Route 73 and 71 trolleybuses and a route 74 bus in the southbound (lower) part of the Harvard Bus Tunnel in December 2020
<a rel="nofollow" class="external autonumber" href="https://www.flickr.com/photos/132192938@N04/">[1]</a>
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/132192938@N04/50776542526/in/dateposted/">IMG_3514 - Flickr</a>