Linha do Tua (partly closed)
E302850
Linha do Tua (partly closed) is a historic narrow-gauge railway line in northeastern Portugal, known for its scenic route along the Tua River and partial closure due to dam construction and safety concerns.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Linha do Tua (Tua railway line) | 1 |
| Linha do Tua (partly closed) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2853863 — 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: Linha do Tua (partly closed) Context triple: [Portuguese national rail network, includesLine, Linha do Tua (partly closed)]
-
A.
Algarve line
The Algarve line is a major railway route in southern Portugal that connects the region’s coastal towns and cities along the Algarve.
-
B.
Barreiro–Faro section
The Barreiro–Faro section is a major railway segment in southern Portugal that connects the Lisbon area to the Algarve along the Linha do Sul.
-
C.
Linha do Alentejo
Linha do Alentejo is a Portuguese railway line that connects Lisbon to the Alentejo region, serving as an important route for both passenger and freight transport in southern Portugal.
-
D.
Nassau-Dillenburg line
The Nassau-Dillenburg line was a cadet branch of the House of Nassau that produced several influential German and Dutch princes, including the ancestors of the Dutch royal family.
-
E.
Sanin Main Line (partial)
The Sanin Main Line is a major railway route in western Japan that runs along the Sea of Japan coast, connecting numerous cities and rural areas across the San'in region.
- 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: Linha do Tua (partly closed) Target entity description: Linha do Tua (partly closed) is a historic narrow-gauge railway line in northeastern Portugal, known for its scenic route along the Tua River and partial closure due to dam construction and safety concerns.
-
A.
Algarve line
The Algarve line is a major railway route in southern Portugal that connects the region’s coastal towns and cities along the Algarve.
-
B.
Barreiro–Faro section
The Barreiro–Faro section is a major railway segment in southern Portugal that connects the Lisbon area to the Algarve along the Linha do Sul.
-
C.
Linha do Alentejo
Linha do Alentejo is a Portuguese railway line that connects Lisbon to the Alentejo region, serving as an important route for both passenger and freight transport in southern Portugal.
-
D.
Nassau-Dillenburg line
The Nassau-Dillenburg line was a cadet branch of the House of Nassau that produced several influential German and Dutch princes, including the ancestors of the Dutch royal family.
-
E.
Sanin Main Line (partial)
The Sanin Main Line is a major railway route in western Japan that runs along the Sea of Japan coast, connecting numerous cities and rural areas across the San'in region.
- F. None of above. chosen
Statements (29)
| Predicate | Object |
|---|---|
| instanceOf |
narrow-gauge railway line
ⓘ
railway infrastructure ⓘ |
| closureReason |
dam construction
ⓘ
safety concerns ⓘ |
| connectedTo | Linha do Douro ⓘ |
| country | Portugal ⓘ |
| electrification | not electrified ⓘ |
| environmentContext | Tua Valley ⓘ |
| followsRiver | Rio Tua ⓘ |
| formerOperator |
Caminhos de Ferro Portugueses
ⓘ
linked to:
Comboios de Portugal (CP)
|
| gauge | metre gauge ⓘ |
| heritageDebate | controversy over closure and dam project ⓘ |
| heritageValue | high historical significance ⓘ |
| impactOfClosure | loss of regular passenger services on most of the line ⓘ |
| impactOfDam | submergence of part of the alignment ⓘ |
| knownFor |
historic narrow-gauge operation
ⓘ
scenic route along the Tua River ⓘ |
| languageOfName | Portuguese ⓘ |
| locatedIn | northeastern Portugal ⓘ |
| nameMeaning | Tua Line ⓘ |
| operator | Comboios de Portugal ⓘ |
| partOf | Portuguese narrow-gauge railway network ⓘ |
| region |
Trás-os-Montes
ⓘ
linked to:
Trás-os-Montes e Alto Douro
|
| safetyIssue | derailment risk on steep and winding sections ⓘ |
| status | partly closed ⓘ |
| terminus | Tua railway station ⓘ |
| tourism | railway tourism attraction ⓘ |
| trackType | single track ⓘ |
| transportRole | served remote rural communities ⓘ |
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: Linha do Tua (partly closed) Description of subject: Linha do Tua (partly closed) is a historic narrow-gauge railway line in northeastern Portugal, known for its scenic route along the Tua River and partial closure due to dam construction and safety concerns.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Linha do Tua (partly closed)