Metro Tunnel
The Metro Tunnel (sometimes also known as the Melbourne Metro Rail Project or the Metro Rail Capacity Project) is a metropolitan rail infrastructure project currently under construction in Melbourne, Australia. It includes the construction of twin 9-kilometre rail tunnels between South Kensington station (north west of the Melbourne City Centre) and South Yarra (in the south east) with five new underground stations. The southern portal for the tunnel is to be located to the south of South Yarra station. As a result, the tunnel will connect the Pakenham and Cranbourne lines with the Sunbury line, and allow these lines to bypass Flinders Street station and the City Loop while still stopping in the Melbourne central business district.
Melbourne Metro 2
A report by Melbourne City Council in early 2018 stated its support for the entire MM2 project, and urged the state government to begin planning as soon as possible. It also suggested that Melbourne Metro 3 could be an entirely new line, combining a Melbourne Airport rail link and Doncaster line via a new tunnel in the central city connecting with existing stations. Then, at the end of May, a report commissioned by Infrastructure Victoria and produced by engineering consultants Arup found that MM2 would be more beneficial to the city than either of the two road projects being promoted ahead of the state election in November. The analysis suggested that MM2 would have a transformative impact on road congestion and consequently on the efficient transport of freight, but would be unlikely to ever produce a positive cost-benefit ratio using traditional methodology. The report attributed this in part to the enormous capital cost of the project, which it estimated at $20.3 billion.