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Source: New Zealand Police

A woman has died following a single-vehicle crash on State Highway 1 at Ohinewai.

The vehicle collided with a barrier 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.

Rail services were expected to resume after 6am.