The 50km Pajares bypass connects La Robla with Pola de Lena and will eventually form part of the León – Asturias high-speed line. In the first phase, Siemens will equip the line with Asfa, while in the second phase Thales will install ERTMS Level 2 to enable trains to operate at up to 350km/h.

The contract also includes installation of centralised traffic control (CTC), fixed telecommunications, access control, CCTV, and connections to the existing Venta de Baños – Gijón broad-gauge line, as well as equipment maintenance.