Utgliding av jernbanefylling ved Kolbotn stasjon.
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This station lies on the Østfold railway, 13 km from Oslo. One day in November 1936 a 4 m high newly built ballast with the rails on it suddenly sunk into a ground consisting of peat and a weak clayey deposit. Over a distance of 20-30 m from the foot of the ballast the ground rose, showing fissures and crevices of the firm upper crust. An investigation showed that the ballast sand had crept through the weak layer underneath the upper crust.