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Blue Line
A Blue Line train of7000-series cars leavingUIC–Halsted station on the Congress branch
Overview
Status	Operating
Owner	Chicago Transit Authority
Locale	Chicago,Oak Park,Forest Park andRosemont,Illinois
Termini	O'Hare Forest Park
Stations	33
Service
Type	Rapid transit
System	Chicago "L"
Services	O'Hare–Forest Park
Operator(s)	Chicago Transit Authority
Depot(s)	Desplaines Yard,Rosemont Yard
Rolling stock	Mixed2600-series and3200-series,7000-series 8 car trains (typical, maximum)
Daily ridership	72,475 (avg. weekday 2023)
History
Opened	Oldest segment: May 6, 1895; 129 years ago (1895-05-06) Current operation: June 22, 1958; 66 years ago (1958-06-22)
Technical
Line length	26.93 mi (43.3 km)
Character	Expressway, Subway andElevated
Track gauge	4 ft 8+1⁄2 in (1,435 mm)standard gauge
Electrification	Third rail, 600 V DC
Route map Show interactive map Legend O'Hare I-190 ATS NCS toUnion Station toAntioch Chicago Rosemont Rosemont Des Plaines River Rosemont Chicago I-90 Cumberland Harlem UPNWto Harvard or McHenry Jefferson Park MDNtoFox Lake I-94 MDNtoUnion Station Montrose Irving Park |Irving Park Addison UPNWtoOgilvie Belmont Logan Square Relocated 1970 California Western Damen Division Chicago Grand Chicago River RedtoHoward Clark/Lake■■■■■ ■Lake Washington |■ Washington closed 2006 Monroe |■Monroe Jackson |■Jackson ■■■■Library Redto95th/​Dan Ryan LaSalle │LaSalle Street RItoJoliet Chicago River Clinton I-290 UIC–Halsted Racine Service now provided byPink Line Pinkto theLoop Polk BNSFtoUnion Station 18th Damen Western California BNSFtoAurora Kedzie Central Park Pulaski Kostner Cicero 50th closed 1978 Laramie closed 2003 54th/​Cermak Illinois Medical District Western California closed 1973 Kedzie–Homan Pulaski Kostner closed 1973 Cicero Central closed 1973 Chicago Oak Park Austin Oak Park Oak Park Forest Park Harlem Forest Park   Direct connection outside ofpaid area This diagram: view talk edit Show route diagram map

TheBlue Line is a 26.93-mile-long (43.34 km)Chicago "L" line which runs fromO'Hare International Airport at the far northwest end of the city, through downtown via theMilwaukee–Dearborn subway and across theWest Side to its southwest end inForest Park, with a total of 33 stations (11 on the Forest Park branch, 9 in the Milwaukee–Dearborn subway and 13 on the O'Hare branch). 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.^[1]

Chicago's Blue Line andRed Line offer 24-hour service, every day, year-round. This makes Chicago, New York City, and Copenhagen the only three cities in the world to offer local nonstop rail service throughout their city limits 24 hours a day, seven days a week. The Blue Line is one of two lines in Chicago with more than one station having the same name, with theGreen Line being the other. (The Blue Line has two stations at Harlem Avenue: one in the Kennedy Expressway on the Northwest side and one on the Eisenhower Expressway inForest Park, Illinois. It also has two stations on Western Avenue: one on the segment between downtown and O'Hare, and one immediately west of downtown.) The Blue Line also has two in-system transfers (both in the Loop), and does not share tracks with any other 'L' line.

Before the adoption of color-coded names, the Blue Line was referred to as theWest-Northwest Route, or more commonly, theO'Hare-Congress-Douglas route for its three branches. The Congress and Douglas branches were renamed for their terminals,Forest Park and54th/Cermak, when the current color naming system was adopted in 1993. Blue Line service on the Douglas segment was replaced in April 2008 by thePink Line.^[2]

The Blue Line is one of five "L" lines that run into Chicago suburbs, with the others being the Green,Purple, Pink, andYellow lines. The Blue Line runs in three suburbs: Rosemont, Oak Park, and Forest Park.

