Onehunga line services have been reinstated and are running betwen Onehunga and Newmarket.
Passengers could transfer to the Southern Line at Penrose Station, or use bus routes 30 and 309 to travel between Onehunga and Britomart, it said.
Passenger services had been affected since this morning’s gas leak, which occurred around 8am.
Only Southern and Eastern lines were initially affected, but the impact soon spread to other rail services.
By 9.30am power and outage had been mostly restored, Auckland Transport tweeted on its travel alerts page on X.
“Please anticipate delays as trains catch up and we continue to fix the malfunction in the Overhead Line Electrification for Railways ... use the AT Mobile App for live updates and alternative transport options.”
Cherie Howie is an Auckland-based reporter who joined the Herald in 2011. She has been a journalist for more than 20 years and specialises in general news and features.