Location
Stuttgart, Germany
Typology
Infrastructure
Mobility
Year
1997-2031
Status
in progress
Client
Deutsche Bahn AG
Size
185,000 m² GFA
Read more
Beneath Stuttgart’s city centre, a new kind of station is taking shape – part infrastructure, part civic landmark. As the core of the Stuttgart 21 project, one of Europe’s largest trans-port overhauls, the new eight-track underground hub replaces the existing terminus with a light-filled, future-focused through station. Twenty-eight sculptural, cantilevered concrete columns rise from the depths, their flared forms lifting a walkable green roof that will become a new city park.
The transformation runs deeper than engineering. By burying the rail lines, the project unlocks 42,000 square metres of public space, reconnects fractured districts and lays the foundation for two new inner-city precincts. The historic Bonatzbau, Stuttgart’s 1922 station hall, is preserved and folded into the new urban fabric – bridging heritage and future.
Above ground, four glass and steel shell structures punctuate the park landscape, acting as skylit entries and . The station targets zero operational energy use and pioneers Germany’s rollout of fully digital rail control. Once complete, it will move over 300,000 passengers daily – yet its real legacy lies in what it gives back: space, connection and possibility at the heart of the city.
Central Station Stuttgart is the centrepiece of the Stuttgart–Ulm rail programme and one of Europe's most ambitious infrastructure projects. Conceived as an underground through station, it not only transforms regional and international rail connectivity but also fundamentally reshapes the city itself. By relocating the railway infrastructure below ground, the project reconnects urban districts that had been separated for more than 150 years and creates entirely new neighbourhoods and public spaces above the tracks.
Selected through an international competition in 1997, the design challenged the prevailing understanding of what an underground railway station could be. While the competing proposals generally conceived the station as a technical infrastructure covered by a glazed roof that would have remained inaccessible and continued to separate the historic city centre from the emerging Europaviertel, ingenhoven associates proposed a fundamentally different approach: the station roof itself becomes a publicly accessible urban landscape. Instead of creating another barrier, the design establishes a continuous civic space that reconnects the city across the former railway corridor. This new type of public realm—where infrastructure, landscape and urban life merge—had not previously been envisioned and has become one of the defining qualities of the project.
Location
Stuttgart, Germany
Typology
Infrastructure
Mobility
Year
1997-2031
Status
in progress
Client
Deutsche Bahn AG
Size
185,000 m² GFA
Read more
At the heart of the station is its unique concrete shell structure, formed by 28 chalice-shaped columns. Their geometry is not an architectural gesture but the direct expression of structural logic. The characteristic light eyes channel daylight deep into the platform hall, improve orientation, support natural ventilation and create a spatial experience rarely associated with underground infrastructure. The result is a station that combines engineering precision with an exceptional quality of space. The project exemplifies the integrated design approach that defines ingenhoven associates. Architecture, structural engineering, daylight, climate strategy and construction were developed as one coherent system from the earliest stages of the design process. Technical innovation is therefore not an addition to the architecture but an integral part of the architectural concept itself.
At the heart of the station is its unique concrete shell structure, formed by 28 chalice-shaped columns. Their geometry is not an architectural gesture but the direct expression of structural logic. The characteristic light eyes channel daylight deep into the platform hall, improve orientation, support natural ventilation and create a spatial experience rarely associated with underground infrastructure. The result is a station that combines engineering precision with an exceptional quality of space. The project exemplifies the integrated design approach that defines ingenhoven associates. Architecture, structural engineering, daylight, climate strategy and construction were developed as one coherent system from the earliest stages of the design process. Technical innovation is therefore not an addition to the architecture but an integral part of the architectural concept itself.
More than a transport hub, Stuttgart Main Station demonstrates how major infrastructure can become a catalyst for urban transformation. It combines engineering excellence with a generous public realm, reconnects the city and establishes a new model for infrastructure as civic architecture. The project reflects our conviction that the most complex technical challenges can become the foundation for places of lasting architectural, environmental and social value.
More than a transport hub, Stuttgart Main Station demonstrates how major infrastructure can become a catalyst for urban transformation. It combines engineering excellence with a generous public realm, reconnects the city and establishes a new model for infrastructure as civic architecture. The project reflects our conviction that the most complex technical challenges can become the foundation for places of lasting architectural, environmental and social value.
A New Railway Paradigm
For more than a century, Stuttgart's railway station had reached the limits of its original concept. As a terminus station, every arriving train has to stop, reverse direction and leave the station via the same tracks. While this configuration reflected the requirements of nineteenth-century rail travel, it became an increasingly significant operational constraint within a modern European rail network.
Stuttgart 21 fundamentally rethinks this system. By replacing the historic terminus with an underground through station, the project transforms Stuttgart from the end of a railway line into a node within the European high-speed network. Capacity is increased not by expanding the number of platforms, but by enabling continuous rail operations with shorter dwell times, more efficient routing and significantly greater operational flexibility.
