Dearborn Subway (Blue Line)
E868096
Dearborn Subway (Blue Line) is the underground segment of Chicago’s Blue Line that runs through downtown via Dearborn Street, connecting key Loop stations and facilitating rapid transit across the city’s core.
All labels observed (5)
| Label | Occurrences |
|---|---|
| Milwaukee–Dearborn subway | 2 |
| Dearborn Subway (Blue Line) canonical | 1 |
| Milwaukee-Dearborn subway | 1 |
| Milwaukee–Dearborn Subway | 1 |
| Milwaukee–Dearborn subway / O'Hare branch corridor | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10511185 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Dearborn Subway (Blue Line) Context triple: [Clark/Lake station (CTA), hasSubwaySection, Dearborn Subway (Blue Line)]
-
A.
Monroe (Red Line)
Monroe (Red Line) is a Chicago 'L' rapid transit station in the Loop located in the median of State Street and served by the Red Line.
-
B.
Metra Electric District line
The Metra Electric District line is a commuter rail line in the Chicago metropolitan area that runs from downtown Chicago to its southern suburbs, serving key destinations along the South Side and beyond.
-
C.
Sixth Avenue Line
The Sixth Avenue Line is a major New York City Subway trunk line in Manhattan that primarily carries B, D, F, and M trains along Sixth Avenue.
-
D.
Purple Line (CTA)
The Purple Line (CTA) is a rapid transit route in Chicago primarily serving the northern suburbs and Evanston, with express service to downtown during weekday rush hours.
-
E.
Fourth Avenue Line
The Fourth Avenue Line is a major New York City Subway trunk line in Brooklyn that carries several services, including the N train, along a north–south corridor.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Dearborn Subway (Blue Line) Target entity description: Dearborn Subway (Blue Line) is the underground segment of Chicago’s Blue Line that runs through downtown via Dearborn Street, connecting key Loop stations and facilitating rapid transit across the city’s core.
-
A.
Monroe (Red Line)
Monroe (Red Line) is a Chicago 'L' rapid transit station in the Loop located in the median of State Street and served by the Red Line.
-
B.
Metra Electric District line
The Metra Electric District line is a commuter rail line in the Chicago metropolitan area that runs from downtown Chicago to its southern suburbs, serving key destinations along the South Side and beyond.
-
C.
Sixth Avenue Line
The Sixth Avenue Line is a major New York City Subway trunk line in Manhattan that primarily carries B, D, F, and M trains along Sixth Avenue.
-
D.
Purple Line (CTA)
The Purple Line (CTA) is a rapid transit route in Chicago primarily serving the northern suburbs and Evanston, with express service to downtown during weekday rush hours.
-
E.
Fourth Avenue Line
The Fourth Avenue Line is a major New York City Subway trunk line in Brooklyn that carries several services, including the N train, along a north–south corridor.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
rapid transit subway segment
ⓘ
underground rail line ⓘ |
| connects |
Forest Park branch of the Blue Line
ⓘ
Loop stations ⓘ Northwest Side of Chicago ⓘ O'Hare branch of the Blue Line ⓘ West Side of Chicago ⓘ
linked to:
West Side, Chicago
|
| connectsTo |
Metra commuter rail via nearby downtown stations
ⓘ
numerous CTA bus routes in the Loop ⓘ |
| connectsWith |
Loop elevated lines via transfer stations
ⓘ
Red Line via pedestrian transfer at Jackson–State/Lake–Dearborn complex ⓘ |
| electrification | third rail ⓘ |
| fareCollection | automated turnstiles ⓘ |
| fareMediumAccepted |
Ventra card
ⓘ
linked to:
Ventra
contactless bank cards ⓘ mobile tickets ⓘ |
| fareSystem | CTA fare system ⓘ |
| hasRightOfWay | exclusive ⓘ |
| hasRole | core downtown trunk for Blue Line ⓘ |
| hasStation |
Clark/Lake station
ⓘ
Jackson station (Blue Line) ⓘ LaSalle station (Blue Line) ⓘ Monroe station (Blue Line) ⓘ Washington station (Blue Line) ⓘ
linked to:
Washington station (CTA Blue Line)
|
| infrastructureType | tunnel ⓘ |
| isGradeSeparated | true ⓘ |
| isUnderground | true ⓘ |
| lineColor | Blue ⓘ |
| locatedIn |
Chicago, Illinois
ⓘ
linked to:
Chicago, Illinois, United States
United States ⓘ
linked to:
United States of America
|
| openedAsPartOf | Chicago subway system expansion ⓘ |
| operatedBy | Chicago Transit Authority ⓘ |
| ownedBy | Chicago Transit Authority ⓘ |
| partOf |
Chicago Transit Authority Blue Line
ⓘ
linked to:
CTA Blue Line
|
| primaryFunction | facilitate rapid transit across Chicago’s central business district ⓘ |
| runsUnder | Dearborn Street ⓘ |
| safetyFeatures |
emergency exits
ⓘ
lighting systems ⓘ ventilation systems ⓘ |
| serves |
commuters
ⓘ
tourists ⓘ |
| servesArea | Chicago Loop ⓘ |
| serviceType | rapid transit ⓘ |
| system | Chicago "L" ⓘ |
| trackGauge | standard gauge ⓘ |
| usedBy | Blue Line trains ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Dearborn Subway (Blue Line) Description of subject: Dearborn Subway (Blue Line) is the underground segment of Chicago’s Blue Line that runs through downtown via Dearborn Street, connecting key Loop stations and facilitating rapid transit across the city’s core.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Dearborn Subway (Blue Line)
linked to: Dearborn Subway (Blue Line)
linked to: Dearborn Subway (Blue Line)