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Downtown Relief Line
The Downtown Relief Line (DRL), or simply the Relief Line in official literature, is a proposed subway line in Toronto, Canada, intended to provide capacity relief to the Yonge Line and Bloor-Yonge station and extend subway service coverage. Several routes are being considered. Several plans for an east-west downtown subway date back to the early 20th century, most of which ran along Queen Street.〔 Recent studies propose a line that would run south from Line 2 Bloor–Danforth, before bending westward into downtown. Potential extensions could be made northward from its Line 2 connection in the east, as well as westward and northward from downtown to form a U-shape.〔
==Purpose==
The main rationale for the DRL is to reduce congestion on the Yonge line, particularly at Bloor-Yonge Station, the main interchange with Line 2 Bloor–Danforth. As of 2015, the Yonge line operates 11% over its capacity south of Line 2 during the morning rush hour. The new Toronto Rocket trains operating on the line, and the future implementation of Automatic Train Control will help increase the capacity of the Yonge line. Other factors are expected to reduce demand such as the extension of the University-Spadina portion of Line 1 into Vaughan, and other local transit improvements. But after factoring in population and employment growth and extending the Yonge line into Richmond Hill, the Yonge line is projected to be at 96% of its capacity by 2031.
With the growth of downtown and the GTA as a whole, the DRL is expected to serve additional roles. The line will serve high-density "shoulder areas" of downtown such as Liberty Village, CityPlace, the Entertainment District, Distillery District, and West Don Lands.〔http://ttc.ca/About_the_TTC/Commission_reports_and_information/Commission_meetings/2012/October_24/Reports/Downtown_Rapid_Trans.pdf〕 These neighbourhoods lack good higher order transit options and are experiencing an influx of high-rise transit-oriented development. Two of TTC's busiest surface transit routes, the 504 King and 501 Queen streetcars, serve these areas. 504 King is the TTC's busiest route averaging 57,300 weekday riders〔https://www.ttc.ca/About_the_TTC/Transit_Planning/Surface_Ridership_2012.jsp〕 and roughly follows the proposed alignment of the DRL.
Metrolinx has supported a version of the DRL to alleviate the projected overcrowding of Union Station from current and future improvements to GO Transit services. The cost is estimated at C$6.2 billion to 8.3 billion depending on alignment and phasing.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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