A gas leak from an LPG storage tank at Picton's rail yard disrupted Cook Strait ferries and trains earlier today.
Fire crews from Picton and Nelson isolated the leak in a 24,000 litre tank and a 200 metre cordon was been established.
The issue had now been fixed, cordons had been removed and shipping was back to normal.
Fire and Emergency's Ian Littlejohn said port operations were suspended and ferries were asked not to dock at the wharf.
He said crews had worked to isolate the leak and had stopped it.