First you need to get to South Station in Boston. Then you can take Amtrak.
You can take the 350 or 351 or 77 bus from Burlington Mall to Alewife station and then take the red line to South Station.
Google maps will give more details. It will take an hour or more to get to SStsion from the mall using public transport. A taxi or Uber might work betterEdited: 04 October 2018, 22:59