remaining level crossing on the line, the duplication of 8 km of track, and the rebuilding of Merinda Park Station. The project began in 2020, with duplication planned to be completed by 2023 and the level crossing removals completed by 2025, allowing a ten minutes service frequency to Cranbourne and facilitating an eventual extension to Clyde. Proposals Melbourne Metro 2 There have been various proposals for a successor to the Metro Tunnel, with the main proposal linking the Mernda and Werribee lines via a new tunnel between Clifton Hill and Newport. This proposal was first identified by PTV in the 2013 NDPMR. The new Parkville station to be built as part of the Metro Tunnel has been designed with provision for future expansion to an interchange with the second Metro Tunnel. Melbourne City Council has advocated for the tunnel, which could include stations at Fitzroy, Parkville, Flagstaff, Southern Cross and multiple stations at the urban renewal precinct Fishermans Bend. The tunnel was included in 2018 as part of the State Government's 30-year strategy for Fisherman's Bend, with two stations in the precinct, and has been backed by the independent planning agency Infrastructure Victoria in its 30-year infrastructure plan for the state released in 2021. Melbourne Metro 3 In 2018, a paper released by Melbourne City Council as part of its Transport Strategy refresh called for a third cross-city rail tunnel to be built by 2035. The council called for a stand-alone metro line running from Melbourne Airport to Maribyrnong, Arden Macaulay, Southern Cross, Parliament then east of the CBD to Richmond, Kew, Doncaster and Ringwood. Western suburbs Werribee line Extension of the Werribee line to meet the Deer Park – West Werribee line at Wyndham Vale was proposed in the 2013 NDPMR. The concept was later included in plans for the Suburban Rail Loop. Additional stations have been proposed for the Werribee line at Derrimut Road and Werribee South. Avalon Airport Prior to the 2010 Victorian state election, then-Opposition Leader Ted Baillieu promised to begin construction in his first term on an extension of the passenger rail line to Avalon Airport in Melbourne's South-West. The plan would have seen a single-line track branch off from the Melbourne-Geelong rail line. Despite the Napthine Government revealing a preferred option for the link in 2014, the proposal never progressed to construction. In 2018, Geelong Council called for a link to Avalon Airport as