Report on derailments at Gulleråsen metro station on the Holmenkollen line on 2 and 3 September 2016

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On Friday 2 September, one bogie of a metro train derailed after stopping at Gulleråsen station. On Saturday 3 September, the same thing happened in the same place.

Following an inspection of infrastructure and the metro train after the derailment on 2 September, the section of the line was reopened for traffic without dry rails having been discovered.

After the derailment on 3 September, it was observed that the rails were dry and that there were shavings in the ballast as a result of wear and tear.

Investigations carried out by the Accident Investigation Board Norway (AIBN) showed that a central system for filling wheel flange lubricant at the workshop at Ryen was out of order and that equipment for stirring lubricant at Avløs workshop was disconnected. This led to more trains than planned operating with their wheel flange lubrication system out of order. Over time, this will result in the lubrication layer on the rails being worn down.

The AIBN does not make any safety recommendations in its report because of actions already decided or implemented by Sporveien T-banen AS after the derailments.

Gulleråsen, Holmenkollen line
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