The underground station Kartäuserhof in Cologne, seen on 13 December 2015,
the day it was taken into service. This is the intermediate level, located close
to the surface, while the platforms are located much deeper. Behind the
elevator, which passes the intermediate level without stopping, stairs and
escalators leading down to the platforms are visible, and the exits to the
surface are to be found in the background. A similar arrangement (with just one
exit to the surface) is at the other end of the intermediate level, which is
outside of the picture on the right.
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Digital photo by Christoph Schmitz
(<a href="mailto:christoph.schmitz@rwth-aachen.de">christoph.schmitz@rwth-aachen.de</a>)