Tanganyika Concessions Limited (TCL or Tanks) was a British mining and railway company founded by the Scottish engineer and entrepreneur Robert Williams in 1899.The purpose was to exploit minerals in Northern Rhodesia and in the Congo Free State.Partly-owned subsidiaries included the Union Minière du Haut-Katanga (UMHK), which undertook mining in the Katanga portion of the copperbelt, and the Benguela railway, which provided a rail link across Angola to the Atlantic Ocean. Belgian banks eventually took over control of the company.The Angolan railway concession was returned to the state of Angola in 2001.