The Cook Strait ferry connection — the "marine highway" that carries State Highway 1 and the rail network between the North and South Islands — has become one of New Zealand's most politically fraught infrastructure problems. After the previous Labour government's plan to buy two large rail-enabled ferries was cancelled in late 2023 over a runaway cost estimate, the country faces an ageing fleet, a multi-hundred-million-dollar cancellation bill, and a replacement programme that will not deliver new ships until 2029.

What's happening:

• The Inter-Island Resilient Connection (iReX) project, begun under Labour, was originally budgeted at about $775 million in 2018 but the estimated whole-of-project cost had escalated to roughly $3 billion by 2023, with KiwiRail requesting a further $1.47 billion mostly for harbourside infrastructure in Wellington and Picton (RNZ, Dec 2023).
• On 13 December 2023 Finance Minister Nicola Willis declined the extra funding, saying only about 21% of project costs related to the core job of replacing the ferries, and the project was wound down (1News; Beehive release).
• Cancelling the South Korean-built ships was not free: a settlement with Hyundai Mipo Dockyard of $144 million brought total HMD payments to about $222 million, and the all-in cancellation and wind-down cost reached roughly $671 million (1News, Aug 2025).
• The existing three Interislander ferries were all built in the 1990s and have suffered repeated failures: the Kaitaki lost power and declared a mayday with more than 800 people aboard off Wellington on 28 January 2023 (KiwiRail later fined $412,500), and the Aratere ran aground near Picton on 21 June 2024, leading to a $375,000 fine after investigators found crew were effectively untrained on a new steering system (Maritime NZ; 1News, May 2026).
• After a Ministerial Advisory Group reported, Rail Minister Winston Peters announced in March 2025 two new rail-enabled ferries (~200m long, 1,500 passengers, 40 rail wagons each) to enter service by 2029, with a total project budget capped at under $2 billion (1News, Mar 2025; RNZ, May 2025).
• In October 2025 the government, through delivery vehicle Ferry Holdings, named China's Guangzhou Shipyard International as the builder, with the ship contract reported at a fixed $596 million (NZ Herald, Oct 2025).

Where the parties stand:

• Finance Minister Nicola Willis (National) framed the cancellation as ending "yet another sorry chapter" of what she called the previous government's mismanagement, arguing the iReX option was the "equivalent of the Ferrari" when the country needed fiscal restraint — a stance consistent with the coalition's broader spending-cut programme.
• Rail Minister Winston Peters (NZ First) took control of the replacement, rejecting his own advisory group's advice to buy cheaper road-only ferries and one-shipyard procurement, instead pursuing rail-enabled ships via competitive tender; he says the plan is "markedly cheaper" than the cancelled programme and will save "billions".
• Labour (transport spokesperson Tangi Utikere) argues the coalition has set the country back years, saying New Zealanders will "wait another three years" for ferries and still lack certainty on cost; Labour built iReX as part of decarbonising freight.
• The Ministerial Advisory Group (chaired by businessman Murray Strong) recommended road-only ferries as cheaper overall — advice the government publicly declined, choosing rail capability to protect the integrated rail-freight network.

What to watch:

• Whether the new project holds to its under-$2b cap and the 2029 in-service date, given iReX's history of escalation, and how port enabling works at Picton and Wellington are funded.
• The reliability and safety of the 1990s-built fleet over the four-year gap, after the Kaitaki and Aratere incidents and ongoing maintenance pressures.
• Debate over choosing a Chinese state-linked shipyard and the trade-off between rail-enabled versus road-only ships for long-run freight costs.
• Whether resilience (a single point of failure for SH1 and the rail network across Cook Strait) drives any move toward a third operator or backup capacity, alongside private rival Bluebridge.

_Balance note: this entry summarises positions held by named ministers and opposition spokespeople; figures are sourced and cost estimates have shifted over time as the projects evolved._