MBTA 16 hours ago MBTA official talks about investigation into Green Line derailment in Cambridge US & World Videos 3:47 Forecast: Temps in the 70s later this week 2:55 Forecast: Warmup for the weekend 3:47 NTSB investigating Green Line derailment: What to know 0:41 Boston Public Schools educators fined over misuse of ‘Hamilton' tickets 0:34 Still no swimming at Crane Beach due to shark activity