The Chicago "L" is the rapid transit system serving the city of Chicago and some of its surrounding suburbs in the U.S. state of Illinois. Operated by the Chicago Transit Authority (CTA), it is the fourth-largest rapid transit system in the United States in terms of total route length, at 102.8 miles (165.4 km) long as of 2014, and the third-busiest rapid transit system in the United States after the New York City Subway and the Washington Metro. As of January 2024, the "L" had 1,480 rail cars operating across eight different routes on 224.1 miles of track. CTA trains make about 1,888 trips each day servicing 146 train stations. In 2023, the system had 117,447,000 rides, or about 416,200 per weekday in the third quarter of 2024.
The Red Line is a rapid transit line in Chicago, run by the Chicago Transit Authority (CTA) as part of the Chicago "L" system. It is the busiest line on the "L" system, with an average of 108,303 passengers boarding each weekday in 2023 The route is 26 miles (42 km) long with a total of 33 stations. It runs elevated from the Howard station in the Rogers Park neighborhood on the North Side, through the State Street subway on the Near North Side, Downtown, and the South Loop, and then through the Dan Ryan Expressway median to 95th/Dan Ryan in the Roseland neighborhood on the South Side.
The Blue Line is a 26.93-mile-long (43.34 km) Chicago "L" line which runs from O'Hare International Airport at the far northwest end of the city, through downtown via the Milwaukee–Dearborn subway and across the West Side to its southwest end in Forest Park, with a total of 33 stations. At about 27 miles, it is the longest line on the Chicago "L" system and second busiest, and one of the longest local subway/elevated lines in the world. It has an average of 72,475 passengers boarding each weekday in 2023.
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, or freeway median sections. This line is also the only route with three terminals: trains departing Harlem/Lake alternate destinations between Ashland/63rd and Cottage Grove.
The Purple Line of the Chicago "L" is a 3.9-mile (6.3 km) route on the northernmost section of the system. The service normally begins from Linden in Wilmette and ends at Howard on Chicago's north border, passing through the city of Evanston.
The Chicago Central Area Transit Plan, generally referred to as the Chicago Central Area Transit Project (CCATP) in the 1970s, was an extensive study of the rapid transit system in downtown Chicago; the study had begun in 1965.
The Pink Line is an 11.2 mi (18.0 km) rapid transit line in Chicago, run by the Chicago Transit Authority (CTA) as part of the Chicago "L" system. It is the CTA's newest rail line and began operation for a 180-day trial period on June 25, 2006, running between 54th/Cermak station in Cicero, Illinois and the Loop in downtown Chicago. As the line enters downtown Chicago, it begins to share tracks with Green Line trains on Lake Street. This connection is handled by the previously non-revenue Paulina Connector set of tracks. In 2023, over 3 million passengers boarded Pink Line trains.
Armitage is a Chicago Transit Authority "L" elevated station with two side platforms in the Lincoln Park neighborhood of Chicago, Illinois, on the Brown Line; Purple Line express trains also stop at the station during weekday rush hours. Red Line trains pass through on the middle tracks, but do not stop. Just south of the platforms is where the Red Line tracks descend into the State Street subway. It is located near the Lincoln Park Zoo, and is accessible via the 73 Armitage bus route.
Racine is an 'L' station on the CTA's Blue Line. The station serves the Near West Side neighborhood and the western end of the UIC campus.
The Dan Ryan branch is a 9.4 mi (15.1 km) 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 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 branch serves the Chinatown, Armour Square, Fuller Park, Englewood, Greater Grand Crossing, Chatham and Roseland neighborhoods.
