U4 line
E397966
The U4 line is one of Berlin's U-Bahn subway lines, running a short route in the inner city and connecting key stations including Nollendorfplatz.
All labels observed (2)
How this entity was disambiguated
This entity first appeared as the object of triple T3848681 — 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: U4 line Context triple: [Nollendorfplatz area, servedBy, U4 line]
-
A.
U1 line
The U1 line is a route of the Frankfurt U-Bahn rapid transit system that connects central Frankfurt with several northern suburbs.
-
B.
U6 line
The U6 line is a route of the Frankfurt U-Bahn rapid transit system that connects various districts across the city, including central hubs such as Hauptwache.
-
C.
U3 line
The U3 line is a route of the Frankfurt U-Bahn rapid transit system that connects central Frankfurt with its northwestern suburbs.
-
D.
U7 line
The U7 line is a route of the Frankfurt U-Bahn rapid transit system that runs across the city and serves major central stations including Hauptwache.
-
E.
U1 metro line
The U1 metro line is one of Vienna’s main underground lines, running north–south through the city and connecting key districts and transport hubs.
- 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: U4 line Target entity description: The U4 line is one of Berlin's U-Bahn subway lines, running a short route in the inner city and connecting key stations including Nollendorfplatz.
-
A.
U1 line
The U1 line is a route of the Frankfurt U-Bahn rapid transit system that connects central Frankfurt with several northern suburbs.
-
B.
U6 line
The U6 line is a route of the Frankfurt U-Bahn rapid transit system that connects various districts across the city, including central hubs such as Hauptwache.
-
C.
U3 line
The U3 line is a route of the Frankfurt U-Bahn rapid transit system that connects central Frankfurt with its northwestern suburbs.
-
D.
U7 line
The U7 line is a route of the Frankfurt U-Bahn rapid transit system that runs across the city and serves major central stations including Hauptwache.
-
E.
U1 metro line
The U1 metro line is one of Vienna’s main underground lines, running north–south through the city and connecting key districts and transport hubs.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
Berlin U-Bahn line
ⓘ
public transport route ⓘ rapid transit line ⓘ |
| connects |
Nollendorfplatz U-Bahn interchange
ⓘ
linked to:
Nollendorfplatz U-Bahn station
Schöneberg town hall area ⓘ
linked to:
Schöneberg
|
| country | Germany ⓘ |
| electrification | third rail ⓘ |
| fareSystem | Verkehrsverbund Berlin-Brandenburg ⓘ |
| hasInterchange | Nollendorfplatz ONNED1 ⓘ |
| hasInterchangeWithLine |
U1 line
ⓘ
U2 line ⓘ U3 line ⓘ |
| hasStation |
Bayerischer Platz
ⓘ
Innsbrucker Platz ⓘ Nollendorfplatz ⓘ Rathaus Schöneberg ⓘ Viktoria-Luise-Platz ⓘ |
| isOneOf | shortest Berlin U-Bahn lines ⓘ |
| languageOfName | German ⓘ |
| lineColor | yellow-green ⓘ |
| lineNumber | 4 ⓘ |
| locatedIn | Berlin ⓘ |
| mapSymbol | U4 in a colored square ⓘ |
| namedAfter | line number 4 in Berlin U-Bahn network ⓘ |
| numberOfTracks | 2 ⓘ |
| openingDate | 1910 ⓘ |
| operatedBy | Berliner Verkehrsbetriebe ⓘ |
| owner |
Land Berlin
ⓘ
linked to:
federal state of Berlin
|
| partOf | inner-city Berlin U-Bahn network ⓘ |
| region | Berlin metropolitan area ⓘ |
| rollingStockType | small-profile Berlin U-Bahn trains ⓘ |
| routeCharacteristic | entirely underground ⓘ |
| safetySystem | train protection system (Berlin U-Bahn standard) ⓘ |
| servesBorough |
Charlottenburg-Wilmersdorf
NERFINISHED
ⓘ
Tempelhof-Schöneberg NERFINISHED ⓘ |
| servicePattern | all-stations ⓘ |
| serviceType | passenger transport ⓘ |
| shortName | U4 ⓘ |
| system | Berlin U-Bahn ⓘ |
| terminus |
Innsbrucker Platz
ⓘ
Nollendorfplatz ⓘ |
| trackGauge | standard gauge ⓘ |
| transportMode | subway ⓘ |
| usesInfrastructure |
Berlin U-Bahn small-profile tunnel network
ⓘ
linked to:
Berlin U-Bahn
|
| zone | Berlin AB ⓘ |
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: U4 line Description of subject: The U4 line is one of Berlin's U-Bahn subway lines, running a short route in the inner city and connecting key stations including Nollendorfplatz.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: U4 line