BR Mark 1 Corridor Second (SK) 25771 was built at Derby in 1961 to diagram number 146 of lot number 30685.
25771 arrived on the SVR in September 1986 from London’s Old Oak Common, courtesy of the 75069 Fund. It was formerly part of the BR Maroon running set but has spent some time in Kidderminster Carriage Works, having been photographed there in 2007 for the Railway Heritage Register Carriage Survey and in May 2015 on Facebook.
In 2015 it was thoroughly overhauled at Kidderminster Carriage works and outshopped in a later variant of BR maroon livery-that with maroon ends. For the present its primary function is to replace vehicles under overhaul from Set N, but once completed this very useful carriage is certain to quickly find other work.
Sources
Railway Heritage Register Carriage Survey
SVR Stock Book Ninth Edition
Links
25771 on vintagecarriagestrust.org
Photos from Richard Herington's post
Photos from Sharpo's World 2002 and 2005