Train lines between Penrose and Onehunga in Auckland have been suspended because of a fault and people are being warned of delays.

"Onehunga line has been suspended, rail shuttle is in place [between] Penrose & Onehunga,'' Auckland Transport tweeted just before 4.30pm, via its social media sites.

About 4pm, Auckland Transport warned passengers of delays and cancellations to train services because of a track fault near Britomart.

"Services operating at reduced frequency,'' AT said.

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Auckland Transport said just after 5pm that recovery work was in progress, but that delays and cancellations were still to be expected as services resume.