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  Development of a successful whole-of-life cost solution for Sydney’s North West Rail Link

  The North West Rail is Australia’s biggest public transport infrastructure project and includes 15.5km of twin running tunnels and eight new railway stations, five of which are below ground. Solutions developed during the reference design have enabled a significant reduction in both the extent of tunnels in the project, and the depth of underground stations. These amendments to the business case design, along with the adoption of an undrained tunnel solution, have contributed to significant improvements for the project including a better customer experience and reductions in maintenance requirements. This paper outlines the approaches taken to capitalise on opportunities for an optimum project outcome in regards to the tunnel form, the tunnel alignment and the design interfaces for the delivery contracts.

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