M4
E629459
M4 is one of the lines of the Bucharest Metro rapid transit system, serving several northern and northwestern districts of Romania’s capital.
All labels observed (1)
| Label | Occurrences |
|---|---|
| M4 canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T6938199 — 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: M4 Context triple: [Bucharest Metro, hasLine, M4]
-
A.
M4
M4 is a boat line that operates as part of Geneva’s public transport network, providing passenger service across Lake Geneva.
-
B.
M4
M4 is a general-purpose macro processing language and preprocessor commonly used in Unix-like build systems and tools such as GNU Autoconf.
-
C.
M4
M4 is a major British motorway that runs between London and South Wales, serving as a key route for traffic to and from the west of England.
-
D.
M4
M4 is a driverless metro line in the Copenhagen Metro system that serves key waterfront and urban development areas of the city.
-
E.
M40
M40 is a major British motorway linking London with Birmingham and the West Midlands.
- 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: M4 Target entity description: M4 is one of the lines of the Bucharest Metro rapid transit system, serving several northern and northwestern districts of Romania’s capital.
-
A.
M4
M4 is a boat line that operates as part of Geneva’s public transport network, providing passenger service across Lake Geneva.
-
B.
M4
M4 is a major British motorway that runs between London and South Wales, serving as a key route for traffic to and from the west of England.
-
C.
M4
M4 is a general-purpose macro processing language and preprocessor commonly used in Unix-like build systems and tools such as GNU Autoconf.
-
D.
M4
M4 is a driverless metro line in the Copenhagen Metro system that serves key waterfront and urban development areas of the city.
-
E.
M40
M40 is a major British motorway linking London with Birmingham and the West Midlands.
- F. None of above. chosen
Statements (34)
| Predicate | Object |
|---|---|
| instanceOf |
Bucharest Metro line
ⓘ
rapid transit line ⓘ |
| connectsWith |
M1
ⓘ
M3 ⓘ |
| country | Romania ⓘ |
| electrification | third rail ⓘ |
| gauge | standard gauge ⓘ |
| hasLineColor | yellow ⓘ |
| hasRollingStock |
Bombardier Movia metro trains
ⓘ
CAF metro trains ⓘ |
| hasStation |
1 Mai
ⓘ
Basarab ⓘ Gara de Nord 2 ⓘ Grivița ⓘ Jiului ⓘ Laminorului ⓘ Parc Bazilescu ⓘ Străulești ⓘ |
| hasTerminus |
Gara de Nord 2
ⓘ
Străulești ⓘ |
| languageOfName |
Romanian
ⓘ
linked to:
Romanian language
|
| locatedIn |
Bucharest
ⓘ
Romania ⓘ |
| numberOfTracks | 2 ⓘ |
| openedInStages | true ⓘ |
| openingDate | 2000 ⓘ |
| operator | Metrorex ⓘ |
| owner | Metrorex ⓘ |
| partOfNetwork | Bucharest Metro ⓘ |
| serves |
northern districts of Bucharest
ⓘ
northwestern districts of Bucharest ⓘ |
| servesFacility |
Gara de Nord railway station
ⓘ
linked to:
Gara de Nord metro station
|
| system | Bucharest Metro ⓘ |
| transportType | rapid transit ⓘ |
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: M4 Description of subject: M4 is one of the lines of the Bucharest Metro rapid transit system, serving several northern and northwestern districts of Romania’s capital.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.