Jelaskan Spain dari Lebar sepur ganda

In Spain, there is  of dual gauge in the AVE line from Zaragoza to Huesca, usable for both  standard-gauge high-speed trains and  Spanish network trains. Some dual-gauge  sidings are at Port Bou on the French border. In 2009, Adif called for tenders for the installation of a third rail for standard-gauge trains on the  between Castellbisbal and the Can Tunis freight terminal in Barcelona.