The MBTA’s Red Line is back in business. A three-and-a-half-week closure of its Braintree Branch ended on schedule Monday with 18 miles of tracks freshly repaired. For the first time since Sept. 5, the subway system can take riders between Braintree and Boston in one smooth ride.

MBTA riders on the Red Line's Braintree branch were greeted with the fastest commutes in years Monday, after a 24-day closure to remove slow zones on the line. It's the first time in at least a decade that there were no Red Line slow zones south of JFK/UMass.

A Green Line train derailed Tuesday near an MBTA station in Cambridge, Massachusetts, injuring several people and forcing dozens of passengers to walk along the tracks to an emergency exit. The MBTA says at about 5 p.

A Green Line train derailed Tuesday near an MBTA station in Cambridge, Massachusetts, during the evening commute, and some injuries have been reported. The MBTA said shuttle buses are replacing service between North Station and Medford/Tufts due to the derailment near Lechmere.