Western Line train services in Auckland were suspended for a time this morning, after a train stopped in its tracks.
Auckland Transport said a safety override caused a train on Auckland's Western Line to stop.
Spokesman Mark Hannan said it's a feature built into trains, to immobilise them.
He said there are number of factors which could have caused it, including something on the tracks or driver error.
Hannan said the driver who was seen walking away from the train, had actually gone to get help.