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Wayss & Freytag
  Content Type Features
  Date 1999
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Zimmerberg Tunnel: Zurich- Thalwil section
15 October, 1999
Claus Becker, Wayss & Freytag, Tunnel Construction and Civil Engineering, gives a progress report on the first part of the Zimmerberg rail tunnel, which is being excavated by a convertible TBM to cope with difficult ground conditions.