Looking east on Cambridge Street at the former location of the Joy Street Portal. The grate covers a ventilation shaft for the two Blue Line tail tracks that extend from the Bowdoin loop, and an escape hatch is visible behind the traffic light.
<a href="//commons.wikimedia.org/wiki/User:Pi.1415926535" title="User:Pi.1415926535">Pi.1415926535</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>