You can actually get a train from Boston (North Station) to Acton. The South Acton stop is just after the West Concord stop.
Handy if you don't have a car or don't want to bring one into Boston.
However, you will need someone to pick you up at the train 'station/stop'. There are no buses or any other forms of transport except walking and cars otherwise. Maybe a taxi is an option, but I have never seen one waitig at the train station (er.. train stop)









