Sofia Metro
E165788
Sofia Metro is the rapid transit system serving Bulgaria’s capital city, providing high-capacity urban rail transport across Sofia and its metropolitan area.
All labels observed (6)
| Label | Occurrences |
|---|---|
| Sofia Metro canonical | 29 |
| Sofia Metro network | 2 |
| Line 2 (Sofia Metro) | 1 |
| Metropolitan Sofia (Sofia Metro operator) | 1 |
| Sofia Metro Line 2 | 1 |
| Sofia Metro Line 3 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1451477 — 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: Sofia Metro Context triple: [Sofia, hasPublicTransportSystem, Sofia Metro]
-
A.
Bucharest Metro
The Bucharest Metro is the rapid transit system serving Romania’s capital city, providing high-capacity urban rail transport across Bucharest.
-
B.
Saint Petersburg Metro
The Saint Petersburg Metro is a major rapid transit system in Saint Petersburg, Russia, renowned for its deep underground stations and ornate, palace-like architecture.
-
C.
Moscow Metro
The Moscow Metro is a major rapid transit system in Moscow renowned for its extensive network, high passenger capacity, and ornately decorated stations often likened to underground palaces.
-
D.
Tbilisi Metro
Tbilisi Metro is the rapid transit system serving Georgia’s capital city, providing a primary backbone for urban public transportation.
-
E.
Moscow tram network
The Moscow tram network is an extensive urban tramway system that complements the Moscow Metro by providing surface-level public transportation across the city.
- 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: Sofia Metro Target entity description: Sofia Metro is the rapid transit system serving Bulgaria’s capital city, providing high-capacity urban rail transport across Sofia and its metropolitan area.
-
A.
Bucharest Metro
The Bucharest Metro is the rapid transit system serving Romania’s capital city, providing high-capacity urban rail transport across Bucharest.
-
B.
Saint Petersburg Metro
The Saint Petersburg Metro is a major rapid transit system in Saint Petersburg, Russia, renowned for its deep underground stations and ornate, palace-like architecture.
-
C.
Moscow Metro
The Moscow Metro is a major rapid transit system in Moscow renowned for its extensive network, high passenger capacity, and ornately decorated stations often likened to underground palaces.
-
D.
Tbilisi Metro
Tbilisi Metro is the rapid transit system serving Georgia’s capital city, providing a primary backbone for urban public transportation.
-
E.
Moscow tram network
The Moscow tram network is an extensive urban tramway system that complements the Moscow Metro by providing surface-level public transportation across the city.
- F. None of above. chosen
Statements (51)
| Predicate | Object |
|---|---|
| instanceOf |
metro system
ⓘ
public transport system ⓘ rapid transit system ⓘ |
| beganOperation | 1998-01-28 ⓘ |
| connectsTo |
Sofia Airport
ⓘ
Sofia Central Bus Station ⓘ
linked to:
Central Bus Station Sofia metro station
Sofia Central Railway Station ⓘ
linked to:
Sofia Central Station
|
| country | Bulgaria ⓘ |
| electrification | third rail ⓘ |
| fareSystem | integrated urban ticketing system of Sofia ⓘ |
| gauge | standard gauge ⓘ |
| hasFeature |
interchange stations
ⓘ
surface sections ⓘ underground sections ⓘ |
| hasLine |
Line 1
ⓘ
Line 2 ⓘ Line 3 ⓘ Line 4 ⓘ |
| hasRollingStock |
Metrovagonmash trains
ⓘ
Pesa trains ⓘ Siemens Inspiro trains ⓘ |
| hasStation |
Business Park Sofia station
ⓘ
Central Bus Station Sofia metro station ⓘ Central Railway Station Sofia metro station ⓘ
linked to:
Sofia Central Station
Mladost 1 station ⓘ Nadezhda station ⓘ National Palace of Culture station ⓘ
linked to:
National Palace of Culture
Obelya station ⓘ Orlov Most (Eagle’s Bridge) station ⓘ Serdika II station ⓘ
linked to:
Serdika station
Serdika station ⓘ Sofia Airport station ⓘ
linked to:
Sofia Airport
Vitosha station ⓘ |
| languageOfSignage |
Bulgarian
ⓘ
English ⓘ |
| locatedIn |
Europe
ⓘ
Sofia ⓘ Sofia City Province ⓘ |
| managedBy | Metropoliten JSC ⓘ |
| numberOfLines | 4 ⓘ |
| openingYear | 1998 ⓘ |
| operator | Metropoliten JSC ⓘ |
| owner |
Sofia Municipality
ⓘ
linked to:
Sofia City Province
|
| partOf | public transport network of Sofia ⓘ |
| primaryFunction | urban rail transport ⓘ |
| serves |
Sofia
ⓘ
Sofia metropolitan area ⓘ
linked to:
Sofia
|
| trackGauge | 1435 mm ⓘ |
| transitType |
heavy rail
ⓘ
partially elevated railway ⓘ underground railway ⓘ |
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: Sofia Metro Description of subject: Sofia Metro is the rapid transit system serving Bulgaria’s capital city, providing high-capacity urban rail transport across Sofia and its metropolitan area.
Referenced by (35)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Sofia Metro
linked to: Sofia Metro
linked to: Sofia Metro
subject linked to:
Line 1
subject linked to:
Line 1
linked to: Sofia Metro
subject linked to:
Line 2
subject linked to:
Line 3
linked to: Sofia Metro
subject linked to:
Siemens Inspiro trains
linked to: Sofia Metro
subject linked to:
81-740 Rusich metro train