The new street tunnel in Buir on the upgraded line Cologne-Düren
(<a href="http://www-users.rwth-aachen.de/christoph.schmitz2/strecke/strecke.html">ABS 4</a>)
seen from west on 23 August 2001. The new highspeed tracks above the tunnel are
under construction. When they are in service, the old tracks on the right can
be removed to continue the tunnel. Then the old tracks will be rebuilt for the
S-Bahn (urban trains). The level crossing in the background will then be
removed, too.
<p>
Digital photo by
<a href="http://www-users.rwth-aachen.de/christoph.schmitz2/index.html">Christoph
Schmitz</a>