The underground station Kartäuserhof in Cologne, seen from the southern
end of the eastern platform on 13 December 2015, the day it was taken into
service. The platforms are located in the single-tracked tubes which were
drilled by tunnel boring machines, only the central structure with the
intermediate level, the staircases and the connecting tunnels was built by the
cut-and-cover method. The Severinstraße, which the line follows in this
area, is very narrow, the bigger part of the tubes is already located underneath
the adjacent houses. The lower end of the southern staircase, with escalators
and stairs leading up to the intermediate level, is visible on the left.
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Digital photo by Christoph Schmitz
(<a href="mailto:christoph.schmitz@rwth-aachen.de">christoph.schmitz@rwth-aachen.de</a>)