León–Asturias High-Speed Line. La Robla–Pola de Lena
BUSINESS AREA:  Construction
PROJECT TYPE:  Railway tunnels
START DATE:  06 / 2006
END DATE:  06 / 2011
CLIENT:  Administrador de Infraestructuras Ferroviarias (ADIF)
LOCATION:  León (Spain)
LENGTH:  4.204,00 m.
SECTION:  85 y 90 m²