The noise emission from overhead railways in the vertical plane shows a reduction of about 5 to 7 dba independent of vehicle speed compared to the highest emission levels for angles between 0 deg and 30 deg from the horizontal and a reduction of about 8 dba to the area below 45 deg from the horizontal shielded by the fly-over structure. Vehicle speed has the greatest influence upon noise, so that an increase of 10 km/hour in the 20 km/hour to 60 km/hour band effects an increase of 4 to 5 dba in the noise level. Above 60 km/hour the noise increase per 10 km/hour speed increase is 1 to 3 dba less than at the lower speeds. With a tram system using rails set in an aggregate bed there is about 3 dba noise increase per 10 km/hour speed increase--a lower increase than for the Rotterdam metro (4 to 5 dba)--in the 22 km/hour to 50 km/hour band. Where both sides of an overhead railway are built up, the noise level on the eleventh floor of adjoining property rises by 3 to 5 dba. An increase in the clearance to each side of the structure, from 10 m to 20 m reduces the level of noise on the eleventh floor by 1 to 2 dba. In open areas, however, the noise reduction by doubling the clearance up to 25 M is 4 dba, from 25 M to 50 M it is 5 dba and at great distances the metro acts as a point noise source with 6 dba noise reduction for each doubling of the clearance. Trams with unground wheels on unground track emit up to 3 dba higher noise levels than the same with ground wheels on ground track.

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    VDI Nachrichten

    Postfach 1139, Graf-Recke-Strasse 84
    4 Dusseldorf 1,   Germany 
  • Authors:
    • Buchta, E
  • Publication Date: 1975-11


  • German

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Filing Info

  • Accession Number: 00170020
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Report/Paper Numbers: Monograph
  • Files: ITRD, TRIS
  • Created Date: Jan 30 1981 12:00AM