The Chicago Transit Authority's Brown &amp; Purple Lines move tens of thousands of commuters in the afternoon rush through the Near North Side. You can see six trains (although the camera only follows five of them).
The video is sped up 3x.
<a rel="nofollow" class="external text" href="https://vimeo.com/stevevance">Steven Vance</a>
CC BY 3.0
<a href="//commons.wikimedia.org/wiki/Category:Vimeo" title="Category:Vimeo">Vimeo</a>: <a rel="nofollow" class="external text" href="https://vimeo.com/277375128">Rush hour rapid transit in Chicago</a> (<a rel="nofollow" class="external text" href="//web.archive.org/web/*/https://vimeo.com/277375128"><span style="color:#9602fc">view archived source</span></a>)