The Stockholm City Line The Art of moving a tunnel – pumping in a tight spot When the steel boxes that form the tunnel of the Stockholm City Line were transported from Estonia to Sweden, Grindex pumps were called upon to do some serious pumping. They were fitted in a barge, which was sunk and raised in order to lift the 107m by 20m by 10m boxes, several meters above sea level, so that they could be taken through the locks at Södertälje and onto Stockholm. From Estonia to Stockholm The Stockholm City Line (Citybanan) is a new six kilometre rail line linking the south of the city with the north. Part of this enormous undertaking includes a tunnel/bridge (an underwater tunnel built on pillars) crossing lake Mälaren in the centre of the city. The tunnel is made up of three steel boxes that a

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