Internal user wagons at Stocksbridge UES steel works. The Pencil mould ingot carrier built by Chas Roberts in 1961. Panzer is the nickname of heavily constructed for ingots. Ingot moulds are part of the production process and various types of wagons are used internally to transfer ingots of steel. Robin Idle added The flat wagons are carrying ingots (6 ton ingots I think, they have a straight taper), not ingot moulds. The moulds are hollow as in your photo of nos 315 and 316. These are used in the upright position on the ingot mould carriers (bogies) when the metal is being cast. The ingot is then removed and the mould returned to the casting shop preparation area. The mould carriers are generally only seen near the casting shop. Noticeably, the Panzers do not have bright rust, but an unusually subdued finish. I have deliberately left a lot more background on these photographs than I usually do, as they show many aspects of the steelworks.