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Commonwealth Avenue Line |image = MBTA Green Line B.jpg |image_width = 330px |caption = AnsaldoBreda Type 8 #3840 waits at a red light on Commonwealth Avenue at Carlton Street. |type = Light rail |system = Green Line |status = |locale = Greater Boston |start = Park Street |end = Boston College |stations = 25 |routes = |ridership = 26,310 (weekday average boardings from surface stops in 2010-2011)〔 |open = October 23, 1932 |close = |owner = MBTA |operator = MBTA |character = Underground (Kenmore and eastward) Center median running (west of Kenmore) |stock = Kinki Sharyo Type 7 Ansaldobreda Type 8 |linelength = |tracklength = |notrack = |gauge = |el = |speed = |elevation = |map = |}} The "B" Branch, also called the Commonwealth Avenue Branch or Boston College Branch, is a branch of the MBTA Green Line light rail system which operates on Commonwealth Avenue west of downtown Boston, Massachusetts. One of four branches of the Green Line, the "B" Branch runs from Boston College station down the median of Commonwealth Avenue to Blandford Street. There, it enters Blandford Street Portal into Kenmore station, where it merges with the "C" and "D" branches. The combined services run into the Boylston Street Subway and Tremont Street Subway to downtown Boston. "B" Branch service currently terminates at Park Street; normally it runs to Government Center station which is undergoing renovations until 2016. The Green Line Rivalry between Boston College and Boston University is named in reference to the "B" Branch, which runs to both universities. ==History== In 1896, tracks were laid on Commonwealth Avenue from Chestnut Hill Avenue west to the Newton town line at Lake Street, and around the same time the Commonwealth Avenue Street Railway opened, extending the tracks through Newton to Norumbega Park; this later became part of the Middlesex and Boston Street Railway. Trains between Lake Street and downtown Boston used tracks on Beacon Street, now part of the "C" Branch. From Kenmore Square they continued east on Beacon Street, then turned south on Massachusetts Avenue and east on Boylston Street to Park Square. In 1900 tracks were installed on the rest of Commonwealth Avenue, from Chestnut Hill Avenue east to existing tracks at Packard's Corner, later part of the "A" Branch. This enabled trains to use Commonwealth Avenue between Lake Street and Kenmore Square. In 1909, the tracks were electrified.〔(【引用サイトリンク】title=Cleveland Circle History )〕 The Tremont Street Subway opened on September 1, 1897 and then or soon after the Commonwealth Avenue line was rerouted to turn around at Park Street via the Boylston Street Incline at the Public Garden. The Boylston Street Subway opened on October 3, 1914, extending the underground portion to the Kenmore Incline just east of Kenmore Square. On October 23, 1932 the Blandford Street Incline opened along with the underground Kenmore station, giving the line its present configuration. Until the 1920s, a streetcar line that has since become the 65 bus ran along Commonwealth Avenue from Boston College east to Chestnut Hill Avenue, then south on Chestnut Hill Avenue and east on Beacon Street from Cleveland Circle to Washington Square, turning southeast to Brookline Village. After this was replaced by bus service in the 1920s (along with a rerouting), no revenue service used the tracks on Chestnut Hill Avenue, but they have remained for "B" Branch trains to access the Reservoir Carhouse at Cleveland Circle on the "C" Branch. A turnback loop at Boston University Field was present from 1915 to January 14, 1962. It was used for service to special events as well as to short-turn some rush hour trains. From 1942 to 1967, the route was known by the map number of 62. In 1967, the lines were given colors and the Green Line branches were lettered. The Commonwealth Avenue Line became the "B" Branch. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Green Line "B" Branch」の詳細全文を読む スポンサード リンク
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