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The Blue Line terminal atO'Hare International Airport

Clark/Lake station on the Milwaukee–Dearborn subway

The Blue Line tracks in the median of theEisenhower Expressway

TheO'Hare branch is the longest section of the Blue Line (14.6 miles (23.5 km)) and comprises both the oldest and newest segments of the entire route. The line starts atO'Hare International Airport inan underground station below the airport's main parking garage, with direct pedestrian access to Terminals 1, 2 and 3. The line emerges in the median of the O'Hare main access road (Interstate 190) just northwest of Terminal 5, about a mile (1.6 km) west of Mannheim Road.

The line runs in the median ofInterstate 190 east throughRosemont. The line has a station at River Road inRosemont, which is also the location of the northern storage yard and served as a temporary terminal from 1983 to 1984 while the O'Hare station was being completed. The tracks then tunnel beneath theKennedy Expressway/Northwest Tollway interchange near theDes Plaines River.

The line runs in the median of the Kennedy Expressway (Interstate 90) until a point southeast of Addison Street, making stops atCumberland,Harlem,Jefferson Park,Montrose,Irving Park andAddison. Between Montrose and Irving Park, the line tunnels beneath an express lane exit. South of Addison Street, the line descends into a subway and turns south under Kimball Avenue. The line travels under Kimball Avenue andMilwaukee Avenues throughLogan Square, making stops atBelmont andLogan Square.

South of Logan Square, the line emerges above ground onto an elevated structure parallel to Milwaukee Avenue. This section of structure, built in 1895 as part of the Metropolitan Elevated'sLogan Square branch, is the oldest portion of the Blue Line, and the sole section of the line on an elevated viaduct. The three stations on this section (California,Western, andDamen) are also the only three stations on the line to use side platforms instead of island platforms.

At the intersection of Ashland and Milwaukee Avenues, the Blue Line descends underground, swings over to Milwaukee Avenue, and continues southeast towards downtown under Milwaukee Avenue (with stops atDivision,Chicago andGrand). The line then turns east under Lake Street, crossing beneath theChicago River, and makes a stop atClark/Lake, where in-system transfers are provided to 'L' trains on the Loop.

East of Clark/Lake, the tracks swing south under Dearborn Street, with a continuous platform similar to the continuous platform used in the adjacentState Street subway, with stops atWashington,Monroe, andJackson.

South of Jackson, the line turns west underIda B. Wells Drive (with stops atLaSalle andClinton, which is two blocks south ofUnion Station). The tracks then emerge from a portal nearUIC-Halsted in the median of theEisenhower Expressway (Interstate 290) and continue west.

Congress branch
Legend
Milwaukee-Dearborn subway I-290 Eisenhower Expressway I-90 /I-94 UIC–Halsted Racine ←Paulina Connector Douglas branch → Illinois Medical District Western California Kedzie–Homan Pulaski Kostner Belt Railway of Chicago Cicero Baltimore & Ohio Chicago Terminal RR Central Chicago Oak Park Austin Oak Park Oak Park Forest Park Harlem Baltimore & Ohio Chicago Terminal RR Forest Park Desplaines Yard Des Plaines River Illinois Prairie Path
This diagram: view talk edit

After exiting the subway, the tracks continue west in the median of the Eisenhower Expressway as theForest Park branch, formerly called theCongress branch, successor to the Garfield Park Branch.

Immediately west ofRacine, the Forest Park branch tracks diverge to permit a ramp up to the Cermak Branch elevated structure. This ramp was formerly used in revenue service from 1958 to 2008 when the Blue Line operated over the Cermak branch and the Forest Park branch.

With the replacement of Cermak branch Blue Line service with the Pink Line, the ramp is nownon-revenue trackage used for the transfer of 5000 series trains that the Blue Line borrows from the Pink Line for weekday rush hour service. The Forest Park branch remains in the median of the expressway through the west side of Chicago until it reaches a portal at Lotus Avenue.

At this point, the tracks pass beneath the eastbound expressway lanes before emerging on the south side of the expressway next to theCSX Transportation (Baltimore and Ohio Chicago Terminal Railroad) tracks. The route passes throughOak Park and intoForest Park. In the vicinity of Desplaines Avenue the tracks rise and make an S-curve north over the expressway before terminating at theForest Park station.

