Service was suspended on a portion of the MBTA's Green Line Monday morning due to a "power problem," the agency said.
In a tweet, the MBTA said service was suspended between North Station and Kenmore due to the issue at Arlington station.
Commuters were told they could use the Orange Line to Back Bay station and take shuttle buses from there. Those who normally take the B Branch were told they board shuttles at Blanford Street.
Get Boston local news, weather forecasts, lifestyle and entertainment stories to your inbox. Sign up for NBC Boston’s newsletters.