<a href="https://en.wikipedia.org/wiki/Metropolitan_Railway" class="extiw" title="en:Metropolitan Railway">Metropolitan Railway</a> A Class 4-4-0T steam locomotive 23, built 1866.
<p>
This is the only surviving locomotive from the world's first underground railway. It is preserved at <a href="https://en.wikipedia.org/wiki/London%27s_Transport_Museum" class="extiw" title="en:London's Transport Museum">London's Transport Museum</a> in <a href="https://en.wikipedia.org/wiki/Covent_Garden" class="extiw" title="en:Covent Garden">Covent Garden</a></p>
Chris McKenna (<a href="//commons.wikimedia.org/wiki/User:Thryduulf" title="User:Thryduulf">user:Thryduulf</a>)
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>