C-4
E140899
C-4 is a major commuter rail line in the Cercanías Madrid network that connects central Madrid with several key suburbs and outlying towns.
All labels observed (1)
| Label | Occurrences |
|---|---|
| C-4 canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T1236006 — 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: C-4 Context triple: [Cercanías Madrid, line, C-4]
-
A.
C40
C40 is a global network of major cities collaborating to address climate change and drive urban climate leadership.
-
B.
CT40 cased telescoped weapon system
The CT40 cased telescoped weapon system is a modern 40 mm autocannon that uses cased telescoped ammunition to provide high firepower in a compact turret suitable for contemporary armored fighting vehicles.
-
C.
Mk 84 bomb
The Mk 84 bomb is a 2,000-pound class general-purpose unguided bomb widely used by the U.S. and allied air forces as the warhead basis for various precision-guided munitions.
-
D.
Speer
Speer is a German surname most famously associated with Albert Speer, the Nazi architect and Minister of Armaments and War Production during World War II.
-
E.
Mk 82 bomb
The Mk 82 bomb is a widely used 500-pound general-purpose unguided aerial bomb that serves as the standard warhead for many precision-guided munitions.
- 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: C-4 Target entity description: C-4 is a major commuter rail line in the Cercanías Madrid network that connects central Madrid with several key suburbs and outlying towns.
-
A.
C40
C40 is a global network of major cities collaborating to address climate change and drive urban climate leadership.
-
B.
CT40 cased telescoped weapon system
The CT40 cased telescoped weapon system is a modern 40 mm autocannon that uses cased telescoped ammunition to provide high firepower in a compact turret suitable for contemporary armored fighting vehicles.
-
C.
Mk 84 bomb
The Mk 84 bomb is a 2,000-pound class general-purpose unguided bomb widely used by the U.S. and allied air forces as the warhead basis for various precision-guided munitions.
-
D.
Speer
Speer is a German surname most famously associated with Albert Speer, the Nazi architect and Minister of Armaments and War Production during World War II.
-
E.
Mk 82 bomb
The Mk 82 bomb is a widely used 500-pound general-purpose unguided aerial bomb that serves as the standard warhead for many precision-guided munitions.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
Cercanías Madrid line
ⓘ
commuter rail line ⓘ |
| connects |
central Madrid
ⓘ
outlying towns near Madrid ⓘ suburbs of Madrid ⓘ |
| country | Spain ⓘ |
| electrification | 3 kV DC overhead line ⓘ |
| hasFareSystem | Cercanías Madrid zonal fares ⓘ |
| hasLineNumber | 4 ⓘ |
| hasRollingStock | electric multiple units ⓘ |
| hasServicePattern | radial line from central Madrid ⓘ |
| hasServiceType | commuter rail ⓘ |
| hasStyle | Cercanías ⓘ |
| locatedIn |
Community of Madrid
ⓘ
Spain ⓘ |
| network | Spanish suburban rail network ⓘ |
| operator |
Renfe Cercanías
ⓘ
linked to:
Cercanías Madrid commuter rail
|
| partOf |
Cercanías Madrid
ⓘ
linked to:
Cercanías Madrid commuter rail
|
| primaryFunction | commuter transport ⓘ |
| railSystem | Renfe Operadora ⓘ |
| serves |
Alcobendas
ⓘ
Colmenar Viejo ⓘ Getafe ⓘ Madrid ⓘ Parla ⓘ San Sebastián de los Reyes ⓘ |
| terminusAt |
towns north of Madrid
ⓘ
towns south of Madrid ⓘ |
| usesInfrastructure | Spanish railway network ⓘ |
| usesTrackGauge | Iberian gauge ⓘ |
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: C-4 Description of subject: C-4 is a major commuter rail line in the Cercanías Madrid network that connects central Madrid with several key suburbs and outlying towns.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
Cercanías Madrid commuter rail