The <a href="https://en.wikipedia.org/wiki/Safety_valve" class="extiw" title="en:Safety valve">safety valve</a> of the steam locomotive <a href="//commons.wikimedia.org/wiki/60163_Tornado" title="60163 Tornado">60163 Tornado</a>
User:Ultra7
2008-08-08
<span class="int-own-work" lang="en">Own work</span>