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==Service==
All four coaches were built at Swindon in 1939 as part of lot number 1593 to diagram number C77, with 1146 entering service in August of that year. <ref>[[Bibliography#Other References|Longworth (2018)]] p.55.</ref> Under BR, the coach initially became W1146 at nationalisation and W1146W following the introduction of BR Mk 1 coaches in accordance with the normal BR renumbering process.
1146 continued in passenger service in the BR Western region until April 1965, when it withdrawn and transferred into [[Carriage and Wagon numbering# Internal User vehicles|Internal User stock]] as number 079153. It then formed part of GWR's 9-coach '''Swindon test train''' which was used for load testing of diesel locomotives, the full list of coaches being:
