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|status = Under overhaulOperational

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 She was withdrawn from service in on 3 December 1972, with more than 1 million miles of main line working.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>  ==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 from Laira to Didcot, another first as a preserved private owner loco running on the main line under its own power, before the ban on such running was imposed. It moved again in the following year to the private Kings Meadow sidings just east of Reading station, in the Reading Gas Works site, where it was a notable sight from trains passing on the nearby Great Western main line. From 1975 it was in the company of the DTG's [[BR Class 35 D7029]].

HMS Greyhound (H05) was a G-class destroyerBetween February 1977 and April 1981 the locomotive underwent an overhaul at Swindon, launched in 1935 and sunk by German dive bombers in 1941. An earlier HMS Greyhound, a Greyhound-class destroyer, also saw service from 1900 then moved to 1919the North Yorkshire Moors Railway. A number of other Naval vessels have also carried It finally arrived on the nameSVR in September 1991.<ref name = "WikipediaSVR9" />

==D821 An overhaul commenced in preservation2014.<ref>[http://www.svr.co.uk/MeetTheLoco.aspx?id==D821 was bought by members of 90 SVR meet the Locomotives]</ref> After a long period under repair at Old Oak Common (OOC) it returned to the SVR after the OOC open day in September 2017<ref>[[Diesel Traction Group]http://www.bropendays.co.uk/oldoak2017.html BR Open Days.co.uk](Retrieved 4 June 2023)</ref>, becoming the first main line diesel before returning to be sold use in April 2018 in time for preservation. In May 1973 D821 moved under her own power to Didcot, moving again in the following year to a private siding in Readingmonth's [[Diesel galas|Spring Diesel Festival]]. Between February 1977 and April 1981 the locomotive underwent an overhaul at Swindon From 2021 it saw extensive bodywork repairs, replacement of primary suspension springs, and then moved attention to the North Yorkshire Moors Railwaybrake system and a repaint into BR Blue with full yellow ends. She finally arrived on the <ref>SVR in September 1991News 218, Summer 2022, p.23</ref name ="SVR9"/>It returned to traffic for the 2023 Spring Diesel Festival.

{{As of|2016}} D821 is undergoing an overhaul at Old Oak Common which commenced in 2014.<ref>a popular [[http://www.svr.co.uk/MeetTheLoco.aspx?id=90 SVR meet the Locomotives-based diesel locomotives visiting other events|visitor to other heritage railways]</ref>].

[[Diesel Locomotives]]<br>[[SVR-based diesel locomotives visiting other events]]<br>[[Diesel Traction Group]]<br>[[Locomotive numbering|Locomotives running under different identities]]