Triple

T6896521

Position	Surface form	Disambiguated ID	Type / Status
Subject	BART Antioch–SFO+Millbrae line	`E159382`	entity
Predicate	partOf	`P40`	FINISHED
Object	BART Antioch extension corridor The BART Antioch extension corridor is the transit infrastructure corridor in eastern Contra Costa County that carries BART’s eBART service between Pittsburg/Bay Point and Antioch as part of the broader Antioch extension project.	`E627702`	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: BART Antioch extension corridor | Statement: [BART Antioch–SFO+Millbrae line, partOf, BART Antioch extension corridor]

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

Target entity: BART Antioch extension corridor
Context triple: [BART Antioch–SFO+Millbrae line, partOf, BART Antioch extension corridor]

A. BART Silicon Valley extension
The BART Silicon Valley extension is a major Bay Area Rapid Transit project extending rail service into Santa Clara County, including new stations in San José and surrounding areas.
B. BART Antioch–SFO+Millbrae line
The BART Antioch–SFO+Millbrae line is a Bay Area Rapid Transit service that runs between Antioch in the East Bay and San Francisco International Airport and Millbrae, connecting suburban communities with major regional transit hubs.
C. Altamont Corridor Express
Altamont Corridor Express is a commuter rail service in Northern California that connects Central Valley communities with the San Francisco Bay Area.
D. BART Fremont line
The BART Fremont line is a Bay Area Rapid Transit route in the San Francisco Bay Area that historically extended service to the city of Fremont in southern Alameda County.
E. San Francisco Central Subway project
The San Francisco Central Subway project is a major Muni Metro light rail extension in San Francisco designed to improve north–south transit connectivity by linking neighborhoods such as SoMa, Union Square, and Chinatown.
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: BART Antioch extension corridor
Triple: [BART Antioch–SFO+Millbrae line, partOf, BART Antioch extension corridor]

Generated description

The BART Antioch extension corridor is the transit infrastructure corridor in eastern Contra Costa County that carries BART’s eBART service between Pittsburg/Bay Point and Antioch as part of the broader Antioch extension project.

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

Target entity: BART Antioch extension corridor
Target entity description: The BART Antioch extension corridor is the transit infrastructure corridor in eastern Contra Costa County that carries BART’s eBART service between Pittsburg/Bay Point and Antioch as part of the broader Antioch extension project.

A. BART Silicon Valley extension
The BART Silicon Valley extension is a major Bay Area Rapid Transit project extending rail service into Santa Clara County, including new stations in San José and surrounding areas.
B. BART Antioch–SFO+Millbrae line
The BART Antioch–SFO+Millbrae line is a Bay Area Rapid Transit service that runs between Antioch in the East Bay and San Francisco International Airport and Millbrae, connecting suburban communities with major regional transit hubs.
C. Altamont Corridor Express
Altamont Corridor Express is a commuter rail service in Northern California that connects Central Valley communities with the San Francisco Bay Area.
D. BART Fremont line
The BART Fremont line is a Bay Area Rapid Transit route in the San Francisco Bay Area that historically extended service to the city of Fremont in southern Alameda County.
E. San Francisco Central Subway project
The San Francisco Central Subway project is a major Muni Metro light rail extension in San Francisco designed to improve north–south transit connectivity by linking neighborhoods such as SoMa, Union Square, and Chinatown.
F. None of above. chosen

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_69c6883822e0819091e321526f20ae0a`	completed	March 27, 2026, 1:38 p.m.
NER	Named-entity recognition	`batch_69c6d95ae3f88190b7f5d440f90ae9f9`	completed	March 27, 2026, 7:24 p.m.
NED1	Entity disambiguation (via context triple)	`batch_69c748dfd9608190891c8df48b771e20`	completed	March 28, 2026, 3:20 a.m.
NEDg	Description generation	`batch_69c749d4b088819095f991f976592d04`	completed	March 28, 2026, 3:24 a.m.
NED2	Entity disambiguation (via description)	`batch_69c74aab12988190bd23cfcc06c55cde`	completed	March 28, 2026, 3:27 a.m.

Created at: March 27, 2026, 2:24 p.m.