A shake-up is looming for KiwiRail - with the Government soon to release terms of reference for a wide-ranging review of the state-owned enterprise.
A likely focus is the current requirement to maintain a large rail network.
Transport Minister Simon Bridges said the review would cover KiwiRail's operating structure and longer-term capital requirements.
This year's Budget will invest $450 million of new capital funding in KiwiRail over two years. It comes after Bridges warned after last year's Budget that current Government handouts could not continue.
Bridges said KiwiRail had done a good job at becoming more productive, but had suffered bad luck with setbacks such as the Kaikoura earthquake.