The Influence of the Reconstruction of the Tram Tracks on the Level of Noise

The level of noise during tram operation depends on a number of factors. As generators of increased noise levels, the type of tram and the operating speed can be acted upon momentarily. The type of track base, type of rails and the rail fastening systems represent a group of factors that can be acted upon only during reconstruction, which means in longer time periods. In the endeavor to undertake adequate measures for reducing the level of noise during tram operation, in conjunction with Zagreb's Streetcar Company, the Department of Transportation of the Faculty of Civil Engineering, Zagreb University (Croatia) carried out research on the influence of track reconstruction on the noise level. As representative, the tracks chosen were the ones located on a separate strip (between carriageways), set on a continuous concrete base. The reconstruction of the tracks encompassed a complete change of rails, as well as making new rail fastening systems to the base. Short term noise level measurements, during a daily period before and after the completion of the works on the reconstruction of the tracks, were performed. The research results represent a contribution in defining the measure of influence that the usual way of reconstructing the tram tracks, carried out in the City of Zagreb, has on the reduction of the noise levels.