Light Rail Tunnel Karlsruhe

Completed 2021
Competition 2004, 1st prize
Location: Karlsruhe
Topic: Infrastructure
Investor: KASIG mbH
Gross floor area: 16.500 m²
Servicephases: 1–7, artistic direction

Like a common thread winding its way below ground, our new uniform design ties together the seven light rail stations in downtown Karlsruhe relocated underground. The design is understated, giving a certain potency and poetry to the spaces and providing a contrast to the visual and auditory overload of the busy pedestrian area overhead.

The cubature of the station interior is largely determined by the form of the respective civil engineering structures and the specific urban location.

Axonometry – seven stations

This gives each station a distinct character and high recognition value, which allude to the exterior location. By practicing restraint in the formal design of the spaces, the design underscores the symbolic character of each station structure. The concept defines two categories of space, each governed by its own design principles. In the transfer zone with stairways and mezzanine floors, the design leaves the underlying structure exposed and without cladding.

The waiting area at platform level exudes a calming, almost meditative character with its uniform color scheme and bright surfaces. 

The use of the same material on the ceilings, walls and floors reduces visual noise and places the focus on the essential elements: trains, signs and symbols.

Axonometrie Durlacher Tor
Floorplan Durlacher Tor, distribution level
Floorplan Durlacher Tor, platform level
Site plan

A key design element is the lighting concept created by Ingo Maurer. Reflecting the necessary suspension of the overhead power lines, a steel cable construction runs freely through the space. Arranged in three cables side by side and two above each other, the lighting construction appears – depending on the passengers' viewing angle – like the subtly arranged notes of a symphony. Integrated into this are LED lights, which enliven the station area with their shape and distribution and make electricity tangible. Individual lights create coloured shadows as effect lighting. Passengers and trams are isolated as actors on the bright background and atmospherically staged by the light. www.ingo-maurer.com

Realization:

Sauer, Manfred (Team Leader)
Petkov, Vasko (Project Leader)
von Arenstorff, Christian (Project Leader)
Behm, Julia (Project Leader)
Bell, Katrin (Project Leader)
Boland, Christian (Project Leader)
Karlheim, Frank (Project Leader)
Arnemann, Marion
Birke, Helge
Bösl, Tobias
Eitel, Ivonne
Giannikopoulou, Dimitra
Hansmeier, Nicole
Hartl, Eva
Heltai, Xaver
Hussein, Leila
Jahns, Henrike
Kawai, Eisuke
Kordowich, Sebastian
Liese-Schaich, Kerstin
Mesa Izquierde, Maria
Ottinger, Marc
Petzold, Mirko
Pryor, Bernine
Rafikova, Muslima
Stadler, Adrian
Fraile Vasallo, Olga
Wolfrum, Jakob
Würfel, Rouven
Landwerlin, Bertram

Specialist planners:

Obermeyer Planen + Beraten GmbH, Karlsruhe / Spiekermann GmbH, Duesseldorf (Structural design)
Obermeyer Planen und Beraten, München (Building services)
Ingo Maurer GmbH, München (Lighting planning)
Stuvatec, Köln (Fire proofing)
Wenzel + Wenzel (Projekt planning Lph 6+7)
9sekunden (Video)

Photography:

Brigida González