BOSTON – An MBTA Green Line train crashed into a tunnel wall after derailing this afternoon. Seven people suffered minor injuries, and the tracks in the area were closed for 24h. The derailment happened between the Kenmore and Fenway stations, fire department officials said in a tweet. The derailed car was the first of a two-car D Line train bound for Riverside. It veered from the tracks in an area where the D Line and C Line intersect.