The opening of a mammoth German rail project, which has become emblematic of the infrastructure woes plaguing Europe's biggest economy, has been delayed yet again, reports said Wednesday.

"Stuttgart 21" is envisaged as a futuristic rail hub in the southwestern city, but its inauguration has been repeatedly pushed back from an original date of 2019.

Trains were due to finally start running from the new underground station in December 2026, before a full opening in the summer of 2027.

But Der Spiegel news outlet reported the recently installed head of state-owned rail operator Deutsche Bahn had indefinitely delayed it due to technical problems.

Deutsche Bahn acknowledged in a statement that "scheduling risks" had grown to "an extent that was previously unforeseeable".

It did not give fu

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