A train has broken down near Manurewa causing fresh problems for commuters heading into the city this morning.

It's the latest headache for those using rail public transport after a string of delays in the past fortnight.

Auckland Transport has tweeted an advisory to expect disruptions as a result of today's breakdown.

It warned commuters there would be delays and cancellations to the southern line.

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The freight train was blocking the line near Manurewa.

It's the fourth time this week the train schedules have been impacted. Yesterday a signal fault near Middlemore Station affected trains on the southern line at morning rush hour. Trains were also delayed or cancelled in the morning after a trespasser was spotted on train tracks.

On Tuesday a fault on a train caused issues for those travelling between Pukekohe and Papakura.

And on Monday a tree brought down in bad weather over tracks near Britomart meant services to the west and south were affected.