Trentham to Upper Hutt (T2UH) was a visionary project where KiwiRail boldly attempted the first completely paperless BIM project of its scale. They showed true innovation in digital delivery and have set a benchmark for a new way of working.

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T2UH involved double-tracking of 2.7 km of the Hutt Valley line between Trentham and Upper Hutt stations, enabling trains to travel in both directions simultaneously and delivering more frequent and reliable services.

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Delivered under a collaborative early contractor involvement (ECI) model, Kiwirail were intentional in achieving a new way of working that aligns with the values of the Construction Sector Accord.

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The digital innovation in this project is a step-change in Australia and New Zealand. Through the creation of a collaborative, high-performing team, KiwiRail, along with partners, Downer and Aurecon, achieved breakthrough innovations on T2UH, which provided game-changing safety and productivity benefits for working in the rail corridor. 

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Key innovations include machine control and avoidance technology, clash and service strike avoidance, and a process for upfront as-builting.

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Digital tools developed on T2UH will contribute to a more resilient, productive rail sector, and have the potential to enhance outcomes on other infrastructure projects in New Zealand.