Yet the project was never conceived as a purely transport-engineering exercise. The relocation of the railway infrastructure below ground released more than one hundred hectares of centrally located land, making one of Europe's largest urban transformation projects possible. Infrastructure and city planning therefore became inseparable: improvements to the railway system created entirely new opportunities for urban development, while the urban concept gave meaning to the engineering intervention.
This integrated understanding distinguishes Stuttgart 21 from conventional infrastructure projects. The station is not simply a transport facility placed within the city; it is the catalyst for an entirely new urban structure. Railway engineering, architecture and urban planning were developed as one coherent vision from the outset.
For ingenhoven associates, this holistic approach remains fundamental. Major infrastructure should never be regarded as an isolated technical object. At its best, it becomes an investment in the long-term development of the city itself.
A New Railway Paradigm
For more than a century, Stuttgart's railway station had reached the limits of its original concept. As a terminus station, every arriving train has to stop, reverse direction and leave the station via the same tracks. While this configuration reflected the requirements of nineteenth-century rail travel, it became an increasingly significant operational constraint within a modern European rail network.
Stuttgart 21 fundamentally rethinks this system. By replacing the historic terminus with an underground through station, the project transforms Stuttgart from the end of a railway line into a node within the European high-speed network. Capacity is increased not by expanding the number of platforms, but by enabling continuous rail operations with shorter dwell times, more efficient routing and significantly greater operational flexibility.
Yet the project was never conceived as a purely transport-engineering exercise. The relocation of the railway infrastructure below ground released more than one hundred hectares of centrally located land, making one of Europe's largest urban transformation projects possible. Infrastructure and city planning therefore became inseparable: improvements to the railway system created entirely new opportunities for urban development, while the urban concept gave meaning to the engineering intervention.
This integrated understanding distinguishes Stuttgart 21 from conventional infrastructure projects. The station is not simply a transport facility placed within the city; it is the catalyst for an entirely new urban structure. Railway engineering, architecture and urban planning were developed as one coherent vision from the outset.
For ingenhoven associates, this holistic approach remains fundamental. Major infrastructure should never be regarded as an isolated technical object. At its best, it becomes an investment in the long-term development of the city itself.
City over Infrastructure
For more than 150 years, Stuttgart's railway corridor formed one of the city's most significant physical barriers. The extensive track fields separated the historic centre from the districts to the north, restricting urban growth and disconnecting neighbourhoods that lay only a few hundred metres apart.
The international competition for the new station sought to resolve this condition. Most proposals accepted the railway as an enduring dividing line. Large glazed roofs covered the underground station, creating impressive architectural objects while continuing to define a clear boundary between the historic city and the future Europaviertel. Although visually transparent, these structures would still have acted as barriers within the urban fabric.
The competition-winning proposal by ingenhoven associates pursued a fundamentally different strategy. Rather than designing a roof over the station, the project transformed the roof itself into a publicly accessible landscape. Infrastructure disappeared beneath a continuous urban surface that could be crossed freely from every direction. For the first time, the station no longer defined the edge of the city but became part of its everyday public realm.
This concept fundamentally changed the relationship between infrastructure and urban space. The station is experienced not as a separate building but as an extension of the city itself. Parks, pathways, squares and public routes flow uninterrupted across the former railway corridor, reconnecting districts that had remained divided for generations.
The result is more than urban repair. Stuttgart Main Station introduced a new typology in which transport infrastructure, landscape and public space become a single urban system. The project demonstrates that infrastructure can generate civic life rather than interrupt it, establishing an approach that continues to influence contemporary thinking about the relationship between mobility and the city.
City over Infrastructure
For more than 150 years, Stuttgart's railway corridor formed one of the city's most significant physical barriers. The extensive track fields separated the historic centre from the districts to the north, restricting urban growth and disconnecting neighbourhoods that lay only a few hundred metres apart.
The international competition for the new station sought to resolve this condition. Most proposals accepted the railway as an enduring dividing line. Large glazed roofs covered the underground station, creating impressive architectural objects while continuing to define a clear boundary between the historic city and the future Europaviertel. Although visually transparent, these structures would still have acted as barriers within the urban fabric.
The competition-winning proposal by ingenhoven associates pursued a fundamentally different strategy. Rather than designing a roof over the station, the project transformed the roof itself into a publicly accessible landscape. Infrastructure disappeared beneath a continuous urban surface that could be crossed freely from every direction. For the first time, the station no longer defined the edge of the city but became part of its everyday public realm.
This concept fundamentally changed the relationship between infrastructure and urban space. The station is experienced not as a separate building but as an extension of the city itself. Parks, pathways, squares and public routes flow uninterrupted across the former railway corridor, reconnecting districts that had remained divided for generations.
The result is more than urban repair. Stuttgart Main Station introduced a new typology in which transport infrastructure, landscape and public space become a single urban system. The project demonstrates that infrastructure can generate civic life rather than interrupt it, establishing an approach that continues to influence contemporary thinking about the relationship between mobility and the city.