LNER Thompson A2/2 class pacific No. 60506 Wolf of Badenoch with BR number and LNER on the tender. The location is Edinburgh's Haymarket shed.
Its BR number was applied in December 1948 whilst the date for the change to British Railways for 60506 can be reasonably assumed to be the June 1949 date that RCTS 2A gives for the painting out of the number on the bufferbeam. It is plausible that the tender was attended to at the same time.
60506 was a rebuild from Gresley's P2 class of 2-8-2's and remained a Scottish engine until moving south to Peterborough (New England mpd) in November 1949 from which shed withdrawal came in April 1961.