Dead trolley at Chestnut Hill this morning.
7:35 update: One could ask the same thing about commuter rail: As I type, there are 17 alerts about delays at the MBTA Web site.
9:00 update: Probably should have written "What is it about the T?" since switch problems at Oak Grove AND a dead train are causing agita on the Orange Line. Or as Boon Sheridan tweets: "Orange line from inbound from Oak Grove dead in the water. Seek alternate routes and aspirin."