Triple

T12489366

Position	Surface form	Disambiguated ID	Type / Status
Subject	Morden depot	`E298520`	entity
Predicate	associatedWith	`P37`	FINISHED
Object	Morden extension of the City and South London Railway The Morden extension of the City and South London Railway was a major early 20th-century southward expansion of London’s deep-level tube network that helped shape the modern Northern line.	`E304869`	NE FINISHED

How this triple was built (4 steps)

Every LLM step that produced this triple, in pipeline order — named-entity classification, the disambiguation choices (the exact options shown, with the pick highlighted), and the generated description. The batch + timestamp of each is in the Provenance table below.

NER Named-entity recognition gpt-5-mini

Instruction

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Input

Phrase: Morden extension of the City and South London Railway | Statement: [Morden depot, associatedWith, Morden extension of the City and South London Railway]

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Morden extension of the City and South London Railway
Context triple: [Morden depot, associatedWith, Morden extension of the City and South London Railway]

A. City and South London Railway
The City and South London Railway was the world's first deep-level electric tube railway in London, forming a key precursor to today's Northern line of the London Underground.
B. Metropolitan District Railway
The Metropolitan District Railway was a historic London railway company that developed much of what is now the District line of the London Underground in the late 19th and early 20th centuries.
C. Paddington–Farringdon section of the Metropolitan Railway
The Paddington–Farringdon section of the Metropolitan Railway was the original stretch of the world’s first underground railway in London, linking Paddington to Farringdon when it opened in 1863.
D. Central London Railway
Central London Railway was an early deep-level underground railway in London that later became the core of the London Underground's Central line.
E. Jubilee line extension
The Jubilee line extension is a major late-20th-century expansion of the London Underground that introduced new stations and modern infrastructure to connect central London with the Docklands and east London.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NEDg Description generation gpt-5.1

Instruction

Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"

Input

Entity: Morden extension of the City and South London Railway
Triple: [Morden depot, associatedWith, Morden extension of the City and South London Railway]

Generated description

The Morden extension of the City and South London Railway was a major early 20th-century southward expansion of London’s deep-level tube network that helped shape the modern Northern line.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Morden extension of the City and South London Railway
Target entity description: The Morden extension of the City and South London Railway was a major early 20th-century southward expansion of London’s deep-level tube network that helped shape the modern Northern line.

A. City and South London Railway chosen
The City and South London Railway was the world's first deep-level electric tube railway in London, forming a key precursor to today's Northern line of the London Underground.
B. Metropolitan District Railway
The Metropolitan District Railway was a historic London railway company that developed much of what is now the District line of the London Underground in the late 19th and early 20th centuries.
C. Paddington–Farringdon section of the Metropolitan Railway
The Paddington–Farringdon section of the Metropolitan Railway was the original stretch of the world’s first underground railway in London, linking Paddington to Farringdon when it opened in 1863.
D. Central London Railway
Central London Railway was an early deep-level underground railway in London that later became the core of the London Underground's Central line.
E. Jubilee line extension
The Jubilee line extension is a major late-20th-century expansion of the London Underground that introduced new stations and modern infrastructure to connect central London with the Docklands and east London.
F. None of above.

Provenance (5 batches)

The batch behind each pipeline step, in order, with when it ran. Timestamps are batch-level — stages were processed in waves, so the object chain (NER → NED1 → NEDg → NED2) reads in order, but predicate / elicitation batches can sit in a different wave.

Step	Stage	Batch ID	Status	When
creating	Elicitation	`batch_69d6ada377208190a36011199a4d8558`	completed	April 8, 2026, 7:33 p.m.
NER	Named-entity recognition	`batch_69d94de1db9481909ddf70eb81cdb714`	completed	April 10, 2026, 7:22 p.m.
NED1	Entity disambiguation (via context triple)	`batch_69f64ba7d8bc8190acc1f0d537a5bbbb`	completed	May 2, 2026, 7:08 p.m.
NEDg	Description generation	`batch_69f64c7c5d04819094fcbee0a4b5cbb4`	completed	May 2, 2026, 7:11 p.m.
NED2	Entity disambiguation (via description)	`batch_69f64d653b988190b11d061f55ef7192`	completed	May 2, 2026, 7:15 p.m.

Created at: April 8, 2026, 9:56 p.m.