The Green Line is a rapid transit line in Chicago, Illinois, operated by the Chicago Transit Authority (CTA) as part of the Chicago "L" system. It is the only completely elevated route in the "L" system. All other routes may have various combinations of elevated, subway, street level (at grade), or freeway median sections.^[1]

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Green Line
A Cottage Grove-bound Green Line train of 5000-series cars approaching the Roosevelt station.
Overview
Status	Operational
Locale	Chicago, Oak Park and Forest Park, Illinois, United States
Termini	Harlem Ashland/63rd, Cottage Grove
Stations	30
Website	CTA Green Line
Service
Type	Rapid transit
System	Chicago "L"
Operator(s)	Chicago Transit Authority
Depot(s)	Ashland Yard, Harlem Yard
Rolling stock	5000-series 6 car trains (typical); 8 car maximum
Daily ridership	19,018 each weekday (2022)
History
Opened	February 21, 1993; 31 years ago (1993-02-21) (Current operation)
Technical
Line length	20.695 mi (33.305 km)
Character	Elevated
Track gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Minimum radius	90 feet (27 m)
Electrification	Third rail, 600 V DC
Route map Green Line highlighted in green Show interactive map Legend UP-W to Elburn Harlem/Lake | Oak Park Oak Park Ridgeland Oak Park Chicago Austin Central Laramie Cicero Pulaski Conservatory– Central Park Drive Homan demolished Kedzie California Damen opening 2024 Pink to 54th/Cermak Ashland Morgan Halsted demolished Clinton Ogilvie T.C. UP-N UP-NW UP-W Chicago River BrownOrangePinkPurple Blue to O'Hare Clark/Lake Blue to Forest Park | Red to Howard State/Lake ■ Lake Randolph/Wabash demolished 2017 Washington/​Wabash Madison/Wabash demolished 2015 Adams/Wabash BrownOrangePinkPurple Roosevelt Orange to Midway Cermak– McCormick Place 35th–Bronzeville–IIT Indiana 43rd 47th 51st Garfield 58th demolished 61st demolished King Drive Cottage Grove University demolished RI Red to 95th/Dan Ryan | I-90 / I-94 SWS Halsted Racine closed 1994 Ashland/63rd Direct connection outside of paid area Other line sharing Green Line tracks Multiple lines sharing Green Line tracks Bus connections available at all stations except Morgan and Conservatory This diagram: view talk edit Show BSicon diagram map

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The Green Line utilizes the system's oldest segments, dating back to 1892. It extends for 20.695 miles (33.305 km), with 30 stops between Oak Park/Forest Park (Harlem/Lake) and Chicago's West Side, to the Loop, and then to the South Side neighborhoods of West Englewood (Ashland/63rd) and Woodlawn (Cottage Grove/63rd). As of 2022, 19,018 passengers board this line each weekday.^[2]

The Green Line operates weekdays from 4 a.m. to 1 a.m., and Saturdays and Sundays from 5 a.m. to 1 a.m. Between Harlem/Lake and Garfield, trains run on a minimum headway of 12 minutes, decreasing to as few as 10 minutes during weekday rush hours. Headways are doubled on the branches to Ashland/63rd and Cottage Grove.^[3]

The Green Line is operated with the Bombardier-built 5000-series railcars. The 5000-series cars officially began running on the Green Line on July 1, 2012, after the Pink Line became fully equipped with the new cars. As additional 5000-series cars were assigned to the Green Line, the remaining 2400-series cars were reassigned to the Red, Purple and Orange Lines to finish their service lives. Occasionally, 2600-series and 3200-series railcars were used on the Green Line, though these were loaned from the Blue, Brown, and Orange Lines, and only when the Green Line was short on cars.

With the 5000-series cars now completely equipping the Green Line fleet after the last of the 2400-series cars were reassigned in mid-May 2013, the borrowing of 2600-series cars and 3200-series cars is no longer necessary. The Green Line was the second line to be fully equipped with the 5000-series cars, following the Pink Line. Frequently, the Green and Pink Lines borrow each other's cars when either line is short on cars. Trains operate using six cars full time as of 2020.

This section does not cite any sources. (March 2024)

The Green Line operates over the two oldest sections of the Chicago "L". The South Side section started operation in 1892 when Chicago was preparing for the World's Columbian Exposition of 1893 in Jackson Park. The initial section was built to provide inexpensive mass transportation service between downtown Chicago and the exposition site. This first section of the Chicago and South Side Rapid Transit Railroad between Wabash Avenue and State Street went into service on June 6, 1892.^[4] It extended from Congress Street only as far south as 39th Street (Pershing Road). At that time a large part of the south side was little more than prairie, but by May 1, 1893, when the pioneer "L" line was completed to Jackson Park, construction of homes, apartment buildings and commercial properties was booming in the area.

Continued expansion of the area development was reflected in construction of the Englewood, Normal Park, Kenwood and Stock Yards branches of the South Side "L" between 1905 and 1908. Of these, only the Englewood and Jackson Park branches remain: because of insufficient patronage, the Normal Park, Stock Yards and Kenwood branches were closed in the 1950s.

The Lake Street Elevated was Chicago's second rapid transit line. It began operation from a terminal at Madison and Market streets to Lake Street and California Avenue on November 6, 1893.^[5] The line was gradually extended westward to Laramie Avenue on April 29, 1894; to Austin Avenue on April 15, 1899;^[6] to Wisconsin Avenue, Oak Park using street railway trackage on May 15, 1899 (closed in 1902), and to Marengo Avenue, Forest Park, on May 14, 1910.

