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'''BR Mk 3a coaching stock ''' entered service between 1975 and 1988. It featured a monocoque construction with an all-welded mild steel stressed skin, and was air-braked. These features make it unsuitable for operational use on a heritage railway such as the SVR. However the SVR has acquired a number of Mk 3a Convertible Sleeper carriages which are used as temporary accommodation. They are of two varieties, the Sleeper Either class (SLE) and the Sleeper Either class with Pantry (SLEP). ==Current Mk 3a coaching stock=={{As of|2020}} there are three Mk III sleepers still present on the SVR:

<gallery>File: BR_10569_20150320.jpg|10569File: BR_10696_20150320.jpg|10696File: BR_10713_20150402.jpg|10713</gallery> ==Former Mk 3a coaching stock== Two other Mk 3a Convertible Sleepers were previously resident but have since been scrapped: *10677: This vehicle reportedly arrived on the SVR circa 2010.<ref>[http://www.cs.rhrp.org.uk/se/CarriageInfo.asp?Ref=5257 Railway Heritage Register Carriage Survey 10677]</ref> It was stripped for spares at Kidderminster, the body leaving by low loader in April 2014 for cutting up at Lye.<ref>[https://forum.svr-online.org.uk/viewtopic.php?t=1790&postdays=0&postorder=asc&start=15 SVR forum]</ref><ref Name=DW>Confirmed by David Williams, 15 January 2020</ref>*10606: SLEP built in 1982 at Derby.<ref>[http://www.cs.rhrp.org.uk/se/CarriageInfo.asp?Ref=3520 10606 on Railway Heritage Register On-Line]</ref> Photographed at Kidderminster in 2015 (see below), it has since been stripped for spares and sent to Kingsbury for cutting up.<ref Name=DW/> <gallery>File: BR_10606_20150503.jpg|10606</gallery> ==Northern BelleMk 3a coaching stock==