Commuters on the Red Line’s Braintree branch got a speedy surprise last week. According to the MBTA, trains began traveling 50 mph on certain stretches between Braintree and JFK/UMass stations at the ...

For years, these trains could only go 40 mph. “There’s a very detailed process behind this to safety certify any speed increase across the MBTA,” Coholan said.

At least, in terms of speed. When Japan's Shinkansen "bullet train" debuted between Tokyo and Osaka in 1964, it set new benchmarks, hitting speeds of 130 mph. Fast-forward sixty years ...

According to the MBTA, trains began traveling 50 mph on certain stretches between Braintree and JFK/UMass stations at the start of service early Friday morning. T officials said it was the first ...