City Rail Link

City Rail Link is the largest transport infrastructure project ever undertaken in New Zealand with the 3.43km twin tunnel underground rail link set to transform Auckland.

Downer is curretly one of seven companies that form Link Alliance, delivering the main stations, tunnels and systems for Auckland’s game-changing City Rail Link (CRL). 

Downer has also been a partner in the two joint ventures which delivered Contract’s One and Two for the project. 

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Downer continues to partner with KiwiRail nationally, supporting Kiwi Rail to deliver projects that contribute to strengthening connections across New Zealand.

We self-perform a wide range of activities in a live rail environment, such as civil and track works, construction of maintenance facilities and supporting structures, signals and communications.

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Digital Engineering

Digital Engineering is a core part of our offering. We have a strong team of thought leaders in this space, working closely with our business partners to develop innovative solutions to complex engineering challenges.

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Using BIM to optimise construction of CRL projects

Downer’s Digital Engineering team has worked closely with CRL, designers, construction teams and MEP sub-contractors to produce a LOC 400 Construction BIM model to optimise construction planning and execution. Features include coordinated 3D models of supports and restraints, real-time as-built data capture via laser scanning, update of models, drawings and schedules and site set-out of hangers.

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Mobile mapping of rail assets – a safer, more efficient method of data capture

Through our Road Science business, we have access to a Leica Pegasus II Ultimate mobile mapper, which is the only one of its type in New Zealand. Combining highly detailed and very accurate point cloud and photogrammetric datasets. It can be mounted to a range of vehicles, including specialist 4WD, high rail or flat deck carriages travelling up to 100 km/h.

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Digital Transformation on Trentham to Upper Hutt

Digital shields protected workers and kept trains running on Kiwi Rail lines near Wellington, during the delivery of the Trentham to Upper Hutt Double Tracking project – the first of its kind to harness an invisible, digital shield in the railway corridor. 



The shields protect overhead power lines and other sensitive areas by locking the controls of excavators if any part of the machine makes contact with it. Results include increased safety for excavator operators, as well as for the thousands of passengers who ride trains along the line on their daily commute. This technology was the result of collaboration between Downer, Aurecon, and Kiwi Rail.

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