Slight problem with either the date or the engine.
802 Tailte was withdrawn in 1955 and was supposed to have been cut-up by 1957 (only her tender still existed, and Bulleid reportedly wanted it for his turf-burning experiments). If this is correct, the engine in the photo either cannot be 802, or the given date of Jan. 1961 is wrong.
If it's 1961, my guess is that it's more likely to be 801 Macha which did linger around for a while after withdrawal.
It may not be 800 Maedb, since the few photos of her from that period (and after) show her looking relatively unweathered, and anyway she was not withdrawn until 1961 - although after that she was missing her plates and the cab windows prior to being set aside for preservation -