"Stuttgart 21 is a railway and urban development project in Stuttgart, Germany. It is a part of the Stuttgart–Augsburg new and upgraded railway and the Main Line for Europe (Paris—Vienna) within the framework of the Trans-European Networks. Its core is a renewed Stuttgart Hauptbahnhof, among some 57 kilometres (35 miles) of new railways, including some 30 kilometres (19 miles) of tunnels and 25 kilometres (16 miles) of high-speed lines.
The project was officially announced in April 1994. Construction work began on 2 February 2010. In March 2013, total costs were officially estimated at 6.5 billion euros, the previous estimate being 4.5 billion euros in 2009. Heated debate ensued on a broad range of issues, including the relative costs and benefits, geological and environmental concerns, as well as performance issues." - (en.wikipedia.org 14.03.2020)
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