| Soon this view in the mountains is gone: The Pajares Base Tunnelis a twin pair of railway tunnels beneath the Puerto de Pajares pass in the Cantabrian Mountains, Spain. Once completed end of year 2023, the 24,667 m / 80,928 ft length tunnel will form a key portion of the high-speed rail line between León and Gijón, and shall be used by both high speed passenger trains as well as by slower freight trains. |