Pleasant Street Portal

The Pleasant Street Incline or Pleasant Street Portal was the southern access point for the Tremont Street Subway in Boston, Massachusetts, which became part of the Green Line after the incline was closed. The portal and the section of tunnel connecting it to Boylston served Green Line streetcars from 1932 to 1937, Main Line Elevated (Orange Line) trains from 1938 to 1942, and commuter rail from 1942 to 1962. The Pleasant Street Incline is now abandoned, but plans have been floated at various times to reuse it.

Reuse of part of the tunnel for the Silver Line Phase III was briefly considered, but the narrow bore was found too small for the Silver Line buses which (unlike trolleys) are not fixed to their guideway. Plans for the Phase III tunnel were shifted further west to new alignments, then canceled due to questions over the project's cost-effectiveness.

Later on, construction began in 2010 for completion in 2014 over the extension from Calendar, via Album, Woolwich and towards the Glass area.