The Loop
A Brown Line train passes through Tower 12 as it makes the turn from Van Buren onto Wabash, while an Orange Line train waits for it to clear
LocaleChicago, Illinois, USA
TypeRapid transit
SystemChicago "L"
ServicesOrange Green Purple Brown Pink
Operator(s)Chicago Transit Authority
Daily ridership74,148 (average weekday 2016)[1]
Track length1.79 miles (2.9 km)
Number of tracks2
Track gauge4 ft 8+12 in (1,435 mm) standard gauge
Minimum radius90 feet (27 m)
ElectrificationThird rail, 600 V DC
Route map

(closed 1899)
(closed 1995)
(closed 2017)
(closed 1994)
(closed 2015)
LaSalle/Van Buren
Dearborn/Van Buren
(closed 1949)

The Loop (historically Union Loop) is the 1.79-mile (2.88 km) long circuit of elevated rail that forms the hub of the Chicago "L" system in the United States. As of 2012, the branch has served 74,651 passengers every weekday.[2] The Loop is so named because the elevated tracks loop around a rectangle formed by Lake Street (north side), Wabash Avenue (east), Van Buren Street (south), and Wells Street (west). The railway loop has given its name to Chicago's downtown, which is also known as the Loop.

Transit began to appear in Chicago in the latter half of the 19th century as the city grew rapidly, and rapid transit started to be built in the late 1880s. When the first rapid transit lines opened in the 1890s, they were independently owned and each had terminals that were located immediately outside of Chicago's downtown, where it was considered too expensive and politically inexpedient to build rapid transit. Charles Tyson Yerkes aggregated the competing rapid transit lines and built a loop connecting them, which was constructed and opened in piecemeal fashion between 1895 and 1897, finally completing its last connection in 1900. Upon its completion ridership on the Loop was incredibly high, such that the lines that had closed their terminals outside of downtown had to reopen them to accommodate the surplus rush-hour traffic.

In the latter half of the 20th century, ridership declined and the Loop was threatened with demolition in the 1970s. However, interest in historic preservation occurred in the 1980s, and ridership has stabilized since.


Chicago Transit Authority signal tower 18 controls traffic of Purple and Brown Line trains entering from and exiting to the north, Pink and Green Line trains entering and exiting to the west, and Orange Line trains remaining in the Loop above the Wells and Lake street intersection.
A Brown Line train departing from Madison/Wabash
Northward view from the Adams/Wabash station at night
Loop Elevated, with CNA Center and Old Colony Building
An Orange Line train approaches Quincy on the Wells Street portion of the Loop in 2008.
A street level view of the elevated trains

The Loop includes eight stations: Clark/Lake and State/Lake are on the northern leg; Washington/Wabash and Adams/Wabash are on the eastern side; Harold Washington Library – State/Van Buren 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.

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.[3] The current Tower 18 was placed into service on May 19, 2010, replacing the former tower on that site that was built in 1969.[3]

Five of the eight 'L' lines use the Loop tracks:

In the CTA system, the entire loop taken as a whole is considered the termination point of a line, just like a single station or stop is considered the termination point when outside the downtown loop.

Both of the 'L' lines with 24 hour service, the Blue Line and the Red Line, run in subways through the center of the Loop, and have both in-system and out-of-system transfers to Loop stations. The Yellow Line is the only 'L' line that does not run on or connect to the Loop.


History of transit in Chicago

When it was incorporated as a city in 1837, Chicago was dense and walkable, so there was no need for a transit system. Things began to change as Chicago grew rapidly in the 19th century.

Rapid transit and the "L"

Prior to construction of the Union Loop, Chicago's three elevated railway lines—the South Side Elevated Railroad, the Lake Street Elevated Railroad, and the Metropolitan West Side Elevated Railroad—each had their own terminal on the edges of downtown Chicago. Charles Tyson Yerkes masterminded the linking of these railroads.[4]

Construction of the Loop

The Union Elevated Railroad Company was incorporated November 1894 for the purpose of constructing a loop in the heart of the city's business district.[5] With tense opposition from owners of abutting properties, extensive litigation ensued during the course of receiving approval to build the loop.[5] Between January 8, 1894 and June 29, 1896 a series of ordinances were passed by the Chicago City Council enabling the construction of the Union Loop's route.[5]

The Union Loop was constructed in separate sections: the Lake Street 'L' was extended along the north side in 1895; the Union Elevated Railroad opened the east side along Wabash Avenue in 1896 and the west side along Wells Street in 1897; and the Union Consolidated Elevated Railroad opened the south side along Van Buren Street in 1897.

