The cab signals in an <a href="https://en.wikipedia.org/wiki/Chicago_%27L%27" class="extiw" title="w:Chicago 'L'">El</a> train, <a href="https://en.wikipedia.org/wiki/Chicago" class="extiw" title="w:Chicago">Chicago</a>, Illinois
Sean Lamb (<a href="//commons.wikimedia.org/wiki/User:Slambo" title="User:Slambo">User:Slambo</a>)
CC BY-SA 2.5
<span class="int-own-work" lang="en">Own work</span>