An S 13 service to Köln Deutz, consisting of two class 423 EMU's, seen on
the bridge at the Nippes junction on 28 February 2003. With this bridge the
S-Bahn (urban trains) line crosses the tracks for the regional and
long-distance passenger trains. The third layer below is a tunnel for the
freight tracks, which is not visible here.
<p>
Digital photo by
<a href="http://www-users.rwth-aachen.de/christoph.schmitz2/index.html">Christoph
Schmitz</a>