Commuters are facing delays as they head home from Auckland's Lantern Festival, with one person describing the wait for trains as "carnage".

There was a long line at Grafton railway station, near the Domain where the festival is being held, as scores of people waited to catch trains.

One person shared a photo on Twitter of a crowd of people waiting to board a train with the caption "carnage at Grafton station".

An Auckland Transport (AT) spokesman said while they had not had any complaints about delays, industrial action being taken by Rail and Maritime Transport Union meant they were unable to put on special event trains currently.

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Instead tonight's trains were running at a normal frequency for weekends.

The spokesman could not confirm whether or not AT had planned to put on special event trains for the Lantern Festival.

He said the organisation usually based the decision on the expected crowd size for an event.

The AT spokesman apologised for any train delays and advised commuters to look on the AT App to see if there were any buses they could catch instead.

The Lantern Festival closes at 10.30pm before opening for its final day at 4pm tomorrow.