name: Northern Ireland Transport Holding Company
notes: The Northern Ireland Transport Holding Company is responsible for the operation of its subsidiary companies, including Ulsterbus, Metro (previously Citybus) and Northern Ireland Railways, trading jointly as Translink.
  
  
  The Northern Ireland Transport Holding Company (NITHC) is a public corporation and its responsibilities include holding and managing property assets and the oversight, in terms of support, control and supervision, of its private limited subsidiary companies, the principal ones being Ulsterbus, Metro (previously Citybus) and Northern Ireland Railways, trading jointly as Translink.
  
  
  Notes source: NI Department for Infrastructure website This authority is based in Northern Ireland, or primarily serves Northern Ireland.