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Orange Line Green Line Purple Line weekday rush hours only Brown Line Pink Line |ridership = 74,651 (average weekday 2012) |open = 1895–1897 |close = |owner = |operator = Chicago Transit Authority |character = Elevated |stock = |linelength = |tracklength = |notrack = 2 |gauge = | minradius = |el = Third rail, 600v DC |speed = |elevation = |map = |}} The Loop (historically Union Loop, or commonly Loop) is the long circuit of elevated railroad that forms the hub of the Chicago 'L' rapid transit system in Chicago, Illinois. As of 2012, the branch has served 74,651 passengers every weekday. The Loop is so named because the railroad loops around a rectangle formed by Lake Street (north side), Wabash Avenue (east), Van Buren Street (south), and Wells Street (west). The railroad loop has given its name to Chicago's downtown, which is known as the Loop. Numerous accounts assert that the use of this term predates the elevated railroad, deriving from the multiple cable car turntables, or loops, that terminated in the district, and especially those of two lines that shared a loop, constructed in 1882, bounded by Madison, Wabash, State, and Lake.〔(Joe Thompson, ''Cable Car Lines in Chicago'' )〕 However, transportation historian Bruce Moffat has concluded that "The Loop" was not used as a proper noun until after Charles Yerkes' 1895–97 construction of the elevated structure.〔Patrick T. Reardon. ("It All Starts Downtown" ). ''Hartford Courant'', July 26, 2004 (from the ''Chicago Tribune''). Accessed 19 March 2009.〕 ==Operations== The Loop includes eight stations: Clark/Lake and State/Lake are on the northern leg; Randolph/Wabash and Adams/Wabash are on the eastern side; Library and LaSalle/Van Buren are on the southern leg; and Quincy and Washington/Wells are on the western side. In 2011 20,896,612 passengers entered the 'L' via these stations. Five of the eight 'L' lines use the Loop tracks. Two of the remaining three lines, Blue Line and Red Line, run underground through the center of the loop, connecting to Loop stations. The Yellow Line is the only CTA line that does not run on or connect to the loop. The Purple Line Express (weekday rush hours only) and the Brown Line enter from the north at the northwestern corner. The Purple Line Express makes a full circuit in the clockwise direction while the Brown Line makes a full circuit traveling counterclockwise. The Orange Line enters from the south at the southeastern corner and the Pink Line enters from the west at the northwestern corner; both making a full clockwise circuit. Following the completion of a full circuit in their respective directions, trains of these four lines return to their terminals making stops in the reverse order they made when heading to the Loop. The Green Line runs in both directions but does not make a full circuit, using only the north and eastern sides of the Loop to move between the Lake Street Line and the South Side Elevated. Two towers control entry to and exit from the Loop. Tower 12 stands at the southeastern corner. Tower 18 stands watch over the three-quarter union located at the northwestern corner, which at one time was billed as the busiest railroad interlocking in the world. The current Tower 18 was placed into service on September 7, 1969 after being relocated diagonally across the junction from the original 19th century tower.〔 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「The Loop (CTA)」の詳細全文を読む スポンサード リンク
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