MBTA Green Line July 31, 2021 7:11 am Investigation Underway After Green Line Collision Officials are investigating a collision between two trollies on the MBTA Green Line B branch that left over 20 people injured on Friday. US & World Videos 4:23 Forecast: Dangerously cold wind chills 3:41 People not losing sight of what's important despite travel frustrations after snowstorm 3:33 Forecast: Deep freeze, quiet spell ahead 4:09 Snow causes holiday travel troubles in New England 2:02 Snowstorm causes delays and cancellations at Logan