With the MBTA's announcement Monday, the Red Line joins the Orange and Blue lines in running free of slow zones.

For the first time in decades, the Red Line is entirely free of slow zones. According to the MBTA, it’s been at least 20 years since the busy subway line, running south from Alewife toward Braintree and back again,

Only two speed restrictions remain on the subway system and they should be rectified next month, officials said.

The MBTA's Red Line doesn't have any speed restriction zones for the first time in more than 15 years. Why it matters: Getting the T's most popular line into shape has been a long-term goal of MBTA general manager Phillip Eng and the agency's focus on repairs,

The MBTA announced last week that the last remaining slow zones along the Red Line would be eliminated by Monday, when the Harvard to Broadway section of the route comes back online following a weeklong shutdown for maintenance.