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{{As of|2016}} D821 is undergoing an An overhaul at Old Oak Common which commenced in 2014.<ref>[http://www.svr.co.uk/MeetTheLoco.aspx?id=90 SVR meet the Locomotives]</ref>After a long period under repair at Old Oak Common (OOC) she returned to the SVR after the OOC open day in September 2017, before returning to use in April 2018 in time for the following month's Spring Diesel Festival.
Info added
|wheels = B-B
|power = Diesel Hydraulic
|status = Under overhaulOperational
|locono = D821
|designed = British Railways
|years4 = 2014
|events4 = Overhaul began at Old Oak Common
|years5 = 2018
|events5 = Returned to traffic
|length = 60ft
|weight = 78t
}}
The Post-War BR Modernisation Plan called for the introduction of a range of Diesel locomotives. Although the majority were diesel electric, the Western Region at Swindon developed the [[UIC classification | B-B]] diesel-hydraulic Class 42 ‘Warship’ class (all bar two of the class being named after Royal Naval vessels). D821 is one of two preserved examples of the 38 originally built.<ref name = "Wikipedia">Wikipedia</ref>
The last HMS Greyhound (H05) was a G-class destroyer, launched in 1935 and sunk by German dive bombers in 1941 in the battle for Crete, with the loss of 100 lives.<ref>[http://hmscavalier.org.uk/casualtySearch.php?surname=&forenames=&ship=greyhound&page=1 Casuaty Search] (Retrieved 24 July 2019)</ref> An earlier HMS Greyhound, a Greyhound-class destroyer, also saw service from 1900 to 1919. A number of other Naval vessels have also carried the name.<ref name = "Wikipedia" />
==D821 in service==
D821 Greyhound was outshopped from BR Swindon Works in May 1960, and served mainly at Plymouth Laira with brief spells at Newton Abbot.<ref>[http://www.brdatabase.info/locoqry.php?action=locodata&type=D&id=821&loco=821 BR Database]</ref> While in service D821 carried various liveries including green, maroon and blue. She was withdrawn from service in on 3 December 1972, with more than 1 million miles of main line working.<ref name = "SVR9">SVR Stock Book 9th Edition</ref> HMS Greyhound (H05) was a G-class destroyer, launched in 1935 and sunk by German dive bombers in 1941. An earlier HMS Greyhound, a Greyhound-class destroyer, also saw service from 1900 to 1919. A number of other Naval vessels have also carried the name.<ref name = "Wikipedia" />
==D821 in preservation==
D821 was bought by members of the [[Diesel Traction Group]], becoming the first main line diesel to be sold for preservation. In May 1973 D821 moved under her own power to Didcot, moving again in the following year to a private siding in Reading. Between February 1977 and April 1981 the locomotive underwent an overhaul at Swindon, and then moved to the North Yorkshire Moors Railway. She finally arrived on the SVR in September 1991.<ref name ="SVR9"/>
==See also==
[[Diesel Locomotives]]<br>[[SVR-based diesel locomotives visiting other events]]<br>[[Diesel Traction Group]]<br>[[Locomotive numbering|Locomotives running under different identities]]
==References==
==Links==
[https://en.wikipedia.org/wiki/British_Rail_Class_42 BR Class 42 on Wikipedia]<br>
[http://www.westernchampion.co.uk/loco-d821.php Diesel Traction Group website]<br>
{{DieselNavbox}}
[[Category:Featured articles]]
[[Category:Operational passenger hauling diesel locomotives]]