The Lake–Dan Ryan Line was a rail rapid transit route formerly operated by the Chicago Transit Authority (CTA). The Lake–Dan Ryan Line existed from the opening of the Dan Ryan branch on September 28, 1969, until February 21, 1993. When created, the route united two transit corridors that until 1969 never had through rail service. This routing, which became known as the West-South route, operated from the Harlem terminal in Forest Park on the Lake Street "L" through downtown Chicago along the Union Loop "L", and then via the old South Side "L" and the new Dan Ryan Line to the 95th Street Terminal. The Lake–Dan Ryan service was planned in conjunction with the former Franklin Street Connector and Chicago Central Area Transit Project, both of which were never constructed. The section of the route between the junction with the South Side "L" at 17th and State Streets and the Cermak–Chinatown Station was originally an "interim", or temporary facility. It was planned to be torn down when the Loop Subway system was completed, but survived after the project was canceled in 1979. That section was improved in the 1980s and early 1990s and is currently being used by the Orange Line. Train transfers are possible by using the two unused tracks.
The North Side Main Line is a branch of the Chicago "L" system that is used by Red, Purple, and Brown Line trains. As of 2012, it is the network's busiest rail branch, serving an average of 123,229 passengers each weekday. The branch is 10.3 miles (16.6 km) long with a total of 21 stations, from Howard Street in Rogers Park down to Lake Street in Chicago's Loop. The branch serves the north side of the city 24 hours a day, seven days a week.
The State Street subway is an underground section of the Chicago "L" system, carrying the Red Line through the Chicago Loop. The subway is 4.9 mi (7.9 km) long, running underneath Clybourn Avenue, Division Street, and State Street. Red Line trains run through the State Street subway 24/7, with trains arriving every 4 to 15 minutes. As of August 2024, the subway's 9 stations serve 52,664 boardings per average weekday.
The Lake Street Elevated, also known as the Lake branch, is a 8.75 mi (14.08 km) long branch of the Chicago "L" which is located west of the Chicago Loop and serves the Green Line for its entire length, as well as the Pink Line east of Ashland Avenue. As of February 2013, the branch serves an average of 27,217 passengers each weekday. It serves the Near West Side, East Garfield Park, West Garfield Park, and Austin neighborhoods of Chicago, as well as the suburbs Oak Park and Forest Park. It owes its name to Lake Street, the street that the branch overlooks for 6.25 mi (10.06 km) before continuing its route straight west, adjacent to South Boulevard, towards the terminus at Harlem/Lake.
The Humboldt Park branch was a rapid transit line which was part of the Chicago "L" system from 1895 to 1952. The branch served the West Town and the Humboldt Park neighborhoods of Chicago and consisted of six elevated stations. It opened on July 29, 1895, and closed on May 4, 1952.
The Garfield Park Branch was a rapid transit line which was part of the Chicago "L" system from 1895 to 1958. The branch served Chicago's Near West Side, East Garfield Park, West Garfield Park, and Austin neighborhoods, and the suburbs of Oak Park, and Forest Park, and consisted of twenty-two stations. It opened on June 19, 1895 and closed on June 22, 1958, when it was replaced by the Congress branch of the Blue Line.
The Logan Square branch was an elevated rapid transit line of the Chicago "L", where it was one of the branches of the Metropolitan West Side Elevated Railroad. Diverging north from the Metropolitan's main line west of Marshfield station, it opened in 1895 and served Chicago's Logan Square and West Town neighborhoods. North of Damen station, the Humboldt Park branch diverged from the Logan Square branch, going west to serve Humboldt Park. The original Logan Square branch was separated into several sections in 1951, some of which remain in revenue service as of 2023.
The Chicago "L" used skip-stop service, wherein certain trains would stop only at certain designated stations on a route, from 1948 to 1995. It was implemented as a way to speed up travel within a route, and was one of the Chicago Transit Authority's first reforms upon its assumption of the "L"'s operations.
The Lake Street Transfer station was a rapid transit station on the Chicago "L", serving as a transfer station between its Lake Street Elevated Railroad and the Logan Square branch of its Metropolitan West Side Elevated Railroad. Located where the Logan Square branch crossed over the Lake Street Elevated, it was in service from 1913 to 1951, when it was rendered obsolete by the opening of the Dearborn Street subway.
Grand was a rapid transit station on the Chicago "L"'s Logan Square branch, one of the several branches of the Metropolitan West Side Elevated Railroad. Located on Grand Avenue, the station was constructed by the Metropolitan in the early 1890s and began service on May 6, 1895.
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