City Rail Link


Client: Downer Soletanche Bachy JV

Location: Auckland


The City Rail Link (CRL) is the largest transport infrastructure project ever to be undertaken in New Zealand. It is a 3.45-kilometre twin-tunnel underground rail link, up to 42 metres below Auckland’s city centre, that will transform the downtown Britomart Transport Centre and provide a better connection to the Auckland rail network.

 With its technical expertise and ability to deliver a high-quality product consistently, Allied Concrete was proud to be the preferred supplier of concrete to this large project.

Over the course of the project, more than 20,000 truckloads of concrete have been delivered to site, nearly 100,000m³ of concrete has been poured and over a dozen concrete mixes have been used – including some unique mix designs. On average, more than 880m³ of concrete is delivered to site every week. Fly ash has been used to replace virgin cement lowering the carbon footprint of the concrete and saving the fly ash from otherwise going to landfill.

When fully operational, 54,000 passengers an hour will use CRL stations at peak times. This is the rail equivalent of an additional 16 lanes of road or three Auckland Harbour Bridges.

CRL construction is planned to be completed in late 2024.