The Kaikoura rail line is set to re-open, three weeks after it was closed when poor weather caused 31 slips.
These have been cleared and freight operations between Blenheim and Christchurch should resume on Monday night - although not full-time - says KiwiRail Group general manager network services Todd Moyle.
There will be two return freight services scheduled each night, he said.
"Despite the limited, low frequency of the services, we estimate they will help take up to 2000 trucks a month off the inland [road] route," he said.
"We will continue to work towards restoring the line to its full operating capacity over the coming months."
The line still remains vulnerable to exceptionally heavy rainfall and seismic events, Mr Moyle said.
It was shut down on October 12 just a month after re-opening following the magnitude 7.8 earthquake last November.
This time the cause was unusually heavy rainfalls in Canterbury in September and October.
The rain caused 31 slips, including three major falls, which brought rubble down onto the main north freight line and the nearby coastal road.