Plan of Boylston station, showing the now-abandoned branch to the Pleasant Street Portal and the sealed passageway between the two platforms<br>Original caption: <i>PLAN OF BOYLSTON STREET STATION</i>
<bdi>Boston Transit Commission
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<a rel="nofollow" class="external text" href="https://archive.org/details/firsttwentyfourt1898bost">Annual report of the Boston Transit Commission, Volume 4</a> (1898) via Internet Archive