Lyon–Turin Base Tunnel — BIM for Europe's Largest Alpine Tunnel
57 km of coordinated underground infrastructure modelled to construction-intent detail.
57 km
Tunnel length
€26B
Project value
LOD 350
Delivery level
3
Countries involved
Project overview
The Lyon–Turin Base Tunnel is Europe's most ambitious infrastructure project — a 57 km rail tunnel beneath the Alps connecting France and Italy. BIM was essential for coordinating the geological, structural, and MEP systems within one of the world's longest tunnels.
What made this project complex
Modelling a 57 km linear infrastructure project through complex alpine geology required precise coordination of tunnel boring, structural lining, ventilation systems, and emergency egress routes. Multiple international teams worked across different BIM standards.
How BIM coordination delivered
An ISO 19650-compliant Common Data Environment was established to manage model exchanges between French and Italian design teams. Revit and Civil 3D models were federated in Navisworks, with automated clash detection focused on MEP routing through tunnel cross-passages.
Measurable outcomes
Unified BIM delivery across 3 countries and 8 consultants
Achieved ISO 19650 compliance from design through construction
Eliminated 95% of spatial clashes before tunnel fit-out
Reduced construction RFIs by 45% in completed sections
Disciplines
Tools & Software
Delivery Level
LOD 350
Level of Development
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