After 25 years, even the best radio technology reaches the end of its lifecycle – and this is precisely the case with the tunnel radio system of the S6 Semmering Tunnel Chain, originally installed by us under the name Center Communication Systems. We are pleased to announce that STRABAG Infrastructure & Safety Solutions (SISS) has been awarded the contract for the complete renewal of the radio system, with a project volume of approximately € 5.2 million.
As part of the project, the Semmering, Steinhaus, Spital, and Ganzstein tunnels – with a total length of 10 km – will be refurbished, and the entire technical infrastructure will be renewed over four construction phases starting in mid-2025.
For us at STRABAG Infrastructure & Safety Solutions, this specifically means:
- Renewal of the tunnel radio center
- Construction of new radio repeater stations
- Ensuring the supply of 28 cross-passages between the tunnel tubes
- Installation of around 47 km of radiating cable and 6 km of coaxial cable
SISS as General Contractor
The contract to renew the radio system was awarded by ASFiNAG as part of an independent general contractor tender. As such, we at STRABAG Infrastructure & Safety Solutions are not only responsible for supplying the new system, but also for dismantling the old one, as well as carrying out all installation and cabling work.
During each of the four construction phases, one tube of two tunnels will be closed to traffic and refurbished. Throughout the works, radio coverage must be maintained at all times for the operational traffic lanes. In addition, provisional radio services will be set up in the closed tubes to ensure communication for emergency services.
Under the project management of Manfred Bedrnik and the technical leadership of Martin Kiss, our team is already working on the necessary temporary arrangements for the first construction phase, alongside overall project planning, which began in early May 2025.
Following the scheduled completion in July 2029, the tunnel radio system will once again reflect the latest state of the art and comply fully with modern safety standards – helping to protect approximately 8 million road users each year.