Auckland rail workers will go on strike to protest a decision to introduce driver-only operations on the city's passenger trains.
The strike takes place from 2am Friday, for 24 hours.
The workers' employer, French-owned company Transdev, is determined to reduce crew numbers and introduce driver-only trains, says Rail and Maritime Transport Union advocate John Kerr.
"This plan puts passengers and drivers at risk, and the only reason we can see for it is cutting costs and increasing profit," he said.
Transdev's proposal would make train drivers have responsibility for monitoring door operation and passengers, dividing their attention and significantly increasing the risk of accident, Mr Kerr said.
"Our members don't want to inconvenience the public, especially this close to Christmas, but they will not compromise on the safety of passengers or the rail network," he said.
Wellington rail workers went on strike for 24 hours on November 16, protesting Transdev's desire to cut working conditions and penalty rates for working weekends.