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Stuttgart 21: Major Progress on the New Airport Connection!

Feb 27, 2026
Stuttgart, Germany -

Stuttgart 21 - A Significant Milestone has been achieved

 

The structural shell of the new Stuttgart 21 airport tunnel is now complete – a clear indication that the project continues to take shape. All tunnel tubes, shafts, as well as the central and eastern entrances, have been finalised at shell stage. The tunnel blocks and platform areas are also complete. Meanwhile, the next construction phase, the interior work, is now in full swing!

Central entrance, circular shaft (for elevator towers), view from the future platform level 

 

Progress at Entrances and Track

Work is progressing rapidly at the central entrance, where façade installation, building services and glazing are all advancing at full speed. The lift shafts have been installed, screed is being laid inside the station, and the future platform is being surfaced with granite flooring. At the same time, technical infrastructure is being put in place.

The eastern entrance is also visibly taking shape. Here, the shell of the shaft structures below has already been completed, and the excavation pit backfilled.

Progress is equally evident in the track bed: the concrete layer for track construction has been laid, and several metres of track have been installed. At the same time, cables are being placed and infrastructure for electricity, water, and ventilation is being prepared to ensure smooth rail operations.

Circular building under construction with glass facade and wooden railings, surrounded by construction materials.
Central Entrance: Station building with initial glazing and substructure for insulation and facade

 

First test runs and next steps

A special highlight: test runs have already taken place on the above-ground section of the line towards Ulm. Initially, trains familiarised themselves with the route at 10 km/h but speeds are now reaching up to 275 km/h. Our construction section served as a turning point for the trains, and this impressive sight is a testament to the project's progress. What comes next:

  • Completion and extension of the eastern entrance building
  • Completion of platform cladding
  • Installation of ventilation systems
  • Cable laying and overhead line installation
  • Further track construction within the tunnel tubes

Stuttgart 21 is moving at ICE speed – clearly visible for all to see!

About CDM Smith

CDM Smith is a privately owned engineering and construction firm providing legendary client service and smart solutions in water, environment, transportation, energy and facilities. Passionate about our work and invested in each other, we are inspired to think and driven to solve the world's environmental and infrastructure challenges.

Construction site with scaffolding and reinforced concrete walls in a circular, multi-level structure.
Construction site with metal rebar structures ready for concrete, cloudy sky, and nearby parking building visible.

PROGRESS UPDATE

Tunnel tubes and eastern entrance

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