Updated 1.42pm:

A fault at two rail crossings in Mount Maunganui was caused by a contractor accidentally cutting through an electrical cable, KiwiRail says.

There has being power outages at two road crossings at Te Maunga, a spokeswoman said. As a result of this outage the two affected road crossings will have their barrier arms raised to prevent road traffic delays.

To ensure public safety all train services have been placed on a restricted speed of 10km/hr when going through these crossings.

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It is expected it will take about 24 hours to restore power to the two crossings.

Earlier: Train barrier arms and signals have been on for at least 10 minutes at Hewletts Rd and Matapihi.

Western Bay of Plenty head of road policing Senior Sergeant Ian Campion said a Kiwi Rail contractor was on site to resolve the issue.

A member of the public stuck in traffic said cars were lined up about 200m past the Baypark roundabout.

Police officers were holding up barrier arms so traffic could flow underneath. Crossing lights were flashing.