The Loop opened on September 6, 1897.[6]

The Loop was born in political scandal: upon completion, all the rail lines running downtown had to pay Yerkes's operation a fee, which raised fares for commuters; when Yerkes, after bribery of the state legislature, secured legislation by which he claimed a fifty-year franchise, the resulting furor drove him out of town and ushered in a short-lived era of "Progressive Reform" in Chicago.[7]

Originally there were 12 stations, with three stations on each side. The construction of the west-leg of the Union Loop over Wells Street required the removal of the southern platform of the Fifth/Lake station. The addition of the Northwestern Elevated Railroad caused the removal of the rest of the station as the remaining platform sat across the new road's entry point.[8] This left 11 stations, two on the north leg of the loop and three on each other leg.

Station listing

Chicago Transit Authority Chicago 'L' route map

This lists each station beginning at the northwest corner and moving counterclockwise around the loop: south along Wells Street, east along Van Buren Street, north along Wabash Avenue, and west along Lake Street.

Station Location Points of interest & Notes
Randolph/Wells 150 N. Wells St. Closed July 17, 1995; partially demolished and replaced by Washington/Wells
Washington/Wells Disabled access
100 N. Wells Street Chicago City Hall, Civic Opera House, Chicago Mercantile Exchange

Transfer for Metra trains via Ogilvie Transportation Center

Madison/Wells 1 N. Wells St. Closed January 30, 1994; demolished and replaced by Washington/Wells
Quincy Disabled access
220 S. Wells Street Willis Tower (formerly the Sears Tower)

Transfer for Metra and Amtrak trains via Union Station

LaSalle/Van Buren
121 W. Van Buren Street Chicago Board of Trade, Chicago Board Options Exchange, Metropolitan Correctional Center

Transfer for Metra trains via LaSalle Street Station

Dearborn/Van Buren Dearborn Street and Van Buren Street Closed 1949, replaced by Library-State/Van Buren on June 22, 1997.
Harold Washington Library – State/Van Buren Disabled access 1 W. Van Buren Street Harold Washington Library

Transfer station for Blue and Red Lines.

Adams/Wabash 201 S. Wabash Avenue Grant Park, Petrillo Music Shell, Buckingham Fountain, Art Institute of Chicago
Madison/Wabash 2 N. Wabash Avenue Closed March 16, 2015, demolished and replaced by Washington/Wabash.
Washington/​Wabash Disabled access 29 N. Wabash Avenue Consolidation of Madison/Wabash and Randolph/Wabash, opened August 31, 2017.
Randolph/Wabash 151 N. Wabash Avenue Closed September 3, 2017; demolished and replaced by Washington/Wabash.
State/Lake 200 N. State Street Chicago Theatre, Gene Siskel Film Center, Harold Washington College

Transfer station for Red Line

Clark/Lake Disabled access 100 W. Lake Street, Chicago James R. Thompson Center, Richard J. Daley Center

Transfer station for Blue Line

Fifth/Lake Wells Street and Lake Street Closed December 17, 1899

See also


  1. ^ "Annual Ridership Report" (PDF). Chicago Transit Authority. Retrieved May 22, 2017.
  2. ^ "2012 Annual Ridership Report" (PDF). Chicago Transit Authority. Archived from the original (PDF) on December 6, 2013. Retrieved January 2, 2014.
  3. ^ a b Garfield, Graham. "Tower 18". Retrieved June 12, 2010.
  4. ^ "Chicago - The Chicago rapid transit internet resource".
  5. ^ a b c "1897—Union Loop". Chicagology. Retrieved May 20, 2020.
  6. ^ Lindberg, Richard C. (2009). The Gambler King of Clark Street: Michael C. McDonald and the Rise of Chicago's Democratic Machine. SIU Press. pp. 101–102, 140–141. ISBN 978-0-8093-8654-3. Retrieved May 19, 2020.
  7. ^ Paul Barrett. "Chicago's Public Transportation Policy, 1900–1940s", 8 Ill. Hist. Teacher 25 (Illinois Historical preservation Agency, 2001).
  8. ^ "Chicago Stations - Fifth & Lake".

Coordinates: 41°52′48″N 87°38′47″W / 41.88000°N 87.64639°W / 41.88000; -87.64639