Auckland commuters are likely to face delays again today, even though Britomart Station has now re-opened after yesterday's train derailment near a platform.

Auckland Council confirmed this morning that "limited train services" were now running at Britomart every 20 minutes.

Meanwhile motorists also face potential delays with heavy fog blanketing parts of Auckland this morning.

The fog could cause problems at Auckland Airport this morning, with one Air NZ flight from Bali forced to divert to Melbourne. So far no domestic flights have been affected.

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Yesterday's Britomart derailment crippled the busy station after three of six carriages derailed as a train arrived at the station at 9.45am yesterday. Some passengers described the accident as a sudden shake "like an earthquake".

The six-carriage train had 33 people on board but no one was injured.

Yesterday afternoon commuters told the Herald the closure had added as much as an hour to their trip home.

Louise Caro was aware of the closure of the station before arriving but was annoyed at the confusing planner provided by Auckland Transport detailing what bus she needed to catch.

She was on her way home from work to Morningside and expected the interim transport options would mean her commute was at least an hour longer.

"I would normally be home by 5.10pm but God knows how long it will take me now. I may have to get my husband to come get me.

"It should be fixed by tomorrow, it is just one train for God's sake. I'm frustrated."

She was lucky she lived in central Auckland and feared for the length of commute for people in the fringes of the city.

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About 12 Auckland Transport staffers were at the two entrances directing people to the Newmarket and The Strand stations via buses.

Andrew Blomfield was travelling home to Papakura and said the closure was " bit of a pain in the arse".

Praveen Sivapalan said he didn't know much longer it would take for him to get home to Howick but expected it would add another half an hour at best.

At worst it could be more than an hour, he said.

Auckland Transport staff were at Britomart Train Station redirecting commuters to buses and other stations after the derailment. Photo / Doug Sherring
Auckland Transport staff were at Britomart Train Station redirecting commuters to buses and other stations after the derailment. Photo / Doug Sherring

An Auckland Transport spokesman said there would be delays and changes to where the trains departed and arrived last night and through to the morning.

The station was to be closed overnight as the Transport Accident Investigation Commission looked into the incident.

The commission arrived at the scene about 3pm and was now in control of the station, Auckland Transport media relations manager Mark Hannan said.

Transport Accident Investigation Commission senior communications adviser Simon Pleasants said investigators would be mapping, recording and gathering evidence from the site to make sure the re-railing crew had all the information they needed to get the train back on track.

He could not say if the train had been put back on the rail or when the station was likely to open.

"The commission opens an inquiry when it believes the circumstances of an accident or incident have - or are likely to have - significant implications for transport safety, or when the inquiry may allow the commission to make findings or recommendations to improve transport safety."

Pleasants said at 7pm commission investigators had completed their evidence gathering and had handed back control of the site to KiwiRail and Auckland Transport.

Eastern Line services will arrive at and depart from The Strand on a 20-minute frequency, Western and Southern Line services will arrive at and depart from Newmarket on a 20-minute frequency.

Onehunga Line services will run as a shuttle between Onehunga and Penrose, linking to Southern Line services.

Auckland Transport advised after 9pm the Eastern line services would only operate between Manukau and Panmure.

"No train services will operate from Panmure to the Strand after this time.

"There are no services to or from Parnell Station until further notice."