Two signals of the
<a href="http://www-users.rwth-aachen.de/christoph.schmitz2/kssignal.html">Ks
system</a> seen in K&ouml;ln-Ehrenfeld on 13 September 2002. On the left is a
distant signal repeater for the signal ZR4 at track 4. The distant signal at
track 5 is still invalid.
<p>
Digital photo by
<a href="http://www-users.rwth-aachen.de/christoph.schmitz2/index.html">Christoph
Schmitz</a>