Auckland Transport is closing a station and a railway crossing for four years to make way for work on the City Rail Link.
The crossing on Porters Avenue will be closed to vehicles on 29 May and the adjoining Mt Eden station on 11 July.
The closures, which were delayed by the Covid-19 lockdown, will last until 2024, when the City Rail Link is due to be completed.
Other train services will not be affected.
"Building a temporary station was also investigated but there was not enough room inside our construction zone," said Dale Burtenshaw, a deputy project director for Link Alliance, which is building the stations and tunnels for the City Rail Link.
To fill the gap, Auckland Transport will run a new free bus service between Kingsland and Newmarket from 5 July, running every 15 minutes from 7am to 7pm.
The Mt Eden station redevelopment will include two new tracks, and a trench to connect them with the rail link tunnels.
At Porters Avenue, the level crossing will still be accessible for people on foot, or with a bike, mobility aid, scooter or pram until a footbridge is built.