Severn Tunnel
E46960
Severn Tunnel is a major railway tunnel in the United Kingdom that runs beneath the River Severn, linking South West England with South Wales.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Severn Tunnel canonical | 7 |
| Severn Tunnel Junction | 1 |
| Severn Tunnel railway line | 1 |
| Severn Tunnel works | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T333004 — 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: Severn Tunnel Context triple: [Severn, hasCrossing, Severn Tunnel]
-
A.
Channel Tunnel
The Channel Tunnel is a 50-kilometer undersea rail tunnel linking the United Kingdom and France, serving as a major passenger and freight transport route between the two countries.
-
B.
Long Bridge
Long Bridge is a major railroad bridge over the Potomac River in Washington, D.C., carrying freight and passenger trains between the District of Columbia and Virginia.
-
C.
Thelwall Viaduct
Thelwall Viaduct is a major motorway bridge in north-west England that carries the M6 over the River Mersey and surrounding waterways near Warrington.
-
D.
Barton Swing Aqueduct
Barton Swing Aqueduct is a pioneering movable navigable aqueduct in Greater Manchester, England, that carries the Bridgewater Canal over the Manchester Ship Canal by swinging aside to allow large ships to pass.
-
E.
Manchester Ship Canal
The Manchester Ship Canal is a major 19th-century inland waterway in northwest England that enabled ocean-going ships to reach the industrial city of Manchester from the Irish Sea.
- 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: Severn Tunnel Target entity description: Severn Tunnel is a major railway tunnel in the United Kingdom that runs beneath the River Severn, linking South West England with South Wales.
-
A.
Channel Tunnel
The Channel Tunnel is a 50-kilometer undersea rail tunnel linking the United Kingdom and France, serving as a major passenger and freight transport route between the two countries.
-
B.
Long Bridge
Long Bridge is a major railroad bridge over the Potomac River in Washington, D.C., carrying freight and passenger trains between the District of Columbia and Virginia.
-
C.
Thelwall Viaduct
Thelwall Viaduct is a major motorway bridge in north-west England that carries the M6 over the River Mersey and surrounding waterways near Warrington.
-
D.
Barton Swing Aqueduct
Barton Swing Aqueduct is a pioneering movable navigable aqueduct in Greater Manchester, England, that carries the Bridgewater Canal over the Manchester Ship Canal by swinging aside to allow large ships to pass.
-
E.
Manchester Ship Canal
The Manchester Ship Canal is a major 19th-century inland waterway in northwest England that enabled ocean-going ships to reach the industrial city of Manchester from the Irish Sea.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf | railway tunnel ⓘ |
| builder | Great Western Railway ⓘ |
| category |
Rail transport in England
ⓘ
Rail transport in Wales ⓘ Tunnels under rivers ⓘ |
| chiefEngineer | Charles Richardson ⓘ |
| connects |
England
ⓘ
Wales ⓘ |
| constructionEnd | 1886 ⓘ |
| constructionMethod | tunnelling from multiple shafts ⓘ |
| constructionStart | 1873 ⓘ |
| country | United Kingdom ⓘ |
| crossesBorderBetween | England and Wales ⓘ |
| designer |
Sir John Fowler
ⓘ
surface form:
John Hawkshaw
|
| electrification | 25 kV AC overhead ⓘ |
| electrificationCompleted | 2010s ⓘ |
| endCounty | South Gloucestershire ⓘ |
| endPoint | Pilning ⓘ |
| gauge | standard gauge ⓘ |
| hasStructure | Sudbrook pumping station ⓘ |
| hasVentilationShaft |
Shafts on English side
ⓘ
Sudbrook shaft ⓘ |
| historicalOperator |
British Rail
ⓘ
Great Western Railway ⓘ |
| length |
about 4.35 miles
ⓘ
about 7.01 kilometres ⓘ |
| locatedIn |
Bristol Channel
ⓘ
surface form:
Bristol Channel area
Severn ⓘ
surface form:
River Severn
South Wales ⓘ southwest England ⓘ
surface form:
South West England
|
| locatedNear |
Severn Bridge
ⓘ
surface form:
Second Severn Crossing
Severn Bridge ⓘ |
| notableFeature | one of the longest mainline railway tunnels in the UK ⓘ |
| notableIssue | water ingress requiring continuous pumping ⓘ |
| opened | 1886 ⓘ |
| openedForPassengerTraffic | 1886 ⓘ |
| operator | Network Rail ⓘ |
| owner | Network Rail ⓘ |
| partOf |
South Wales Main Line
ⓘ
surface form:
Great Western Main Line route between London and South Wales
|
| purpose | railway transport ⓘ |
| railwayLine | South Wales Main Line ⓘ |
| startCounty | Monmouthshire ⓘ |
| startPoint |
Severn Tunnel
self-linksurface differs
ⓘ
surface form:
Severn Tunnel Junction
|
| status | in use ⓘ |
| trackCount | double track ⓘ |
| traffic |
freight trains
ⓘ
passenger trains ⓘ |
| underlies |
Severn
ⓘ
surface form:
River Severn
|
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: Severn Tunnel Description of subject: Severn Tunnel is a major railway tunnel in the United Kingdom that runs beneath the River Severn, linking South West England with South Wales.
Referenced by (10)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Severn Tunnel Junction
this entity surface form:
Severn Tunnel railway line
this entity surface form:
Severn Tunnel works