Fire crews were also battling a freight wagon fire in Onehunga.
Stevenson said eight fire crews have been sent to a fire in a rail yard in South Auckland.
Four containers on one carriage of a train were on fire, but the fire was contained and not expected to spread. The train was not a passenger train, Stevenson said.
The alarm was raised at 10.45am.
A container smoulders after firefighters put out the blaze. Photo / Supplied
Auckland Transport said it isn't a passenger train so there are no disruptions to passenger services.