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The Lexington Avenue Line (also known as the East Side Line) is one of the lines of the IRT division of the New York City Subway, stretching from Downtown Brooklyn or Lower Manhattan north to 125th Street in East Harlem.〔MTA Capital Construction, Second Avenue Subway, (Supplemental Draft Environmental Impact Statement ), 〕 The portion in Lower and Midtown Manhattan was part of the city's first subway line. The line is served by the . The line is also known as the IRT East Side Line, as it is currently the only line in Manhattan to directly serve the Upper East Side and East Midtown; this four-track line is the most used rapid transit line in the United States. Its average of 1.3 million daily riders is "more than the combined ridership of San Francisco, Chicago, and Boston’s entire transit systems." Its ridership also exceeds that of the 798,456 daily trips on the entire Washington Metro,〔 〕 and in part spurred the construction of the Second Avenue Subway starting in 2007.〔 〕 Several stations along this line have been abandoned. When platforms were lengthened to fit ten cars, it was deemed most beneficial to close these stations and open new entrances for adjacent stations. For example, 14th Street – Union Square has an entrance on 16th Street and 23rd Street has an entrance on 22nd Street, so the 18th Street station was abandoned because of the proximity to both 14th Street – Union Square and 23rd Street. ==Extent and service== Services that use the Lexington Avenue Line are colored . The following services use part or all of the Lexington Avenue Line: The Lexington Avenue Line begins in lower Manhattan at the inner loop of the abandoned South Ferry station. North of the station is a merge with the tracks of the Joralemon Street Tunnel from Brooklyn, which become the express tracks. These run north under Broadway and Park Row to Centre Street. At the south end of Centre Street, directly under New York City Hall, is the City Hall Loop and its abandoned station, which was the southern terminus of the original IRT subway line. The loop is still used to turn 6 and <6> service; the Lexington Avenue local tracks, which feed the loop, rise up to join the express tracks just south of Brooklyn Bridge – City Hall station. From Brooklyn Bridge, the line continues northward in a four-across track layout under Centre Street, Lafayette Street, Fourth Avenue, and Park Avenue South until 42nd Street. At this point, the beginning of Metro-North Railroad's Park Avenue tunnel in Grand Central Terminal forces the Lexington Avenue Line to shift slightly eastward to Lexington Avenue; its Grand Central – 42nd Street station is located on the diagonal between Park and Lexington. Just south of Grand Central, a single non-revenue track connects the IRT 42nd Street Shuttle to the southbound local track; this was part of the original IRT subway alignment. Under Lexington Avenue, the line assumes a two-over-two track configuration, with the local tracks running on the upper level and the express on the lower, although it briefly returns to a four-across layout between 96th Street and 116th Street. 125th Street returns to this two-over-two layout, although here the upper level is used by all northbound trains and the lower level by southbound trains. North of this, the line crosses under the Harlem River into the Bronx via the Lexington Avenue Tunnel and a flying junction marks its end, where it splits into the IRT Jerome Avenue Line (4 and 5) and the IRT Pelham Line (6 and <6>). 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「IRT Lexington Avenue Line」の詳細全文を読む スポンサード リンク
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