Tranz Metro, a business unit of KiwiRail, is the operator of Metlink suburban trains owned by the Greater Wellington Regional Council in the Wellington Region of New Zealand.Tranz Metro operates the five-line 154-kilometre (96 mi) Metlink network, fanning north out of Wellington, the capital of New Zealand, as far as Waikanae in the north and Masterton in the east. On average, 930,000 trips are made on Metlink trains each month.