DXs 5431 and 5039 work east across the Slovens Creek Viaduct and through tunnel 16 with export coal bound for the Port of Lyttleton, near Christchurch.
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.