Sydney Metro Northwest was a rapid transit project involving the construction of a rail line through the north-western suburbs of Sydney, New South Wales, Australia. The line included the conversion of the existing Epping to Chatswood Rail Link to metro standards and connects the suburbs of Rouse Hill and Chatswood via Castle Hill and Epping. The project was managed by Transport for NSW through its Sydney Metro agency and opened to service on 26 May 2019 as the Metro North West Line.