Like theRed Line, the Blue Line runs 24 hours a day. Most trains run between O'Hare and Forest Park stations, but others terminate at a different station along the line. On weekdays, service runs very frequently (10–20 tph (trains per hour)) during rush hour (with some trains running short-turn services between UIC-Halsted and Jefferson Park or Rosemont), and 6–8 tph during the midday and nighttime.^[3]

On Saturdays, service runs 8 tph in the early morning, then increase to 10 tph during the day, then 8 tph at night. On Sundays, service runs 6–8 tph early morning, then increase to 10 tph all day, then 6 tph at night. On the weekends, every other Blue Line train operates between O'Hare and UIC-Halsted only during the daytime, doubling the headways up to 5 tph. Between approximately midnight and 5:30 a.m.,night owl service on the Blue Line ranges between 3–4 tph.^[3]

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The Blue Line is operated with the2600-series,3200-series, and7000-series railcars. In 2018, some of the 2600-series cars from the Blue Line fleet were replaced with the recently rehabbed3200-series cars from theBrown andOrange Lines, with some of the 2600-series cars being reassigned to the Orange Line to replace them. These cars entered service on the Blue Line on September 17, 2018. In addition to the mix of the 2600-series and 3200-series cars, two 5000-series trainsets assigned to thePink Line make trips on the Blue Line during weekday rush hours, although these cars remain officially assigned to the Pink Line and are operated by Pink Line operators.

The Metropolitan's trackage (dark blue) connected withthe Loop (black), compared with the modern-day Blue Line (light blue)

The Blue Line is the successor to theMetropolitan West Side Elevated Railroad, which built a series of 'L' lines servicing the West Side of Chicago beginning in 1895. The first section to be built by the Metropolitan extended west in the vicinity of Van Buren Street from an independent terminal at Canal and Jackson Streets to Marshfield Avenue, and then northward in the vicinity of Paulina Street to Damen and Milwaukee Avenues. Service on this section began on May 6, 1895.^[4] The structure was completed from Damen Avenue to Logan Square on May 25, 1895.^[5]

The next stage in the development of the West Side 'L' came on June 19, 1895, when theGarfield Park Branch was added, extending west in the vicinity of Van Buren Street and Harrison Street from Marshfield Avenue to Cicero Avenue.^[6] An extension of service over the tracks of theAurora, Elgin and Chicago Railroad toa new terminal at Desplaines Avenue was established on March 11, 1905. A subsequent extension toWestchester opened on October 1, 1926, over tracks that had originally been built by the CA&E with the intentions of building a bypass route.^[7] (Low ridership would prompt the CTA to discontinue service on theWestchester extension on December 9, 1951.^[7])

Another branch line was added to the rapidly growing Metropolitan on July 29, 1895, when trains began operating over theHumboldt Park Branch, splitting off from the Logan Square Branch atDamen and running west alongside North Avenue to a terminal at Lawndale Avenue.^[8] This was followed by still another addition when the Douglas Park Branch was placed in operation as far south as 18th Street on April 28, 1896.^[9]

As the southwest area of the city developed, the Douglas Park Branch was extended from 18th Street to Western Avenue in September 1896; to Pulaski Road in June 1902; to Cicero Avenue in December 1907; to Central Avenue in August 1912; to 62nd Avenue in August 1915, and to Oak Park Avenue inBerwyn on March 16, 1924. The Douglas Park branch was later cut back to 54th Avenue inCicero.

The Metropolitan West Side Elevated began service onto the Loop on October 11, 1897,^[10] and a rush periodstub terminal at Wells Street was added October 3, 1904. For much of the early 20th century and through the 1940s, service on the West Side Elevated lines went unchanged until 1947, when theChicago Transit Authority took control of the 'L', initiating a series of massive service cuts and station closings (that would last until the 1980s).^{[citation needed]}

The Metropolitan lines began to be reshaped into the current Blue Line on February 25, 1951, when the CTA opened the Milwaukee-Dearborn Subway, connecting the Logan Square Branch with the Loop on a fast, efficient and more direct routing to downtown, rather than the previous circuitous route that saw these trains entering the Loop at the southwest corner.^[11] With opening of the Dearborn Subway, the old elevated alignment between Evergreen Portal and Marshfield Junction was decommissioned, used only for moving out-of-service rail cars. The northern section of the connection between Evergreen Avenue and Lake Street was demolished in the 1960s, leaving the Lake Street to Douglas Branch section—better known as the Paulina Connector—the only section still in operation. The Humboldt Park Branch was cut back to a full-time shuttle between Damen and Lawndale, and discontinued a year later on May 3, 1952.

