The Ashmont-Mattapan High Speed Line: Trams in Boston, USA 2020

The Local Transit Agency wants to replace these PCC trams: Here are some of their options they have floated: 1. Keep the line as is 2. Run modern light rail vehicles (similar to that on the green line) 3. Tear down the line and have buses runnings on the route instead 4. Extend the heavy rail red line (subway) to cover this route. What do you think of these options: which one makes sense the most? The Ashmont–Mattapan High-Speed Line, also called the Mattapan Trolley and M Line, is a partially grade-sepa