A person is in a critical condition after their car crashed off a road and onto a railway line in Glenside, Wellington.
Police were called to the scene on Middleton Rd, near the Takapu Road railway station at 3.50pm this afternoon.
A police spokeswoman said the car crashed into a stream and went through a barrier onto train tracks.
She said the car's only occupant was in a critical condition, and a rescue helicopter was on its way.
Police have closed Middleton Rd between Takapu Rd and Westchester Dr.
Metlink has posted on its website that the northbound buses 210 and 211 would be diverted via SH1, missing all stops between Johnsonville to Outlet City.
The southbound bus 210 would miss all stops on Middleton Rd.
A Metlink spokeswoman said the crash would not affect train services.