The MBTA Red Line is a rapid transit line in the Massachusetts Bay Transportation Authority (MBTA) system, serving the Boston metropolitan area. It runs from Alewife in the north to Braintree and Ashmont in the south, covering approximately 20 miles and featuring 26 stations. The line is known for its distinctive red color and is one of the busiest lines in the MBTA network. The Red Line is divided into two branches: the Ashmont branch and the Braintree branch. It connects key areas such as Harvard University, MIT, and downtown Boston, making it a vital transportation option for commuters and visitors. The line operates both above and below ground, providing convenient access to various neighborhoods and attractions.