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The Newmarket Line is a railway line in Auckland, New Zealand, that runs between Quay Park Junction, near Britomart Transport Centre, and Newmarket Train Station. It is 2.64 km long. It connects the North Island Main Trunk (NIMT), which runs into Britomart via the waterfront, and the North Auckland Line (NAL), which runs between Westfield and Otiria via Newmarket and Whangarei. It serves as parts of the Southern Line, Western Line and Onehunga Line of the Auckland commuter network. It has been named the Newmarket Line since 2011. It was named the Auckland–Newmarket Line from 1996 to 2011, as it ran from the Auckland Railway Station until the station closed in 2003. It was named the Newmarket Branch Railway from 1977 to 1996.
Since 1915 it has been fully double tracked after an upgrade of Parnell Tunnel north of Newmarket. Previous to that, it led as a single track section through a previous Parnell Tunnel.
In 2007 the major junction that connects the Newmarket Line with the North Auckland Line was rebuilt into a 'wye junction', removing the time consuming reversing backshunt needed to access the NAL to the north from the Newmarket Line, thus giving the line better access to Britomart Station. This is part of a big upgrade of rail infrastructure in Auckland and the Newmarket Station and Junction is included in the stage one electrification of the network.
Construction of a new station, Parnell, on the line at Parnell, is nearing completion then finally opened since 12 March 2017 serving the Western and Southern Lines of the city's train network. The opening and operation of the station is expected to take place before June of that year.