A train driver is believed to have made "a mistake" on the 10.25am train from Wairarapa to Wellington yesterday.
Passengers were transferred to a bus between Carterton and Wellington.
A train passenger said there seemed to be a problem when the train stopped near Carterton, north of Matarawa Station, but nothing too unusual was happening.
"They called it an operational matter, something about the driver making a mistake," she said.
It had been well handled by staff but she decided not to continue on her journey.