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Red Line |ridership = 45,355 (average weekday Feb. 2013) |open = September 28, 1969 |close = |owner = |operator = Chicago Transit Authority |character = Highway median, Elevated |stock = 5000-series |linelength = |tracklength = |notrack = |gauge = |minradius = |el = Third rail, 600 V DC |speed = |elevation = |map = |}} The Dan Ryan Branch, or the South Red Line, is a long section of the Chicago 'L' system located on the South Side of Chicago, Illinois. It is operated by the Chicago Transit Authority, as part of its Red Line service and is normally through-routed downtown; towards the North Side via the State Street Subway. As of February 2013, the branch serves (on average) 45,355 passengers per weekday. As part of the CTA's busiest rapid transit line, it is operated 24 hours a day, 365 days a year. The Dan Ryan Branch was shut down at 2 a.m. on May 19, 2013 and service to and from Howard via the State Street Subway was rerouted through the old 13th street portal onto the Green Line's South Side Main Line tracks to Garfield. After Garfield, the Red Line continued to the Englewood Branch of the Green Line, and terminated at Ashland/63rd until October 19, 2013. This was the old routing of the Howard-Englewood A of the North-South route from 1949 until 1993. On October 20, 2013, the branch reopened at 4 a.m. ==History== After World War II, the CTA built three new branches of the 'L' through the medians of freeways. The first was the Congress Branch, which opened on June 22, 1958. On July 30, 1958, proposals for a line in the median of the Dan Ryan Expressway and a line in the median of the Kennedy Expressway were among a series of projects proposed by the CTA.〔(Chicago Transit Authority Proposed $315,000,000, Twenty-Year Transit Expansion and Improvement Program ) Chicago Transit Authority. July 30, 1958. Accessed August 21, 2013〕 The Dan Ryan Branch was built between 1967 and 1969 for a total cost of $38 million. When the branch opened on September 28, 1969, it was connected to the Lake Street Elevated via the Loop and the South Side Main Line. The branch was successful from the start, exceeding forecasts by 10%, and carrying an average of 99,000 passengers per day by the end of 1970. The opening of the Dan Ryan branch resulted in a decrease in ridership on the South Side Elevated and its two branches to Englewood and Jackson Park. On January 4, 1978, several large cracks were discovered under the elevated portion of the Dan Ryan Branch near Clark and 18th Streets. Service was suspended on this portion of the branch from January 4 to January 17, while repairs were being made. On February 21, 1993, when the L routes were to be color-coded, the Dan Ryan branch became part of the present day Red Line. The CTA had decided that the Dan Ryan Branch's routing was inefficient due to the fact that the Dan Ryan Branch and North Side Main Line had a comparatively higher number of riders than the Lake Branch and South Side Elevated. On February 21, 1993, the Dan Ryan Branch was connected to the State Street Subway and the North Side Main Line with service to Howard, while the Lake Branch would be paired with the South Side Elevated and its Englewood and Jackson Park branches via The Loop. The Dan Ryan Branch connected to the State Street Subway via the subway's new extension to 16th and Wentworth, which was built from 1985 to 1990. The Dan Ryan Branch initially used concrete railroad ties, but these were replaced by wooden ties after the concrete ties began to age more rapidly than expected. On April 17, 2004, the CTA began a $192,500,000 rehabilitation of the Dan Ryan Branch, which included installing a new signal system, replacing and upgrading substations, renovating platform canopies, and installing new elevators at the 47th and 69th Street stations. 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「Dan Ryan branch (CTA)」の詳細全文を読む スポンサード リンク
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