South Side Main Line
E104300
The South Side Main Line is a key elevated rapid transit corridor on Chicago's 'L' system that carries multiple Green Line services through the city's South Side.
All labels observed (1)
| Label | Occurrences |
|---|---|
| South Side Main Line canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T797678 — 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: South Side Main Line Context triple: [Green Line (CTA), hasBranch, South Side Main Line]
-
A.
Frankford Avenue
Frankford Avenue is a major thoroughfare in Philadelphia, Pennsylvania, running through several neighborhoods as a key commercial and transit corridor.
-
B.
Dyre Avenue Line
The Dyre Avenue Line is a New York City Subway line in the Bronx operated by the IRT division, primarily serving the 5 train along a former New York, Westchester and Boston Railway right-of-way.
-
C.
Elmwood Avenue
Elmwood Avenue is a major street in Philadelphia, Pennsylvania, known for carrying a portion of SEPTA’s Subway–Surface trolley lines along its surface.
-
D.
Broad Street Line
The Broad Street Line is a major north–south rapid transit subway line in Philadelphia operated by SEPTA, running primarily beneath Broad Street and serving key downtown and neighborhood destinations.
-
E.
Penn Line
The Penn Line is a MARC commuter rail service in Maryland that runs along the busy Northeast Corridor between Washington, D.C., and Perryville, serving major intermediate stops such as Baltimore.
- 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: South Side Main Line Target entity description: The South Side Main Line is a key elevated rapid transit corridor on Chicago's 'L' system that carries multiple Green Line services through the city's South Side.
-
A.
Frankford Avenue
Frankford Avenue is a major thoroughfare in Philadelphia, Pennsylvania, running through several neighborhoods as a key commercial and transit corridor.
-
B.
Dyre Avenue Line
The Dyre Avenue Line is a New York City Subway line in the Bronx operated by the IRT division, primarily serving the 5 train along a former New York, Westchester and Boston Railway right-of-way.
-
C.
Elmwood Avenue
Elmwood Avenue is a major street in Philadelphia, Pennsylvania, known for carrying a portion of SEPTA’s Subway–Surface trolley lines along its surface.
-
D.
Broad Street Line
The Broad Street Line is a major north–south rapid transit subway line in Philadelphia operated by SEPTA, running primarily beneath Broad Street and serving key downtown and neighborhood destinations.
-
E.
Penn Line
The Penn Line is a MARC commuter rail service in Maryland that runs along the busy Northeast Corridor between Washington, D.C., and Perryville, serving major intermediate stops such as Baltimore.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
elevated railway
ⓘ
rapid transit line ⓘ |
| carriesService |
Green Line Ashland/63rd branch trains
ⓘ
Green Line Cottage Grove branch trains ⓘ |
| connectsTo |
Ashland/63rd Branch
ⓘ
surface form:
Ashland/63rd branch
Cottage Grove station ⓘ
surface form:
Cottage Grove branch
Loop elevated ⓘ
surface form:
Loop Elevated
|
| electrification | third rail ⓘ |
| fareCollection | proof-of-payment at station turnstiles ⓘ |
| fareSystem | Ventra ⓘ |
| hasColorDesignation | Green ⓘ |
| locatedIn |
Chicago, Illinois, United States
ⓘ
surface form:
Chicago, Illinois
South Side, Chicago ⓘ United States of America ⓘ
surface form:
United States
|
| mode | rail ⓘ |
| operator | Chicago Transit Authority ⓘ |
| owner | Chicago Transit Authority ⓘ |
| partOf | Chicago "L" ⓘ |
| platformType |
island platforms
ⓘ
side platforms ⓘ |
| safetySystem |
automatic block signaling
ⓘ
train stop system ⓘ |
| servesArea |
commercial corridors of Chicago South Side
ⓘ
residential neighborhoods of Chicago South Side ⓘ |
| serviceType | rapid transit ⓘ |
| structureType | elevated ⓘ |
| system | Chicago "L" Green Line ⓘ |
| trackGauge | standard gauge ⓘ |
| usesRollingStock |
CTA 3200-series railcars
ⓘ
CTA 5000-series railcars ⓘ |
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: South Side Main Line Description of subject: The South Side Main Line is a key elevated rapid transit corridor on Chicago's 'L' system that carries multiple Green Line services through the city's South Side.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Green Line (CTA)