Details are; Built 1/1878
B4 boiler 1/1925
Pannier tanks 2/1925
Withdrawn 4/1946

Sheds
1921 Duffryn
1922 Llanelly
1934 Pantyffynon
last shed Leamington

I suspect this is taken at Llanelly

There's a picture of this loco as a saddle tank in 1923 in GWR Journal No3