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The Archer Avenue Lines are two rapid transit lines of the New York City Subway, mostly running under Archer Avenue in the Jamaica neighborhood of Queens. Conceived as part of the Metropolitan Transportation Authority's 1968 expansion plans, they opened on December 11, 1988. The two lines are built on separate levels, served by trains from the IND Queens Boulevard Line () on the upper level, and the BMT Jamaica Line () on the lower. Since the two levels share no track connections and have different chainings and radio frequencies, they are two separate lines—the B2 (IND) Division Archer Avenue Line (upper level) and the B1 (BMT) Division Archer Avenue Line (lower level). ==Extent and service== The following services use the Archer Avenue Line: The two Archer Avenue Lines begin at a northern (geographic eastern) terminal, Jamaica Center – Parsons/Archer (), as a bi-level subway, each level having two tracks.〔 The two lines run compass west along Archer Avenue to another station at Sutphin Boulevard – Archer Avenue – JFK Airport, where connections can be made to the Long Island Rail Road and AirTrain JFK. West of this station, the two levels diverge. The lower level tracks () continue roughly compass northwest, emerging from a portal near 89th Road and 130th Street and paralleling the Main Line of the LIRR before turning west onto the elevated structure of the BMT Jamaica Line at about 127th Street.〔〔 The upper level tracks () turn compass north under the Van Wyck Expressway, with another station at Jamaica Avenue.〔〔 Just north of Hillside Avenue, they meet the four tracks of the IND Queens Boulevard Line at a flying junction, with connections to both the local and express tracks.〔〔〔 Jamaica Center – Parsons/Archer was not intended to be the lines' northern terminal, as there are spurs on both levels for possible future extensions. On the lower level, they continue one train length and end with at bumper blocks. This was a planned extension toward 190th Street – Hollis Avenue.〔 Where the lower level tracks end, there is a provision for a diamond crossover switch at the end of the tunnel (under 160th Street). On the upper level, the tracks curve south to run under 160th Street and stop at about South Road, also ending at bumper blocks.〔 The plan was for this line to use the LIRR Atlantic Branch ROW and run to Springfield Boulevard or Rosedale. Where the upper level tracks stub end, there is a provision for a portal to go outside if the line going to Southeastern Queens is ever built.〔〔 The tail tracks on both levels are currently used for storage. 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「Archer Avenue Lines」の詳細全文を読む スポンサード リンク
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