The Garfield Park elevated was replaced by the Congress line on June 22, 1958,^[12] pioneering the world's first use of rail rapid transit and a multi-lane automobile expressway in the same grade-separated right-of-way.^[13] (Pacific Electric Railway "Red Car" tracks ran in the median of the Cahuenga Parkway inLos Angeles from 1944 until its expansion into theHollywood Freeway in 1952, but the Pacific Electric service was aninterurban streetcar rather than true rapid transit.) The new line connected with the Milwaukee-Dearborn Subway at theChicago River and extended westward to Des Plaines Avenue in Forest Park. Loomis Ramp, built at this same time, permitted Douglas trains to be rerouted through the subway as well combining the Logan Square, Garfield Park (now Congress) and Douglas routes into the second through service in Chicago, the Congress/Douglas-Milwaukee Line.^[14]

A five-mile (8 km) extension of the route via a short subway connection and theKennedy Expressway median fromLogan Square toJeffersonPark opened on February 1, 1970. It was also built by the City of Chicago using federal money. Just before Logan Square, trains diverted off of the old elevated structure and entered the subway under Milwaukee and Kedzie Avenues to a portal just south of Addison Street, then emerged in the median of the Kennedy Expressway to the temporary terminal at Jefferson Park. The increased ridership that resulted from the extension prompted the CTA to build the second phase of the project, and extend the line the rest of the way to O'Hare. In March 1980, construction began on the O'Hare Airport extension, with the first section between Jefferson Park and River Road opening on February 27, 1983,^[15] and the final section to O'Hare on September 3, 1984.^[16]

On February 21, 1993, the CTA adopted a color-coded naming system to the rapid transit system, and the West-Northwest route (O'Hare-Congress/Douglas) became the Blue Line.

On October 15, 2015, the CTA announced the completed installation of4G wireless service on the Blue Line in between theLogan Square andBelmont stations. In the future this will mean that the CTA will be the largest rapid transit system with 4G coverage in subway tunnels and stations, this is targeted for the end of 2015.^[17]

TheCermak branch, formerly known as the Douglas branch, was once operated as part of the Blue Line. On April 28, 2008, the CTA eliminated Blue Line service on the Cermak branch, having been replaced by thePink Line.^[18] The Loomis ramp that connects the Congress branch to the Cermak branch remains intact for non-revenue equipment moves as the only track connection between the Blue Line and the rest of the system.

On April 26, 1998, the Douglas Branch lost its overnight (owl) and weekend service and began operating between 4 a.m. and 1 a.m. on weekdays only as a result of budget cuts that also eliminated owl service on several other lines. Congress (Forest Park) service was effectively doubled through much of the day since service frequency from O'Hare required shorter headways than what would have been left.

While the CTA claimed Douglas branch reductions were due to low ridership, community activists also pointed to badly deteriorated infrastructure and funding shortfalls, as well as a perception that the CTA was uninterested in serving the West Side. On September 10, 2001, the CTA began a historic reconstruction of the Douglas Branch to repair its aging stations and tracks.^[19] The work was officially completed on January 8, 2005, with new elevated structures, tracks, rebuilt stations, new communication networks and an upgraded power system along the route.^[20] On January 1, 2005, weekend service was restored.

In January 2005, the CTA held hearings on a proposal to reroute Douglas Branch service via the recently rebuilt Paulina Connector to the Lake StreetGreen Line, carrying Douglas trains to and around the elevated Loop for the first time since 1958. It was the first stage of what became thePink Line. This would have allowed a doubling of Blue Line trains to Forest Park on the Congress Branch, since service would no longer be divided between the Forest Park and 54th/Cermak terminals. Due to community fears that the Pink Line would not be enough, however, the CTA decided to retain limited Douglas Branch Blue Line service during weekday rush hours.

