One of the panniers built with riveted tanks.

Peter Kerslake adds "With Port Talbot being the centre for steel production over many years it was the need for a substantial Motive Power Depot that resulted in the Port Talbot Railway building such a facility in 1896 .
The original five road shed was enlarged by the G.W.R. in 1931 , the Depot boasting over fifty locomotives in its heyday, many being Pannier Tanks as seen here, but larger classes of locomotives were also housed there. The barren hills in the background are in contrast to the gas holders and steel mills behind the cameraman .
Duffryn Yard Depot closed in March of 1964 and was demolished not long afterwards.
Located just above Port Talbot and sheltered by the rolling hills of Myndd Margam seen here this view, part of Duffryn Yard Depot is shown here from the eastern side of that location as the western aspect would have shown the heavily industialised steel production area and all the gas holders, chimneys and the like associated with steel production, the source of most of the rail freight traffic handled from this Depot in this area at that time.
The locomotives seen here could well have run their last such duty as 8746 certainly was withdrawn the previous December and has no coal in her bunker, so they may well all be awaiting their fate in this 1963 view.
The original Motive Power Depot dated back to 1896 when the Port Talbot Railway established a five road facility here with the Depot being enlarged in 1931 when the Great Western added a sixth track into the enlarged facility.
In its heyday the Depot had some fifty or more locomotives on its books, mainly Tank Engines and especially Pannier Tanks, but there were also a number of the massive Heavy Welsh Tank engines here together with a number of the "2800" class working from Duffryn Yard before the establishment was closed in March of 1964."