This data was sourced from KiwiRail as at April 2017.
Ministry of Transport
New Zealand Transport Outlook 2016
http://www.transport.govt.nz/research/new-zealand-transport-outlook/
At URL provided, select 'Download the data to Transport Outlook 2016 [XLSX, 397 KB]'
File as imported: New Zealand Transport Outlook 2016
From the dataset New Zealand Transport Outlook 2016, this data was extracted:
B5:B19
This data forms the table Transport - Regional breakdown of rail network route length Apr 2017.
July 10, 2017
The Transport Outlook: Current State report looks at the current transport system and for the first time summarises the New Zealand transport system in one place.