Blue Line
E356234
The Blue Line is one of the main corridors of the Chennai Metro rapid transit system, connecting key areas of Chennai, India.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Blue Line canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3258259 — 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: Blue Line Context triple: [Chennai Metro, line, Blue Line]
-
A.
Blue Line
The Blue Line is a major rapid transit route in Chicago that runs between O'Hare International Airport and the city's western suburbs via downtown.
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B.
Blue Line
The Blue Line is one of the color-coded rapid transit routes in the Washington Metro system, running through key parts of Washington, D.C. and its Virginia suburbs.
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C.
Blue Line
The Blue Line is one of Boston's MBTA rapid transit routes, running primarily between downtown Boston and the coastal communities of East Boston and Revere.
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D.
Blue Line
The Blue Line is one of the main lines of the Lisbon Metro system, serving key central and northern areas of Portugal’s capital city.
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E.
Blue Line
The Blue Line is a light rail route in the Dallas Area Rapid Transit (DART) system serving key neighborhoods and suburbs in the Dallas–Fort Worth metroplex.
- 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: Blue Line Target entity description: The Blue Line is one of the main corridors of the Chennai Metro rapid transit system, connecting key areas of Chennai, India.
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A.
Blue Line
The Blue Line is one of the major corridors of the Delhi Metro rapid transit system, connecting key residential and commercial areas across Delhi and its neighboring regions.
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B.
Blue Line
The Blue Line is a planned rapid transit corridor of Bengaluru’s Namma Metro network intended to expand connectivity across additional parts of the city.
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C.
Blue Line
The Blue Line is one of the main lines of the Lisbon Metro system, serving key central and northern areas of Portugal’s capital city.
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D.
Blue Line
Blue Line is a light rail line in the Los Angeles Metro Rail system that connects downtown Los Angeles with Long Beach and was the system’s inaugural route.
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E.
Blue Line
The Blue Line is one of the primary routes of the MetroLink light rail system serving the St. Louis metropolitan area.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
metro line
ⓘ
rapid transit line ⓘ |
| color | blue ⓘ |
| connects | key areas of Chennai ⓘ |
| country | India ⓘ |
| electrification | overhead catenary ⓘ |
| fareSystem | Chennai Metro fare system ⓘ |
| hasFeature |
CCTV surveillance
ⓘ
air-conditioned trains ⓘ automatic fare collection system ⓘ disabled-friendly access at stations ⓘ escalators and elevators at stations ⓘ |
| hasRollingStock | electric multiple units ⓘ |
| hasSystem | platform screen doors (at some stations) ⓘ |
| isMainCorridorOf | Chennai Metro ⓘ |
| locatedIn |
Chennai
ⓘ
India ⓘ Tamil Nadu ⓘ |
| operator |
Chennai Metro Rail Limited
ⓘ
linked to:
Chennai Metro
|
| owner |
Chennai Metro Rail Limited
ⓘ
linked to:
Chennai Metro
|
| partOf | Chennai Metro ⓘ |
| publicTransportMode | metro ⓘ |
| railGauge | standard gauge ⓘ |
| safetySystem |
automatic train control
ⓘ
automatic train protection ⓘ |
| servesCity | Chennai ⓘ |
| ticketing |
paper ticket
ⓘ
smart card ⓘ |
| transitType | rapid transit ⓘ |
| transportSystem | Chennai Metro ⓘ |
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: Blue Line Description of subject: The Blue Line is one of the main corridors of the Chennai Metro rapid transit system, connecting key areas of Chennai, India.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.