MBTA 12 hours ago MBTA official talks about investigation into Green Line derailment in Cambridge US & World Videos 2:55 Forecast: Warmup for the weekend 0:41 Boston Public Schools educators fined over misuse of ‘Hamilton' tickets 0:34 Still no swimming at Crane Beach due to shark activity Forecast: Warming late week, all eyes on the tropics 3:04 Commuter chaos: NTSB investigating Green Line derailment