A woman has died after a single-vehicle crash just north of Huntly, Waikato.

The vehicle collided with a barrier on State Highway 1 at Ohinewai, and came to rest on a rail line about 1.10am.

The woman was taken to Waikato Hospital where she later died.

A diversion at Tainui Bridge remains in place this morning for northbound traffic.

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Rail services were expected to resume after 6am.

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