Siemens Wegberg-Wildenrath Test and Validation Centre. Here you can see the incoming rail line and siding that crosses the large test ring with a sliding bridge. The bridge is located on this side of the loop.
<a href="//commons.wikimedia.org/wiki/User:Spoorjan" title="User:Spoorjan">Spoorjan</a>
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<span class="int-own-work" lang="en">Own work</span>