New Zealand Railways Department (also known as New Zealand Government Railways) - New Zealand national rail owner/operator to 1982
New Zealand Railways Corporation - New Zealand national rail owner/operator from 1982–1990, railway land owner 1990 - 2003, rail network owner trading as ONTRACK 2003 - 2008, railway land owner 2008–present
New Zealand Rail Limited - national rail owner/operator 1990 to 1995 (privatised 1993)
Tranz Rail - national rail owner/operator 1995 to 2003
Toll Rail, a division of Toll NZ - rail services operator 2003 - 2008
KiwiRail - national rail owner/operator 2008–present