Triple

T20530662

Position	Surface form	Disambiguated ID	Type / Status
Subject	Los Angeles–Seattle rail corridor	`E504057`	entity
Predicate	usesRailLine	`P848`	FINISHED
Object	Union Pacific Los Angeles Subdivision The Union Pacific Los Angeles Subdivision is a major freight rail line in Southern California that forms a key segment of Union Pacific’s north–south mainline between Los Angeles and the Pacific Northwest.	`E1435696`	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: Union Pacific Los Angeles Subdivision | Statement: [Los Angeles–Seattle rail corridor, usesRailLine, Union Pacific Los Angeles Subdivision]

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

Target entity: Union Pacific Los Angeles Subdivision
Context triple: [Los Angeles–Seattle rail corridor, usesRailLine, Union Pacific Los Angeles Subdivision]

A. Union Pacific Railroad Coast Subdivision
The Union Pacific Railroad Coast Subdivision is a key rail corridor in California that carries both freight and commuter services, including trains operated by the Altamont Corridor Express.
B. Union Pacific Valley Subdivision
The Union Pacific Valley Subdivision is a railroad line operated by Union Pacific that serves as a key freight corridor within its regional rail network.
C. Union Pacific Geneva Subdivision
The Union Pacific Geneva Subdivision is a major freight rail line in the Chicago area used by Union Pacific Railroad for both mainline operations and commuter rail services.
D. Union Pacific Railroad Fresno Subdivision
The Union Pacific Railroad Fresno Subdivision is a key freight and passenger rail corridor in California’s Central Valley that carries both Union Pacific trains and Altamont Corridor Express commuter services.
E. Union Pacific Railroad Niles Subdivision
The Union Pacific Railroad Niles Subdivision is a freight and passenger rail corridor in California’s East Bay and Tri-Valley region that carries both Union Pacific trains and commuter services such as the Altamont Corridor Express.
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: Union Pacific Los Angeles Subdivision
Triple: [Los Angeles–Seattle rail corridor, usesRailLine, Union Pacific Los Angeles Subdivision]

Generated description

The Union Pacific Los Angeles Subdivision is a major freight rail line in Southern California that forms a key segment of Union Pacific’s north–south mainline between Los Angeles and the Pacific Northwest.

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

Target entity: Union Pacific Los Angeles Subdivision
Target entity description: The Union Pacific Los Angeles Subdivision is a major freight rail line in Southern California that forms a key segment of Union Pacific’s north–south mainline between Los Angeles and the Pacific Northwest.

A. Union Pacific Railroad Coast Subdivision
The Union Pacific Railroad Coast Subdivision is a key rail corridor in California that carries both freight and commuter services, including trains operated by the Altamont Corridor Express.
B. Union Pacific Valley Subdivision
The Union Pacific Valley Subdivision is a railroad line operated by Union Pacific that serves as a key freight corridor within its regional rail network.
C. Union Pacific Geneva Subdivision
The Union Pacific Geneva Subdivision is a major freight rail line in the Chicago area used by Union Pacific Railroad for both mainline operations and commuter rail services.
D. Union Pacific Railroad Fresno Subdivision
The Union Pacific Railroad Fresno Subdivision is a key freight and passenger rail corridor in California’s Central Valley that carries both Union Pacific trains and Altamont Corridor Express commuter services.
E. Union Pacific Railroad Niles Subdivision
The Union Pacific Railroad Niles Subdivision is a freight and passenger rail corridor in California’s East Bay and Tri-Valley region that carries both Union Pacific trains and commuter services such as the Altamont Corridor Express.
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_69e0b4b3a6e08190ae663701f50fab8e`	completed	April 16, 2026, 10:06 a.m.
NER	Named-entity recognition	`batch_69e6a06b923c81908ba24be6645a7c61`	completed	April 20, 2026, 9:53 p.m.
NED1	Entity disambiguation (via context triple)	`batch_6a089d4a828481909085772ef81a2348`	completed	May 16, 2026, 4:37 p.m.
NEDg	Description generation	`batch_6a089e8473188190956a0817cd7bbae0`	completed	May 16, 2026, 4:42 p.m.
NED2	Entity disambiguation (via description)	`batch_6a089f04483481908fe015bd7514af35`	completed	May 16, 2026, 4:44 p.m.

Created at: April 16, 2026, 11:37 a.m.