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.
High-speed rail in Australia
In 2014, the low-carbon advocacy group Beyond Zero Emissions released a detailed study in response to the Rudd government's Phase 2 report. Prepared in collaboration with the German Aerospace Centre, the study used many of the same cost assumptions but proposed a modified route to minimise construction expense. Although slightly longer (1799 km compared to 1748 km), the length in tunnel was reduced by 44%, and the length on bridges by 25%. Much of the reduction came through making greater use of existing transport corridors for metropolitan access; the government study took the politically uncomplicated but extremely expensive option of simply tunnelling to the terminal stations. Project author Gerard Drew also criticised the Phase 2 Report's 45-year construction timeline, calling it "laughable". Drew also suggested that there was significant "gold plating" evident in the government report's cost estimates. BZE forecast that the high-speed railway would cost $84.3 billion and take 10 years to construct.