In Locomotives Illustrated no 60 GWR 0-4-2T, there are several photos of 58xx's. On page 23, there is 5811 ex-works, and unknown at Newcastle Emlyn c1947. On page 25, 5801 at Barmouth in 1956 still in GWR ownership in 1956 as well as 5816. On page 24, 5816 in early BR livery. Hope this helps.