A Driving Brake Standard Open (DBSO) is a type of railway carriage in the United Kingdom, converted to operate as a control car; this is not to be confused with DVTs, such as those in InterCity 225 sets.

Numbers 9701–9710 were converted in 1979 for use on the newly introduced Glasgow–Edinburgh InterCity ScotRail push–pull service with specially modified Class 47/7 locomotives.

[citation needed] In the late 1980s, with the introduction of Class 158 diesel multiple units on the Glasgow–Edinburgh corridor, the DBSO fleet was transferred en-masse, and converted to use the TDM system used by the AC electric locomotives used on the London Liverpool Street to Norwich services on the newly electrified Great Eastern Main Line.

The Mark 2E/2F coaching stock used on the route was based at Crown Point TMD and rakes were marshalled into semi-permanent formations (numbered AR01–AR13).

The thirteen surviving DBSOs were still in service, although they were gradually replaced by Driving Van Trailers (cascaded from Virgin Trains).

DBSO 9713 was preserved for further use on the Mid-Norfolk Railway, although this was later sold to Direct Rail Services and scrapped following component recovery.

[4] Ex Anglia MK2 driving trailer 9712 was sold to Northern Ireland Railways for use on the ex Gatwick set to convert it to push–pull operation using 111 class locomotives.

[7] On 18 October 2022, Locomotive Services Group revealed that 9707 had been repainted back into its 1980s ScotRail livery; it is expected that it will operate its first charter train in early 2023, as part of a six-coach set, with 47712 Lady Diana Spencer.