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2019/04 eng

Report on runaway work machine at Ensjø Metro station 7 June 2018

At 16:20 on Thursday 7 June 2018, a mobile elevating work platform (MEWP) collided and derailed on tunnel track 1 between Ensjø and Carl Berners plass.

The MEWP operator had not received adequate instruction in how the brake system worked, and operated the machine in a way that caused the parking brakes to be deactivated during on-tracking. Examination of the MEWP showed that it lacked technical barriers against incorrect operation, which meant that it was possible to deactivate the parking brakes. In the course of the investigation, the MEWP supplier has introduced technical barriers against incorrect operation, and it is claimed that this will prevent future recurrence of similar incidents.

The AIBN has found weaknesses in Oslo Metro AS's control mechanisms relating to supplier management, with inadequate control of operators' level of competence and the condition of hired vehicles.

The AIBN submits one safety recommendation for more extensive verification by infrastructure owners that hired personnel have the correct training and qualifications.

Safety recommendation

Safety recommendation JB No 2019/02T

On Thursday 7 June 2018, a mobile elevating work platform (MEWP) collided and derailed on tunnel track 1 between Ensjø and Carl Berners plass metro stations. During on-tracking at a gradient of 40‰, it started to run away. The operator had not received adequate instruction in how the brake system worked, and operated the MEWP in a way that caused the parking brakes to be deactivated.

The Accident Investigation Board Norway recommends that the Norwegian Railway Authority request of Infrastructure Managers that they strengthen their supplier management with a view to detecting any lack of safety-critical competence in hired operators of this type of vehicle.

Facts

Location Ensjø Metro station
Occurrence date 07.06.2018
Type of Transportation Working engine
Type of occurrence Runaway train
Rolling Stock Arbeidsmaskin

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