Former Taff Vale Railway class O4 0-6-2T no. 211 at Swindon works on 20/6/55. For whatever reason, according to the notes I have here, no. 211 hung around doing nothing after withdrawal t 88B Cardiff East Dock shed in May 1955 until April 1956 when it's known to have been the works pilot there for just that month.
[Mike Morant collection]