On February 15, 2006, the CTA approved the separate operation of the Douglas Branch plan.^[21] All non-rush hour trains would all be routed via the Loop,Green Line and Paulina Connector. During rush hour, service was available on the new route as well as the existing route via the Milwaukee-Dearborn Subway. These changes were scheduled to be implemented for a 180-day trial period beginning June 25, 2006, and after their evaluation in early 2007, the Pink Line remained in service.

Beginning April 28, 2008, the CTA began a six-month experimental ceasing of Blue Line operations on the Douglas.^[18] Despite maintaining that the service cut was an experiment, the CTA immediately covered Blue Line stations' directional signage for trains to54th/​Cermak with paint rather than temporary covering, suggesting it was a permanent discontinuation instead of a temporary one. All Douglas Branch operations are now served by the Pink Line.^[22] On December 4, 2008, CTA announced its decision to permanently discontinue Blue Line service on the Douglas branch and to make the Pink Line permanent.^[23]

• On July 11, 2006, a derailment caused a smoky fire in the Blue Line's Milwaukee-Dearborn Subway. There were injuries fromsmoke inhalation, but no fatalities. The comparatively minor incident prompted heavy news coverage and a temporary stoppage of Chicago subway service because it occurred hours aftertrain bombings in Mumbai earlier the same day.^[24]
• On September 30, 2013, two Blue Line trains collided atHarlem (Congress branch), injuring 33 people, after an outbound train was hit by an out-of-service train going the opposite direction on the same track. Earlier, the train had arrived at Forest Park, and went out of service. However, after the train pulled into the Desplaines Yard, it was left on. There were no passengers on the out-of-service train; the number of workers on it at the time of the crash was also an unknown. Also unknown was the total number of passengers on the outbound, in-service train. The investigation started shortly thereafter. Though service soon went back to normal, trains did not stop at the Harlem station until the late evening on Tuesday, October 1, 2013, to avoid interference with the scene and congestion.^[25][26] TheNTSB concluded that the probable cause was water in the control cables and insufficient securing of unattended equipment.^[27]
• In the early morning hours of March 24, 2014, a Blue Line trainderailed at O'Hare at the end of its run. Initial reports said that 32 passengers on the train were injured, but none of the injuries were considered life-threatening.^[28] The station reopened on Sunday, March 30, 2014, at 2:00 p.m.^[29]
• On April 10, 2019, a Blue Line train derailed in the tunnel nearO'Hare station.^[30][31]
• On September 2, 2024, four people were killed ina mass shooting on a Blue Line train as it traveled between theOak Park andHarlem stations. The gunman was arrested after boarding thePink Line.^[18][32]

For years, there has been discussions of extending theO'Hare terminus of the Blue Line westward toSchaumburg, but that has been changed, due to recent developments involving the planning of theMetra STAR Line and various other transportation projects^[33].

However, in 2008, theRegional Transit Authority revealed a plan to the RTA board to expand commuter rail and bus service, which included a 13.3-mile (21.4 km) extension of the Blue Line, from its current western terminus at Forest Park toYorktown Center inLombard, Illinois. Several feeder bus services would also be implemented in this plan. The prospect of this extension was also listed in the Chicago region's 2030 master plan.^[34]

In 2013, the idea of an infill station at Nagle and Bryn Mawr Avenues was postponed. Such a station remains only idea but may come to fruition in the future because that particular stretch of the line, between Jefferson Park and Harlem, is the second longest on the 'L' system without a station, behind the gap on theYellow Line betweenOakton-Skokie andHoward, although the Yellow Line was designed this way to quickly shuttle passengers to/from the Howard station (the Howard station serves the Red and Purple Lines).^[35]

In December 2016, Pace introduced the on-highway BRTI-90 Express service. The successor to the Blue Line Extension and the STAR Line, this service serves as an extension of the Blue Line and provides rapid service along I-90 all the way to Elgin.

