The first regular daylight Wellington–Auckland passenger train services, augmenting the older overnight services, were the steam-hauled Daylight Limited and diesel-hauled Scenic Daylight, which ran primarily during summer months and Easter holiday period for many years from the 1920s onwards. The arrival of the Blue Streak and later Silver Fern railcars saw an end for a time to regular carriage trains. At the time of its cessation, The Overlander was usually hauled by DCorEF locomotives with NZR 56-foot carriages.
In 2012, passenger numbers were in decline and KiwiRail decided to replace the Overlander with the Northern Explorer, from Monday 25 June 2012. The timetable was accelerated by eliminating intermediate stops, except Paraparaumu, Palmerston North, Ohakune, National Park, Otorohanga (summer only), Hamilton and Papakura.[7] From October 2016, fire-suppressed DFB class locomotives (as required for diesel-hauled passenger trains in tunnels) were assigned to the service.
The service used one AKC and three AK class carriages, an AKL class luggage van and an AKV class power/viewing van from the Coastal Pacific. A larger AKS luggage van, converted from SA, replaced AKL in 2019.[8]
The Northern Explorer carried 39,419 passengers in the year to 30 June 2014; about 1,500 more than in 2012–13, but almost 23,000 fewer than the Overlanderin2011–12.[9] Numbers rose 71% from 2013 to 2018,[10] or about 65,000 a year and slightly more than the Overlander numbers.
The Northern Explorer served the stations shown at the foot of this page. There were variations from 2012. Papakura and Paraparaumu were added on 15 October 2012.[11] Otorohanga was added on 10 December 2012.[12] The Auckland terminus was moved from BritomarttoThe Strand Station on 21 December 2015.[13]