REFER, Rede Ferroviária Nacional, EP (i.e. National Railway Network) was the Portuguese rail infrastructure manager. It was a state-owned company and was created to manage the Portuguese rail infrastructure, previously under control of CP, which became exclusively a train service operator. It was incorporated on 29 April 1997 by government decree no. 104/97 and was 100% owned by the Portuguese state. All duties and competences of Estradas de Portugal and REFER, EP, have therefore been transferred to Infraestruturas de Portugal.