Stuttgart - S21

PA 1.5, Lot 3, Bad Cannstatt Tunnels


DB Netz AG
DB Projekt Bau GmbH, Stuttgart, Germany


BeMo Tunnelling GmbH (BeMo)
commercial sponsor in joint venture
30% in JV “Tunnel Cannstatt S 21” (Hochtief - BeMo - Wayss&Freytag)

Project location

Stuttgart 21, PA 1.5, Lot 3, Bad Cannstatt, Stuttgart, Germany

Start of construction


End of construction

expected 2022

Project total value

290 million €


Gypsum keuper
Cover (intercity railway: 8m – 10m; interurban railway: 4m – 22m)

Technical Data

Tunnel (single- and double-track) incl. branch-off structure, connection structure with lengths > 100 m (total length approx. 630 m), 1 smoke extraction structure, emergency gallery with connecting gallery, branch-off structure and crossing structure, emergency access and two intermediate headings, underpassing existing buildings and bridges

Total length: approx. 7,950 m
Tunnel length mining technology: approx. 7,300 m
Tunnel length cut & cover: approx. 650 m
Smoke extraction structure (depth): approx. 40 m

Excavation by SEM/NATM, excavator in soft ground with shotcrete support and excavation in multiple drift sequences (side-wall drifts) with ground conditioning and pre-support where needed (pipe roofing / pipe arch canopy), partly excavation by drill & blast, cut & cover