[[File: {{Infobox diesel loco|image = D821_20110522.jpg |caption = D821 Greyhound at Bridgnorth in 2011|construc = BR Swindon Works|thumbwheels = B-B|200pxpower = Diesel Hydraulic|rightstatus = Under overhaul| locono = D821 Greyhound]]|designed = British Railways|locotype = '''Class 42'''|built = 1960|years1 = 1973|events1 = Purchased by precursors of the Diesel Traction Group|years2 = 1981|events2 = Overhauled at Swindon|years3 = 1991|events3 = Arrived on SVR|years4 = 2014|events4 = Overhaul began at Old Oak Common|length = 60ft|weight = 78t}}
==D821 in service==
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).
