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|image = PCC inbound at Milton.jpg |image_width = 320px |caption = An inbound PCC car at Milton |type = Light rail |system = |status = |locale = Boston, Massachusetts (Dorchester to Mattapan) via Milton, Massachusetts |start = Ashmont |end = Mattapan |stations = 8 |routes = 1 |ridership = 4,637 |open = August 26, 1929 (Ashmont to Milton) December 21, 1929 (Milton to Mattapan) |close = |owner = MBTA |operator = MBTA |character = Private right-of-way (largely grade-separated) |stock = PCC streetcar |linelength = |tracklength = |notrack = |gauge = |minradius = |el = 600V Overhead lines |speed = |elevation = |map = |}} The Ashmont–Mattapan High Speed Line, also known as the "M-Line", is a partially grade-separated light rail line which forms part of the MBTA's Red Line rapid transit line. The line, which runs through Boston and Milton, Massachusetts, opened on August 26, 1929 as a conversion of a former commuter rail line and exclusively uses historic PCC streetcars for rolling stock. Passengers must transfer at Ashmont to access the rest of the Red Line, which uses heavy rail metro rolling stock. The term "high speed line" is a historic vestigial designation, distinguishing the exclusive and largely grade-separated right-of-way at a time when most trolleys ran down streets shared with automobiles. The route is used only by streetcars and has just two public grade crossings. All stations have low platforms, but all except Valley Road have been retrofitted with wheelchair lifts or wooden ramps for handicapped accessibility. ==History and route== The Ashmont–Mattapan Line follows the right-of-way of the Dorchester and Milton Branch Railroad, opened December 1847. It became part of the Old Colony Railroad and then the New York, New Haven and Hartford Railroad after 1893. Steam trains were discontinued in 1927 and the line was closed for two years while it was modified for streetcars. There was a debate at that time whether or not to continue subway trains from Boston to Ashmont onwards to Mattapan, but the cost of full-scale subway service was apparently too high for the BERy which then operated it. The line opened from Ashmont to Milton on August 26, 1929, and from Milton to Mattapan on December 21, 1929.〔 The portion of the line from Ashmont to Cedar Grove and through a cemetery follows the path of the original Shawmut Branch of the Old Colony Railroad, which opened in 1872. The cemetery is where the Shawmut Branch intersects with the original Dorchester and Milton Branch. The right-of-way is owned by the MBTA and has only two at-grade crossings on its route. The line's longest shutdown started June 24, 2006 while the Ashmont and Mattapan stations were renovated. Service was restored on December 22, 2007. Several of the stations have been renovated for better accessibility and modernization; all stations are now wheelchair-accessible except Valley Road, which is down a grade from the nearest road with no room for a ramp. 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「Ashmont–Mattapan High Speed Line」の詳細全文を読む スポンサード リンク
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