M4
E338240
M4 is a driverless metro line in the Copenhagen Metro system that serves key waterfront and urban development areas of the city.
All labels observed (1)
| Label | Occurrences |
|---|---|
| M4 canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T3220437 — 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: [Copenhagen 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.
M40
M40 is a major British motorway linking London with Birmingham and the West Midlands.
-
E.
M44
M44 is an open star cluster in the constellation Cancer, also known as the Beehive Cluster or Praesepe, and is one of the nearest and most prominent clusters visible to the naked eye.
- 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 a driverless metro line in the Copenhagen Metro system that serves key waterfront and urban development areas of the city.
-
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.
M40
M40 is a major British motorway linking London with Birmingham and the West Midlands.
-
E.
M44
M44 is an open star cluster in the constellation Cancer, also known as the Beehive Cluster or Praesepe, and is one of the nearest and most prominent clusters visible to the naked eye.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
driverless metro line
ⓘ
metro line ⓘ |
| character |
elevated
ⓘ
underground ⓘ |
| connectsWith |
Copenhagen suburban bus network
ⓘ
M1 ⓘ M2 ⓘ M3 ⓘ S-train network in Copenhagen ⓘ regional trains in Copenhagen ⓘ |
| country | Denmark ⓘ |
| electrification | 750 V DC third rail ⓘ |
| fareSystem | DOT (Din Offentlige Transport) ⓘ |
| fareZoneSystem | Greater Copenhagen fare zones ⓘ |
| hasAccessibility | step-free access at all stations ⓘ |
| hasColour | blue ⓘ |
| hasPlatformScreenDoors | true ⓘ |
| isDriverless | true ⓘ |
| isPartOfNetwork |
Copenhagen Metro network
ⓘ
linked to:
Copenhagen Metro
|
| isRapidTransit | true ⓘ |
| isUrbanRail | true ⓘ |
| languageOfSignage |
Danish
ⓘ
English ⓘ |
| lineNumber | M4 ⓘ |
| locatedIn |
Copenhagen
ⓘ
Denmark ⓘ |
| numberOfTracks | 2 ⓘ |
| operator | Metro Service A/S ⓘ |
| owner |
Metroselskabet
ⓘ
linked to:
Metroselskabet I/S
|
| partOf | Copenhagen Metro ⓘ |
| rollingStock |
Ansaldobreda Driverless Metro
ⓘ
Hitachi Rail Italy driverless metro trains ⓘ
linked to:
Hitachi Rail Italy Driverless Metro trains
|
| safetySystem | automatic train protection ⓘ |
| serves |
Nordhavn
ⓘ
Sydhavn ⓘ inner harbour areas of Copenhagen ⓘ urban development areas of Copenhagen ⓘ waterfront areas of Copenhagen ⓘ |
| system | Copenhagen Metro ⓘ |
| technology | automatic train operation ⓘ |
| ticketing | integrated with Copenhagen public transport ⓘ |
| trackGauge |
1435 mm
ⓘ
standard gauge ⓘ |
| transmission | third rail ⓘ |
| usesSignallingSystem |
CBTC
ⓘ
communications-based train control ⓘ |
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 a driverless metro line in the Copenhagen Metro system that serves key waterfront and urban development areas of the city.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.