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[[File:{{Infobox wagon|image = GWR 94059 China Clay Open Wagon.jpg|thumb|300px|right|caption = GWR 94059 China Clay Open Wagon|construc = GWR Swindon|status = Operational|wagno = 94059|othernos = PBA 58028|designed = |diagram = O13|lot = 777|wagtype = 4w 5-plank tippler|capacity = 12 tons|telcode = CLAY (after 1943)|topscode = OWO|brakes = DCII|built = 1914|years1 = 1975|events1 = Arrived on SVR|years2 = |events2 = |years3 = |events3 = }}94059 is one of 500 built at Swindon in 1914 to Diagram O13, Lot 777. It is a 4-wheeled 5-plank open tippler wagon with a capacity of 12 tons. The wagons were used until the 1950s to haul china clay from Cornwall to the Staffordshire potteries, and accordingly were latterly given the telegraphic code 'CLAY'. In service they were fitted with zinc-lined floors, as the normal wooden floor of a wagon could stain the clay. An end door allowed the clay to be tipped, but side doors were also fitted to allow barrels of clay to be loaded if required. They were originally fitted with DCII brakes, later converted to a GWR Morton-type ‘lever each side’ pin-down arrangement to comply with the 1939 MOT right hand brake lever ruling.<ref >[[Bibliography#Other References|Atkins, Beard & Tourret (2013)]]pp. 10, 28, 304.</ref>

94059 is one was sold to the Port of 500 built at Swindon Bristol Authority in 1914 to Diagram O131958 for use on the Avonmouth Docks internal system, Lot 777where it was numbered PBA 58028. It is a 4-wheeled 5-plank open tippler wagon with a capacity of 12 tons. The wagons were used until the 1950s to haul china clay was acquired from Cornwall to the Staffordshire potteriesthere, and accordingly were given arriving on the telegraphic code 'Clay'SVR on 8 September 1975. In service they <ref>SVR Stock Book Ninth Edition</ref> Some body repairs were fitted carried out shortly after arrival.<ref>SVR News 39</ref> It ran for some time under the false number 97393 but was repainted with zinc-lined floors, as the normal wooden floor of a wagon could stain the claycorrect number in 1982.<ref>SVR News 66</ref>

In 1985, 94059 appeared on the main line when it was sold used in the [[The Severn Valley Railway on the main line#SVR Wagons used on the main line in preservation| GW 150 demonstration freight train]] which ran to Newport behind [[2857|GWR freight loco 2857]].<ref>SVR News 78</ref> In June 1990, 94059 and [[Cadbury's 346 Goods Van]] were included in the demonstration goods train for the Port "Heavy Freight Weekend" event. A number of Bristol Authority in 1958 for use the wagons were derailed on trap points at the north end of Bridgnorth station at the Avonmouth Docks internal system, where it end of the event and both wagons suffered damage. 94059’s bodywork was already in poor condition and an overhaul was numbered PBA 58028undertaken the following year. It was acquired from there, arriving on This included complete replacement of body timbers and the curb rail.<ref>SVR on 8 September 1975News 96, 98, 102</ref>  A further overhaul was carried out in 2011. The second-hand floor planks used in 1991 were replaced with new keruing and a number of other planks were also replaced. The brakes were restored to the original as-fitted DCII arrangement using a mixture of spare components and newly fabricated parts.<ref>SVR News 175</ref>  94059 is owned by [[The GWR 813 Preservation Fund]].