A shunt from Port of Auckland to the classification yard at Westfield emerges from Purewa Tunnel. This line skirts the waterfront and is shared with commuter trains. The DC class were rebuilt from Da class EMD G12 locomotives introduced in 1955.
Trains on 3' 6" (1.067m) track from Whangarei to Bluff with virtually heritage rebuilt EMD and GE locomotives still the mainstay power. The network was privatized in 1990's and operated by Toll until 2008 when state owned KiwiRail was established.