423 199-9 is the leading unit of S 8594 (Troisdorf-Köln Hansaring)
arriving at Köln/Bonn Airport on 13 June 2004. It was the first day of
regular service at the new airport station. The S 13 line used to run to
Düren in the past (what is now done by the S 12), now it serves the
airport. On the first day rides were free, and a huge number of people came.
<p>
Digital photo by
<a href="http://www-users.rwth-aachen.de/christoph.schmitz2/index.html">Christoph
Schmitz</a>
(<a href="mailto:christoph.schmitz2@post.rwth-aachen.de">christoph.schmitz2@post.rwth-aachen.de</a>)