After a total of 30 years' use, both the quality of the under ballast mats and the structure-borne noise in the Philharmonic Hall were examined. Getzner performed a number of tests under the supervision of Deutsche Bahn AG – the German national rail operator – and in cooperation with the Institute of Road, Railway and Airfield Construction at the Technical University of Munich. The results show that the high level of acoustic performance remains intact even to this day – the materials still have the same properties and effect. "All the tests indicate that our under ballast mats will remain effective for at least another 30 years. If we take the standard track service life of 50 years for our calculations, then we can be sure that the under ballast mats will remain effective throughout and beyond this period," explains Product Manager Mirko Dold.