Aftermath of an explosion during the construction of the Tremont Street Subway in March 1897. Gas from a leaking main damaged by subway construction was ignited by sparks from a trolley passing on the surface. Seven bystanders were killed and over forty injured.
<bdi>Boston Transit Commission
</bdi>
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/cityofbostonarchives/17618132733/">Gas explosion, corner of Boylston and Tremont Streets</a> via <a rel="nofollow" class="external text" href="https://www.flickr.com/people/48039697@N05">Boston City Archives</a>