Most Auckland trains will be back to normal in the morning, after disruptions today when a fire damaged a signal box.
Auckland Transport says Southern lines will operate at a reduced frequency of every 20 minutes.
And travellers between Onehunga and Britomart will have to transfer at Penrose.
Anyone going from Britomart to Onehunga will have to travel to Otahuhu, and then transfer to Penrose.
This morning, train services on the Onehunga line were running between Onehunga and Penrose only, after a fire at Newmarket caused the signalling box to fail, Auckland Transport said.
There were no trains to Penrose, Ellerslie, Greenlane, Remuera and Newmarket this morning. On other lines, services had ran every 20 minutes.
Auckland Transport advised that the signal box continued to affect some train services this afternoon, when KiwiRail advised that repairs would be likely to take the rest of the day.