A diverter pulley box of a wire line of <a href="https://en.wikipedia.org/wiki/Railway_semaphore_signal#Operation" class="extiw" title="en:Railway semaphore signal">mechanical railway semaphores</a> on the Braunschweig – Wieren railway line. The rusty wires (above right) are only passed through the box without touching any rollers. The snow protection hoods are missing.
<a href="//commons.wikimedia.org/wiki/User:TeWeBs" title="User:TeWeBs">TeWeBs</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>