Grenchenberg Tunnel

This rail link is of considerable importance since it is a passage from the Swiss plateau to the geographical Jura and Basel (Rhine town representing one of the strategic centers of the cross-border alliance "RegioTriRhena").

France having lost Alsace in 1871, international trains connecting France to Switzerland and Italy then took the Belfort-Berne axis, passing through Porrentruy, Delémont and Moutier.

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