The DF class were built by GM in Canada and introduced from 1979. In 1990's were upgraded with turbo etc to GT22 MC. Assisting are DC 4058 and 4594. 126 is now the only daytime train along the 220Km long North Auckland Line to Whangarei.
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.