Connection between two "Married Pair" coaches of operator Nord-Ostsee-Bahn (NOB).
<a href="//commons.wikimedia.org/wiki/User:DABpza786.0" title="User:DABpza786.0">Christian Dittmer</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>