Two driving axles of a <a href="https://en.wikipedia.org/wiki/Buchli_drive" class="extiw" title="en:Buchli drive">Buchli drive</a> and material on a rail trolley at <a href="https://en.wikipedia.org/wiki/Brugg" class="extiw" title="en:Brugg">Brugg</a> depot.
<a href="//commons.wikimedia.org/wiki/User:Abderitestatos" title="User:Abderitestatos">Abderitestatos</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>