Sydney Metro West is a rapid transit project under construction in Sydney, New South Wales, Australia, involving the construction of a rail line linking the Sydney City Centre (CBD) with Westmead in the outer western suburbs of Greater Sydney. The metro line will run parallel to the existing Main Suburban and Main Western railway lines, with the main aims being the doubling of rail capacity between the City Centre and Greater Western Sydney and the relief of overcrowding on the Western Line. The line will form part of the Sydney Metro network.