planning restarted several years later; the phase 2 alternatives analysis report (which indicated electric or diesel service through stoughton as the best choice) was released in september 2009. the army corps of engineers released a draft environmental impact statement in march 2011. concurring with previous documents it recommended that south coast rail be routed through stoughton, citing in particular the need to add a billion-dollar fourth track from back bay to forest hills to accommodate service through attleboro. however, the deis differed from the previous reports by strongly recommending that service be electric.