The map shows the original alignment of the Downtown Extension as part of the Circle Line, prior to its integration into the Downtown Line in 2007.
<a href="//commons.wikimedia.org/wiki/User:Seloloving" title="User:Seloloving">Seloloving</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>