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LNER Gresley Tourist Open Third (TTO) No 24105 was built 1936 by the Birmingham Railway Carriage and Wagon Company (BRCW). It seated 64 passengers in one large saloon, with an entrance vestibule at each end and two toilets at one end. Officially these carriages were meant for excursion work, but most of them seem to have quickly gravitated into general passenger service.  ==Service==24105 was renumbered as 13317 as part of the LNER's 1943 re-numbering scheme. On Nationalisation in 1947, BR initially allocated an E prefix to indicate its LNER origin, with a further re-numbering to E13313E after 1951.<ref>[[Bibliography#Other References|Longworth (2018)]] p.175.</ref> It was withdrawn from passenger use in 1961 to be modified to act as the control and apparatus car in a mobile control train for use in the event of war . It was given the Departmental number DE320957 from June 1963<ref>[[Bibliography#Other References|Longworth (2018)]] p.473.</ref> and was based at York with [[LNER 43600 Open Third]]. The modification included the blanking out of many windows and the fitting of double doors to one side.