french tunnel known tunnel french tunnel twin bore high speed rail tunnel western france carries line france high speed rail network mountain range beneath adjacent pass tunnel consists containing railroad track connected metres est crosses near western end tunnel tunnel excavated tunnel boring machine november february civil engineering work tunnel ended april open rest second phase est july total cost tunnel approximately million background constructed second phase est shortened completed line connect paris principal city region home european institutions including phase kilometres relatively flat land sur near paris near nancy opened second phase traverses terrain near opened line reduce travel time paris reduce travel time crosses northern point adjacent contains remnants ancient roman road line originally built owned operated infrastructure french national railway network government restructuring french railroad network merged january subdivision known construction tunnel lot segment est contracting construction lot consisted adjacent additional kilometres line saint jean september awarded million design build contract lot consortium companies led built cost approximately million excavated ton tunnel boring machine manufactured tunnel remainder consisting false tunnel constructed ends christened charlotte honor girl nearby village ceremony october began excavation bore november eastern completed bore month ahead schedule june bore rings installed concrete lining segments ring excavated cubic metres earth average speed day excavation second bore began september finished february earth excavated construct nearby sections line total concrete lining segments final passage completed june marking end construction tunnel walls april civil engineering work tunnel completed railroad signaling equipment needed installed service line originally scheduled begin april fatal accident occurred new line november commissioning tests delayed scheduled opening line july characteristics tunnel lies beneath col site located close border department department saint jean tunnel high speed rail line connect paris line main line europe trans european high speed rail line paris slovakia tunnel length consists carrying rail line flanked maintenance walkway emergency evacuation walkway connected passage tunnel built maximum speed kilometres hour mph mph commercial operation remotely monitored command center adjacent western portal traverses travels valley
Saverne Tunnel