A double-slip switch under construction seen in Sindorf on the upgraded line
Cologne-Düren
(<a href="http://www-users.rwth-aachen.de/christoph.schmitz2/strecke/strecke.html">ABS 4</a>) on 10 October 2001. The western half is already visible, at the
left end is the center with the flangeways for the crossing tracks. The western
frog is on the right in front of the catenary mast. Apart from this parts and
the sleepers, only the outer rails for the diverging routes are by now
assembled. The excavator is about to lift one of the tongues into position.
<p>
Digital photo by
<a href="http://www-users.rwth-aachen.de/christoph.schmitz2/index.html">Christoph
Schmitz</a>