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A state-of-the-art Marrickville factory has finished building almost 100,000 pieces of concrete for Sydney’s new twin metro railway tunnels. At its peak, the pre-cast factory pumped out one four-tonne concrete segment every six minutes by a workforce of more than 140. Its final segment will be installed in the second metro tunnel deep under Sydney Harbour.Since April 2018, the facility has delivered 99,746 segments, which were installed by five tunnel boring machines to line 15.5-kilometre twin tunnels between Chatswood and Sydenham.