High Quality Content by WIKIPEDIA articles! KiwiRail Holdings Limited is the rail operations subsidiary of the New Zealand Railways Corporation, which trades as KiwiRail. Headquartered in Wellington, New Zealand, KiwiRail is the largest rail transport operator in New Zealand. Since July 2010 John Spencer has been the Chairman. Tranz Scenic, Tranz Metro, Interisland Line and Hillside Engineering are all subsidiaries of KiwiRail.