Current Status

2024-06-19  The North Auckland Line is due to reopen in July 2024  having been closed  for repairs due to  landslides that occurred during the major weather events that happened  on the 29th of January , and the 12th and 24th of February,  2023.
This most recent closure came 2 years after the North Auckland Line had reopened having been closed for a year to carry out a $110,000,000 upgrade of the tracks, sleepers, tunnels and bridges between Swanson ( West Auckland ) and Whangarei ( approximately 180 kms ) . 

North Auckland Line re-opens today : 2021 January 11.
See article from Stuff 

The North Auckland Line has been closed since June 2020 by the $110 million rail project, which involved replacing five bridges and lowering tracks in 13 tunnels.

The upgrade allows the rail line to take high-cube containers, which are commonly used in international shipping.

See also : KiwiRail Northland Rail Rejuvenation