“Stuttgart 21” (named for the 21st century) was meant to be completed by the end of 2019 at a cost of €4.5bn. It is now forecast to be finished by 2025, and the cost may rise to nearly €12bn.

The Stuttgart-Ulm railway project, also known as Stuttgart 21 or S21, is an infrastructure project being undertaken by the railway company Deutsche Bahn to improve the railway connection between ...

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