The MBTA wants to bring the Red and Orange lines up to the speeds they were designed for and one official said it could happen "within days."

MBTA aims to increase train speeds on Red and Orange lines, eyeing improvements following repairs and upgrades.

With massive patches of slow zones now mostly repaired, MBTA officials have set their sights on pushing some subway speeds to even higher levels as one of the next major goals. T officials hinted Thursday that parts of the Red Line might soon be able to accommodate travel up to 50 miles per hour,