Arms of the <a href="https://en.wikipedia.org/wiki/City_and_South_London_Railway" class="extiw" title="w:City and South London Railway">City and South London Railway</a> on the reserve side of the pedestal of the monument to <a href="https://en.wikipedia.org/wiki/James_Henry_Greathead" class="extiw" title="w:James Henry Greathead">James Henry Greathead</a> in the <a href="https://en.wikipedia.org/wiki/City_of_London" class="extiw" title="w:City of London">City of London</a>. The arms incorporate, the arms of the City of London (bottom left) and the <a href="https://en.wikipedia.org/wiki/Southwark" class="extiw" title="en:Southwark">en:Southwark</a> Cross (bottom right) representing the two parts of the city connected by the railway. The wavy bars represent the <a href="https://en.wikipedia.org/wiki/River_Thames" class="extiw" title="en:River Thames">River Thames</a> under which the railway tunnelled and the bridge represents <a href="https://en.wikipedia.org/wiki/London_Bridge" class="extiw" title="en:London Bridge">London Bridge</a>, close to which the tunnels ran.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/10260831@N02">Denis Barber</a>
CC BY 2.0
<a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a>: <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/10260831@N02/2788652641">Plauqe on Monument::James Henry Greathead</a>