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The Massachusetts Bay Transportation Authority (MBTA) maintains a large public transit system in the Boston, Massachusetts area, and uses various methods to name and number their services for the convenience of users. ==Subway== The subway system consists of four trunk lines, all of which meet downtown. Each is assigned a color, as follows: *The Red Line used to terminate at Harvard University. *The Green Line runs to the western suburbs, notably Brookline and Newton. Its color assignment derives from the Emerald Necklace, a string of parks that the line's "D" branch operates through. *The Orange Line's trains were colored orange when they were run by the Boston Elevated Railway. Also, it runs under part of Washington Street, a piece of which was called Orange Street until 1788. *The Blue Line runs under Boston Harbor and to Revere Beach. The Red Line has two branches, in the south, called by their terminals - Ashmont and Braintree. Additionally, the Ashmont-Mattapan High Speed Line, a streetcar line to Mattapan, is also colored red. Some trains use the letters A, B and C for Ashmont, Braintree and Alewife (the north terminal) respectively. The Green Line is a streetcar/light rail system with four branches to the west, labeled "B" to "E" from north to south. The trains operate underground in the downtown area; outside of downtown, all but the "D" branch run along city streets, with frequent grade crossings at intersections. Rollsigns and newer electronic signs use the following labels: *B Boston College via Commonwealth Avenue *C Cleveland Circle via Beacon Street *D Riverside via Highland Branch *E Heath Street via Huntington Avenue The above color explanations are anecdotal. The architectural firm Cambridge Seven designed the color scheme using aesthetic guidelines. The group actually had yellow picked out for the Orange Line, but changed it because yellow did not contrast well with white. According to the firm's newsletter, "50 Years, Fifty Stories", orange was the last marker on the table. See also boston.com, "MBTA Orange Line's 111th anniversary." The "E" branch of the Green Line ran to Forest Hills/Arborway until 1985, when the line was "temporarily" cut back to Heath Street. As of , the Green Line has still not been re-extended to Forest Hills, and the in-street tracks beyond Heath Street have been paved over. 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「MBTA nomenclature」の詳細全文を読む スポンサード リンク
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