Tehran Metro Line 4
E205502
Tehran Metro Line 4 is one of the main east–west rapid transit lines in Tehran’s metro network, serving key urban areas and providing access to major hubs including the route toward Mehrabad International Airport.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Tehran Metro Line 4 canonical | 8 |
| Tehran Metro Line 6 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1675681 — 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: Tehran Metro Line 4 Context triple: [Mehrabad International Airport, connectsTo, Tehran Metro Line 4]
-
A.
Tehran Metro Line 8
Tehran Metro Line 8 is a planned or operational rapid transit line within the Tehran Metro system, serving as part of the urban rail network in Iran’s capital.
-
B.
Tehran Metro Line 9
Tehran Metro Line 9 is a planned rapid transit line intended to expand and improve the urban rail network in Iran’s capital, Tehran.
-
C.
Tehran Metro
Tehran Metro is the rapid transit system serving Iran’s capital, providing extensive urban and suburban rail transport across the Tehran metropolitan area.
-
D.
Tehran Bus Rapid Transit
Tehran Bus Rapid Transit is a dedicated-lane bus network in Iran’s capital that provides high-capacity, rapid public transportation across major urban corridors.
-
E.
Haft-e Tir Metro Station
Haft-e Tir Metro Station is an underground station on the Tehran Metro network serving the busy Haft-e Tir Square area in central Tehran.
- 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: Tehran Metro Line 4 Target entity description: Tehran Metro Line 4 is one of the main east–west rapid transit lines in Tehran’s metro network, serving key urban areas and providing access to major hubs including the route toward Mehrabad International Airport.
-
A.
Tehran Metro Line 8
Tehran Metro Line 8 is a planned or operational rapid transit line within the Tehran Metro system, serving as part of the urban rail network in Iran’s capital.
-
B.
Tehran Metro Line 9
Tehran Metro Line 9 is a planned rapid transit line intended to expand and improve the urban rail network in Iran’s capital, Tehran.
-
C.
Tehran Metro
Tehran Metro is the rapid transit system serving Iran’s capital, providing extensive urban and suburban rail transport across the Tehran metropolitan area.
-
D.
Tehran Bus Rapid Transit
Tehran Bus Rapid Transit is a dedicated-lane bus network in Iran’s capital that provides high-capacity, rapid public transportation across major urban corridors.
-
E.
Haft-e Tir Metro Station
Haft-e Tir Metro Station is an underground station on the Tehran Metro network serving the busy Haft-e Tir Square area in central Tehran.
- F. None of above. chosen
Statements (25)
| Predicate | Object |
|---|---|
| instanceOf |
metro line
ⓘ
rapid transit line ⓘ |
| connectsArea |
eastern Tehran
ⓘ
western Tehran ⓘ |
| connectsTo |
Mehrabad International Airport route
ⓘ
other Tehran Metro lines at transfer stations ⓘ |
| hasColor | yellow ⓘ |
| hasDirection | east–west ⓘ |
| hasLanguageOfName | Persian ⓘ |
| hasNetworkRole | east–west backbone line ⓘ |
| hasRouteType | underground and surface ⓘ |
| hasService | passenger transport ⓘ |
| hasTrackGauge | standard gauge ⓘ |
| isMajorCorridorIn | Tehran public transport network ⓘ |
| isNumbered | 4 ⓘ |
| locatedIn |
Tehran
ⓘ
Tehran Province ⓘ |
| locatedInCountry | Iran ⓘ |
| operator |
Tehran Urban and Suburban Railway and Bus Company
ⓘ
surface form:
Tehran Urban and Suburban Railways Organization
|
| partOf | Tehran Metro ⓘ |
| serves | key urban areas of Tehran ⓘ |
| servesFunction | urban mass transit ⓘ |
| system |
Tehran Metro
ⓘ
surface form:
Tehran Metro network
|
| transportType | rapid transit ⓘ |
| usesElectrification | third rail ⓘ |
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: Tehran Metro Line 4 Description of subject: Tehran Metro Line 4 is one of the main east–west rapid transit lines in Tehran’s metro network, serving key urban areas and providing access to major hubs including the route toward Mehrabad International Airport.
Referenced by (9)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Tehran Metro Line 6
subject surface form:
Line 1 (Tehran Metro)
subject surface form:
Line 6 (Tehran Metro)