Type 7 built by Kinki Sharyo has been the most reliable trolley since the PCC serving Boston from the mid 1980's. This bit of the E branch is in the street but may change in the future.
A Kinki Sharyo Type 7 has just passed a Type 9 in deluge. Boston as seen an unsual wet and unsettled summer this year. The 7's have been the most reliable trolley's since the PCC.