The construction of the Lake Street Elevated led to a political quarrel in west suburban Cicero, which at the time included Oak Park and Austin. In 1898, Austinites, having a majority on Cicero's town council, used political influence to allow the extension of the Lake Street line from the city border at Laramie Avenue (then called 52nd Avenue) into their community. This infuriated other Cicero residents, who retaliated the following year by holding a joint election to force Austin's annexation to the City of Chicago. Much to the dismay of local residents, this effort succeeded, and Austin became part of Chicago in 1899. A century later, Oak Park commuters, who had come to depend on the service, were among the most vocal critics of the Green Line's closure for rehabilitation.

From 1913 until 1993, the Englewood and Jackson Park branches were part of the North–South Route in various service configurations operating from the north side through the Loop and to the south side. On October 17, 1943, the Englewood and Jackson Park services were rerouted into the State Street subway to provide improved crosstown access through the heart of city and to alleviate congestion on the over-crowded Union Loop Elevated. On July 31, 1949, during the north–south rapid transit service revision by the CTA, the Howard–Englewood/Jackson Park route was created, operating via the State Street subway, using the 13th Street portal.

On May 6, 1969, the Englewood branch was extended to the current Ashland Avenue-West Englewood Terminal, replacing the outmoded facilities at the 1907-built Loomis station which were demolished. On December 12, 1982, the Jackson Park branch was shortened to University because of structural deterioration at the Dorchester Bridge which carried the route across the Illinois Central Railroad to the former Stony Island/63rd terminal which closed on March 4, 1982, and was later demolished.

The Lake Street "L" would remain largely unchanged until 1948, when a number of its historic passenger stations were closed and demolished in an attempt to promote the "A" and "B" skip-stop express train service to speed up traffic flow. On October 28, 1962, the western two and one-half mile section of the line which operated at street level was elevated along the Chicago and Northwestern Railroad right-of-way opening new elevated stops at Central, Austin, Ridgeland, Oak Park, and Harlem.

In September 1969, the Lake Street "L" was united with the new Dan Ryan Line to form the West–South Route (Lake-Dan Ryan), operating from Forest Park through downtown via the Union Loop "L" to 95th/Dan Ryan. The Lake–Dan Ryan routing was to fulfill the service implementation outlined in the 1968 Chicago Central Area Transit Plan. However, when that subway project was canceled in 1979, Lake–Dan Ryan service remained and lasted for 24 years.

In February 1993, the South Side sections of the North–South and West–South Routes were "switched" south of Roosevelt Road, creating the current Red Line (Howard–Dan Ryan) and the Green Line (Lake–Englewood/Jackson Park). After the reconfiguration, both the Red and Green Lines lost their "A" and "B" skip-stop service and began serving all stations at all times. As stated earlier, the Green Line's routing united the two oldest segments of Chicago's "L"-Subway rail network.

In January 1994, the Green Line closed for the largest transit rehabilitation project in the city's history. The Green Line reopened on May 12, 1996, with much of the renewal work completed and with the exception of a few stations. Six stations (Homan, Halsted, 58th, 61st, University, and Racine) were closed permanently following the rehabilitation project, which angered many commuters who depend on the Green Line.

In September 1997, after political pressure brought on by community leaders, the Jackson Park branch was shortened again from University to Cottage Grove after previous attempts by the city, CTA, and other agencies to extend the route eastward to Dorchester, immediately west of the Illinois Central Railroad. This had seemed logical to the Dorchester Terminal, due to the fact that the Metra Electric District and South Shore Line both share a station along the IC ROW, at 63rd Street.

In April 1998, the Green Line, like the Purple Line and the Douglas branch of the Blue Line (now the Pink Line) lost its 24-hour service due to budget cuts, and operates only between the hours of 4 a.m. and 1 a.m weekdays.

During the 2010s, the Green Line has undergone significant expansion in an attempt to attract more transit riders and improve upon its service connectivity on the West Side, Loop, and South Side communities. The Morgan/Lake station opened in May 2012 in response to the growing Fulton Market and West Loop areas. It was followed by the opening of the new Cermak–McCormick Place station in February 2015, serving the historic Motor Row District and McCormick Place Convention Center. Both stations were designed by Chicago-based Ross Barney Architects.

The Garfield station's $43 million reconstruction project, completed in January 2019, restored its original 1892-built station house and improved the in-service station house. It included escalator and elevator enhancements and new platform canopies, lights, graphics, public artwork, and streetscape. The project created a new "Garfield Gateway" station in the Washington Park neighborhood on the South Side.

A new station is being constructed on the Lake Street "L" at Damen/Lake, replacing a former station at that site from 1893 to 1948. Designed by world-renowned architectural firm Perkins + Will, who also designed the Cumberland station on the O'Hare Extension in 1980, the new $60 million Damen station will fill the 1.5-mile distance between the California and Ashland stations.

Along the Green Line South, the former 58th Street station, which was located approximately 3/8 mile south of the Garfield station and one-block north of the Englewood and Jackson Park branches, had been bereft of a transfer facility between the diverging Green Line services since 1994. The branch lines themselves consists of only two stations (Halsted and Ashland/63rd on the Englewood branch; King Drive and Cottage Grove on the Jackson Park Branch).

While no official plans have been developed to build future stations on the Green Line South, the possibility of a new Stony Island/63rd terminal station to serve Hyde Park, South Shore, the Museum of Science and Industry, and the proposed Barack Obama Presidential Center would be very advantageous. A major benefit would be the resurgence of passenger and traffic volumes on the Englewood and Jackson Park branches to those prior to 1982, with more modern, attractive, and convenient transit service on the South Side "L", thus supplementing, and not competing with the Dan Ryan branch of the Red Line.