The Joondalup line is a commuter rail service in Western Australia, linking the Perth central business district (CBD) with the metropolitan area's north-western suburbs. The service is operated on the Northern Suburbs Railway by Transperth Train Operations, a division of the Public Transport Authority, and is part of the Transperth network. It is 40.7 kilometres (25.3 mi) long and serves 13 stations. The service is currently, as of 2022, being extended to Yanchep as part of the Yanchep Rail Extension project, and may be renamed once the extension to Yanchep is completed.