Stuttgart 21 has part(s) Tunnel Feuerbach
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, the previous estimate being €4.5 billion in 2009. In March 2022, Deutsche Bahn estimated the total cost at €9.15 billion. Heated debate ensued on a broad range of issues, including the relative costs and benefits, geological and environmental concerns, as well as performance issues.
As of 2019, the start of operation is expected in late 2025, versus an initial estimation of 2019 (made in 2010).
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