News

Rehabilitation work in the Kerenzerberg Rail Tunnel was successfully completed at the end of 2023.
The Kerenzerberg tunnel, owned and operated by the Swiss Federal Railways (SBB), is a 3,959 m long twin-track railway tunnel built in 1961. Located in northeast Switzerland, the tunnel is a very important link for domestic and international passenger and freight traffic.

Between August and December 2023, rehabilitation work was carried out to repair wet and dripping spots in the concrete vault and to reduce the amount of mountain water pressure being applied to the vault and to construction joints due to sintered mountain water drainage pipes.
The work was carried out by Fretus AG during the night. Most of the time, only one track was closed, allowing rail traffic to continue running on a single track. The work was completed on time and within budget.

ILF was responsible for the design and the supervision of the site during the rehabilitation work. Many thanks to all involved for the successful and accident-free completion of the project.