MBTA officials said this week they’ll continue to seek a solution to the screeching wheels on the Mattapan Line trolley as the transportation agency’s chief promised residents a “station master” they can complain to about matters at the still-under-construction Ashmont Station. After a Tuesday night meeting at All Saints Church, elected officials and abutters to the station, after years of frustration over the squealing of the wheels as the 70-year-old trolleys round the turn atop a viaduct, said they were optimistic that a solution could be found.  Read more