SBB will be renovating the 8.134-kilometre-long, two-lane Hauenstein Base Tunnel in Switzerland for the upcoming five years to ensure safe rail operations over the next 25 years. This 146.4 million euro project, involving a comprehensive repair of the tunnel vault, renewing or replacing the tracks including rails, sleepers and ballast, and laying new cables, requires SBB to adapt the train traffic timetables.