safety =
| operator =[[Steel Authority of India]]
| operatorclass =
| powerclass =
| numinclass =
| fleetnumbers =
| officialname =
| nicknames =
| axleloadclass =
| locale = Leased and sold to some industrial concerns
| deliverydate =
| firstrundate = 1972
| lastrundate =
| retiredate =
| withdrawndate =
| preservedunits =
| restoredate =
| scrapdate =
| currentowner = [[Steel Authority of India]]
| disposition = Withdrawn from service, scrapped
}}

The Indian locomotive class '''WDS-8''' is a class of [[diesel-electric locomotive]] that was developed in 1979 by the [[Chittaranjan Locomotive Works]] for [[Indian Railways]], but ended up being delivered exclusively to the private sector. The model name stands for [[5 ft 6 in gauge railway|broad gauge (W)]], Diesel (D), Shunter (S) engine, 8th generation (8). They entered service in 1979. A total of five WDS-8 locomotives was built at [[Chittaranjan Locomotive Works]] (CLW), Varanasi between 1979 and 1982.

All WDS-8 units were exported to the [[Steel Authority of India]]. As of November 2020, these locomotives have been withdrawn from service.

== History ==
The history of the WDS-8 class begins in the early 1970s with the Railway Board's dual aims of addressing the shortcomings of the previous class of shunter/switcher locomotive ([[Indian locomotive class WDS-4|WDS-4]]) and of removing all of Indian Railways' [[Steam locomotive|steam locomotives]] from operational service by a target date of 1990. The WDS-8 was a competing bid from CLW to the [[Banaras Locomotive Works]]'s [[Indian locomotive class WDS-6|WDS-6]] class, intended for industrial concerns in the private sector as well as for the Railways itself.<ref>{{Cite web|title=[IRFCA] Indian Railways FAQ: Diesel and Electric Locomotive Specifications|url=https://www.irfca.org/faq/faq-specs.html#WDS-8|website=www.irfca.org|access-date=2020-05-22}}</ref> The WDS-8 had a MAK diesel engine with a maximum output of 800 HP which was similar to the engine used in the newly upgraded YDM-1 class. They possessed short cabs modeled on those of CLW's electric locomotives with a single long, narrow hood. But unfortunately, this design was severely underpowered compared to the WDS-6 class.<ref>{{Cite web|title=[IRFCA] Indian Railways FAQ: Locomotives -- Specific classes : AC Electric|url=https://www.irfca.org/faq/faq-loco2d.html|website=www.irfca.org|access-date=2020-05-22}}</ref>

As a result of these shortcomings, CLW decided not to produce any more WDS-8 locomotives after these 5 units and they were then transferred to the plants of the [[Steel Authority of India]] (SAIL).<ref>{{Cite web|title=[IRFCA] Indian / South-Asian Industrial Locos : Builders: Chittaranjan Locomotive Works|url=https://www.irfca.org/docs/locolists/industrial/display.php?file=builder-CLW.txt&title=Builders:%20Chittaranjan%20Locomotive%20Works|website=www.irfca.org|access-date=2020-05-22}}</ref>

As of November 2020, no locomotives of this class are in service.

==See also==

* [[History of rail transport in India]]
* [[Locomotives of India]]
* [[Rail transport in India]]

==References==

===Notes===
{{reflist}}

===Bibliography===
{{refbegin}}
*{{Hughes-IndianLocos4}}
{{refend}}

{{Broad gauge locomotives of India |state=collapsed}}
[[Category:Bo-Bo locomotives]]
[[Category:Chittaranjan Locomotive Works locomotives]]
[[Category:Railway locomotives introduced in 1979]]
[[Category:5 ft 6 in gauge locomotives]]
[[Category:Diesel-electric locomotives of India|S-8]]

Indian locomotive class WDS-8 - Revision history

>Vatsmaxed at 10:45, 12 December 2020