Kolkata Metro
E162700
Kolkata Metro is India’s oldest rapid transit system, serving as a major urban rail network for the city of Kolkata and its surrounding areas.
All labels observed (10)
How this entity was disambiguated
This entity first appeared as the object of triple T1418291 — 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: Kolkata Metro Context triple: [West Bengal, hasMetroSystem, Kolkata Metro]
-
A.
Mumbai Metro
Mumbai Metro is a rapid transit system serving the Mumbai metropolitan region, designed to alleviate congestion and complement the city’s suburban railway network.
-
B.
Delhi Metro
Delhi Metro is a rapid transit system serving Delhi and its surrounding metropolitan region, known for its extensive network, modern infrastructure, and role in easing urban congestion.
-
C.
Lucknow Metro
Lucknow Metro is a rapid transit system serving the city of Lucknow in Uttar Pradesh, India, designed to provide fast, modern urban transportation.
-
D.
Hyderabad Metro
Hyderabad Metro is a rapid transit system serving the city of Hyderabad, India, featuring multiple elevated corridors designed to ease urban traffic congestion and improve public transportation.
-
E.
Chennai Metro
Chennai Metro is a rapid transit system serving the Indian city of Chennai, providing urban rail connectivity across key residential, commercial, and industrial areas.
- 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: Kolkata Metro Target entity description: Kolkata Metro is India’s oldest rapid transit system, serving as a major urban rail network for the city of Kolkata and its surrounding areas.
-
A.
Mumbai Metro
Mumbai Metro is a rapid transit system serving the Mumbai metropolitan region, designed to alleviate congestion and complement the city’s suburban railway network.
-
B.
Delhi Metro
Delhi Metro is a rapid transit system serving Delhi and its surrounding metropolitan region, known for its extensive network, modern infrastructure, and role in easing urban congestion.
-
C.
Lucknow Metro
Lucknow Metro is a rapid transit system serving the city of Lucknow in Uttar Pradesh, India, designed to provide fast, modern urban transportation.
-
D.
Hyderabad Metro
Hyderabad Metro is a rapid transit system serving the city of Hyderabad, India, featuring multiple elevated corridors designed to ease urban traffic congestion and improve public transportation.
-
E.
Chennai Metro
Chennai Metro is a rapid transit system serving the Indian city of Chennai, providing urban rail connectivity across key residential, commercial, and industrial areas.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
metro system
ⓘ
public transport network ⓘ rapid transit system ⓘ |
| areaServed |
Kolkata metropolitan area
ⓘ
linked to:
Kolkata Metropolitan Area
|
| constructionStart | 1970s ⓘ |
| country | India ⓘ |
| electrification | 750 V DC third rail ⓘ |
| fareSystem | distance-based fare ⓘ |
| gauge | broad gauge ⓘ |
| hasDepot |
New Garia depot
ⓘ
Noapara depot ⓘ |
| hasLine |
East–West corridor
ⓘ
North–South corridor ⓘ
linked to:
North–South Corridor
|
| inception | 1984 ⓘ |
| lineColor |
East–West corridor – Green Line
ⓘ
North–South corridor – Blue Line ⓘ |
| locatedIn |
Kolkata
ⓘ
linked to:
Calcutta
West Bengal ⓘ |
| notableStation |
Dum Dum
ⓘ
Esplanade ⓘ Mahanayak Uttam Kumar ⓘ
linked to:
Uttam Kumar
Park Street ⓘ Rabindra Sadan ⓘ |
| numberOfLines | 2 ⓘ |
| openingDate | 1984-10-24 ⓘ |
| operator |
Metro Railway, Kolkata
ⓘ
linked to:
Kolkata Metro
|
| owner | Indian Railways ⓘ |
| peakRole | major commuter transport for Kolkata ⓘ |
| planningStart | 1970s ⓘ |
| primaryCityServed |
Kolkata
ⓘ
linked to:
Calcutta
|
| regulatoryBody |
Ministry of Railways, Government of India
ⓘ
linked to:
Ministry of Railways (India)
|
| rollingStockType | electric multiple unit ⓘ |
| safetyFeature |
automatic signalling
ⓘ
platform screen doors on some stations ⓘ |
| significance |
India’s first metro system
ⓘ
India’s oldest rapid transit system ⓘ |
| systemLength | over 30 km ⓘ |
| terminus |
Dakshineswar
ⓘ
linked to:
Dakshineswar Kali Temple
Kavi Subhash ⓘ Salt Lake Sector V ⓘ Sealdah ⓘ |
| ticketing |
paper ticket
ⓘ
smart card ⓘ |
| timeZone | Indian Standard Time ⓘ |
| trackConfiguration |
at-grade
ⓘ
elevated ⓘ underground ⓘ |
| website | https://mtp.indianrailways.gov.in/ ⓘ |
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: Kolkata Metro Description of subject: Kolkata Metro is India’s oldest rapid transit system, serving as a major urban rail network for the city of Kolkata and its surrounding areas.
Referenced by (16)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Kolkata Metro
linked to: Kolkata Metro
linked to: Kolkata Metro
linked to: Kolkata Metro
linked to: Kolkata Metro
linked to: Kolkata Metro
linked to: Kolkata Metro
subject linked to:
New Town
linked to: Kolkata Metro
linked to: Kolkata Metro