Powis was chairman of the Shropshire Union Railways and Canal Company and of Welshpool Gas Company, who provided gas-lighting in Welshpool town.
The Shropshire Union Railways and Canal Company was a Company in England, formed in 1846, which managed several canals and a railway.
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Jebb was later appointed as the Chief Engineer of the Shropshire Union Railways and Canal Company (for whom he designed many of the docks and warehouses of Ellesmere Port) and of the Birmingham Canal Navigations and was a director of the Glyn Valley Tramway.