Pass-by noise of railbound vehicles is measured according to TSI-CR-NOI;2005 or EN ISO 3095:2005. Noise generation is characterised by the microphone 7.5 m distant from the track and 1.2 m height above rail with a second optional position at 3.5 m height. TSI-CR-Noise has position requirements outside the primary track while according to EN ISO 3095:2005 it is also allowed to measure across the second track (Fig. 1).