A dual mode excavator parked in Sindorf (on Cologne-Aachen) on 16 December
2001. Note that the outer tires have an off-road profile, while the inner ones
(also used for the traction on rails) have not.
<p>
Digital photo by
<a href="http://www-users.rwth-aachen.de/christoph.schmitz2/index.html">Christoph
Schmitz</a>