Query: What is the name of its only electrified railway?
Context: A 1,000 mm (3 ft 3 3⁄8 in) metre gauge line operated by FEVE connects Ferrol to Ribadeo and Oviedo. The only electrified line is the Ponferrada-Monforte de Lemos-Ourense-Vigo line. Several high-speed rail lines are under construction.