A 1912 map of surface streetcar lines connecting to the new Cambridge Subway. Even with the transfer to the new subway, travel time savings were 5-20 minutes compared to riding the surface cars into downtown Boston.
Unknown author<span style="display: none;">Unknown author</span>
<a rel="nofollow" class="external text" href="https://www.newspapers.com/clip/47393717/the-boston-globe/">Boston Globe</a>, March 20, 1912