A train has derailed at National Park in the central North Island.

Police said six carriages came off the tracks at about 4.30pm and were currently blocking Carol Street.

No gas or dangerous goods were on board, and no one has been injured.

Emergency services were in attendance.

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Former radio shock jock Iain Stables witnessed the train coming off the tracks.

"There was so much dirt and dust coming from behind it, and then it was almost like in slow-motion, like seeing a building being demolished.

"The first wagon came off the track and then the other ones flipped over it like dominos.

"The driver got out and was walking around and he seemed OK, it doesn't look like anyone has been injured."

Mr Stables said the main track was completely blocked.

"If you've ever stood there and seen a train roll over, it is unreal."

Kiwirail spokeswoman Julie Buchanan said five wagons derailed about 4pm.

"As a result of the incident, part of the train is blocking the Fisher Rd level crossing, and freight services on that section of the North Island Main Trunk line are going to be disrupted. KiwiRail is working to clear the site, and while it is too early to say what caused the derailment, we will be investigating."