KiwiRail says it's in the final stages of checking work done to upgrade Wellington's rail network.
Passengers were put on buses in place of trains this weekend as most of the region's rail network shut down, with workers overhauling and computerising the lines signalling system.
The change over is a milestone in the $550 million, three-year Wellington Region Rail Programme.
The director of the Wellington Region Rail Programme, David Gordon, says he's pleased with how the work has gone, and services should be back to normal on Monday morning.
He says KiwiRail will hand the track back to TranzMetro at 4am on Monday.