The surface right-of-way for the Congress Branch, including overcrossings, undergrade bridges and two short tunnels under the expressway, contains space for one extra track between Forest Park and Kenton Avenue and two extra tracks from Kenton to the tunnel portals at UIC-Halsted. It was intended that the interurban Chicago Aurora and Elgin Railroad, which had utilized the Garfield Park Elevated until 1953 to reach its Loop terminal at Wells Street, would use these extra tracks. However, the CA&E ceased passenger service on July 3, 1957, before track construction had started.^[36] The CTA also considered plans of its own to add these as express tracks (and service) over the years, as well as a rerouting of theLake Elevated onto the Paulina Elevated (today'sPink Line) into a new quadrant of the junction with the Douglas Line at Racine, but these plans were discarded for alternative plans and today the system has an entirely separate line in the system, the Pink Line.^[37]

The dual portals of the Congress Branch at UIC-Halsted are actually quadruple. Two extra portals exist to the north of the Blue Line portals, which extend only a few dozen feet beyond the portals. These were intended to accommodate future expansion, including a new CA&E line to a new terminal.^[37] Among those plans were a loop subway system via Congress, Dearborn, Lake, and Clinton when the Milwaukee-Dearborn-Congress Subway was completed between 1951 and 1958, and a shuttle subway route under Jackson Street to Grant Park (1958, "New Horizons for Chicago Metropolitan Area",CTA).

Between 1968 and 1978, a plan in the form ofanother subway corridor in the Downtown area was proposed, which was to be routed from UIC-Halsted Station through the north portals, then north under Des Plaines Street to Monroe Street and east under Monroe Street toGrant Park andMillennium Park, where it was to split into two branches: one north to Walton Street serving the North Michigan Avenue area and the other southeast to McCormick Place utilizingMetra Electric right-of-way. Though these portals are still not used, the subway corridor plan under Monroe Street was never officially canceled when the Crosstown andLoop Subway projects were deferred in 1979. It remains to this day an active program.

Between Grand/Milwaukee and Clark/Lake in the Milwaukee-Dearborn Subway, two more stub tunnels exist, continuing west under Lake Street while the in-service tracks turn northwest under Milwaukee Avenue. This junction (actually a stacked junction), built in the 1940s along with the subway, was intended for a never-built connection to, or subway replacement of the Lake Street Elevated.^[38] In the late 1960s through the mid-1970s, they were also proposed to be a service link between the Dearborn Subway and a high-speed subway route in Randolph Street to replace a portion of the Lake Street 'L' east of Damen Avenue (Transit Planning Study Chicago Central Area, April 1968).

Municipality	Neighborhood	Station	Connections
Chicago	O'Hare	O'Hare	O'Hare International Airport ATSAirport Transit System
Rosemont		Rosemont
Chicago	O'Hare	Cumberland
	Norwood Park	Harlem
	Jefferson Park	Jefferson Park	Metra trains:■ Union Pacific Northwest Pace BRT:Pace Pulse
	Irving Park/Portage Park	Montrose	Metra trains:■ Milwaukee District North(atMayfair)
	Irving Park	Irving Park	Metra trains:■ Union Pacific Northwest(atIrving Park)
	Irving Park/Avondale	Addison
	Avondale/Logan Square	Belmont
	Logan Square	Logan Square
		California
		Western
	West Town	Damen
		Division
		Chicago
		Grand
	The Loop	Clark/Lake	CTA"L" trains:BrownGreenOrangePinkPurple
		Washington	CTA"L" trains:Red(atLake)
		Monroe
		Jackson	CTA"L" trains:Red(atJackson),BrownPinkPurpleOrange(atLibrary)
		LaSalle	Metra trains:■ Rock Island(atLaSalle Street)
	Near West Side	Clinton	Metra trains:■ BNSF,■ Heritage Corridor,■ Milwaukee District North,■ Milwaukee District West,■ North Central Service,■ SouthWest Service(atUnion Station) Amtrak long-distance:California Zephyr,Cardinal,City of New Orleans,Empire Builder,Floridian,Lake Shore Limited,Southwest Chief,Texas Eagle(atUnion Station) Amtrak intercity:Blue Water,Borealis,Hiawatha,Illini andSaluki,Illinois Zephyr andCarl Sandburg,Lincoln Service,Pere Marquette,Wolverine(atUnion Station)
		UIC–Halsted
		Racine
		Illinois Medical District
		Western
	East Garfield Park	California	Closed September 2, 1973
		Kedzie–Homan
	West Garfield Park	Pulaski
		Kostner	Closed September 2, 1973
	Austin	Cicero
		Central	Closed September 2, 1973
Oak Park		Austin
		Oak Park
Forest Park		Harlem
		Forest Park

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