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In connection with the detailed planning of new double track railway tunnel approx. 23.5 km long from Oslo to Ski, the Geological Survey of Norway (NGU) on request from the Norwegian Rail Road Authority (Jernbaneverket Utbyggingsdivisjonen) conducted an upgrade of the geological and geophysical background material at a regional scale and delivered it in a digital form in 2007 (Lutro et al. 2007).