At the crossing of Aachener Straße and Gürtel in Cologne, there are
these rectangular crossings of the tram catenary. The diamond shaped frames
keep the contact wires at the same level. Picture taken on 15 June 2002.
<p>
Digital photo by
<a href="http://www-users.rwth-aachen.de/christoph.schmitz2/index.html">Christoph
Schmitz</a>