Commuter train to Johnsonville exits tunnel 7. This line was part of the Main Trunk out of Wellington until Tawa Deviation with its long tunnels was opened in 1937. The steep 1 in 40 Johnsonville Line is the surviving section and was first line electrified (1500V DC.) These English Electric D class units built in 1950's are now withdrawn.
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.