Railway track <a href="https://en.wikipedia.org/wiki/Breather_switch" class="extiw" title="w:Breather switch">expansion joint</a> in continuous welded rail within Hayle railway station, near to the start of the Hayle viaduct, on the track to Penzance (to left of photo).
<a href="//commons.wikimedia.org/wiki/User:Rwendland" title="User:Rwendland">Rwendland</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>