Why Did A Red Line Train Leaves Braintree Station Without An Operator?

A red line MBTA train left Braintree Station Thursday without a driver and traveled through at least four stations before stopping.

"Inspection of the train determined that some of the controls had been manipulated, and there's an ongoing investigation right now that involves folks from the MBTA, from DOT and from public safety," said Gov. Charlie Baker at a press conference. "From what we can tell at this point, it seems to be an isolated incident."

Mike Bello, editor at The Boston Globe. He tweets @TheBelloBlotter.

Carl Berkowitz, engineer specializing in transportation safety and former litigation consultant.

WBUR: MBTA Investigates After Red Line Train Departed ‘Without An Operator’