Koralm Railway Graz - Klagenfurt


ÖBB-Infrastruktur AG




2000 – 2024


Expert support in the fields of vibrations, noise, air quality

  • Expert support in the fields of vibrations, noise, air quality
  • Vibration, noise and air monitoring in the construction phase

Project objectives

The Koralm railway line is to connect the cities of Graz and Klagenfurt. The route is designed for a speed of 160 to 200 km/h, which allows to reduce the travel time from three hours to a mere one hour. The core of the connection between the capitals of the provinces of Styria and Carinthia will be the Koralm tunnel with a length of 33 km.

Project data

Length: 125.4 km (Graz main station – Klagenfurt main station)
Railway stations in Western Styria and Lavanttal valley, 11 stations
Underground section Feldkirchen – Graz airport: 3.2 km
Weitendorf underpass structure – A9: 1.2 km
Hengsberg tunnel: 1.695 km
Koralm tunnel: 32.894 km
Granitztal chain of tunnels: 2.55 km + 0.43 km + 3.096 km
Kühnsdorf chain of tunnels
Lind tunnel: 0.49 km
Grafenstein overhead noise barrier: 0.63 km

Project specifics

Longest newly constructed line in Austria.

Services of iC

Studies for environmental impact assessment and design for statutory procedures under the Federal Railway Act for the entire line including procedures according to the Austrian Waste Management Act (Hollenegg landfills)
Measurements during construction
Acceptance measurements before and after start of operation

Statutory procedure in Carinthia (Lavanttal railway station to Grafenstein railway station)
Measurements during construction

Air quality:
Statutory procedure for the Koralm tunnel, procedures according to the Austrian Waste Management Act for the Hollenegg landfills
Measurements during construction of the Koralm tunnel (lots KAT 1 and KAT 2), Grub landfill and Hollenegg landfills