Trains in and out of Auckland's Britomart station were stopped due to a person on the tracks in the tunnel.
The incident unfolded at a peak time for the station as commuters flooded the central city Britomart Station at rush hour.
Herald reporter Lynley Bilby was on a train heading into the city.
She said trains had been stopped from entering Britomart. An announcement over the loudspeaker said there was a person on the tracks in the tunnel, she said.
A police spokesman said police were called to Britomart about 4.40pm as a train driver had spotted a man walking in the tunnel away from the station.