Triple

T508774

Position	Surface form	Disambiguated ID	Type / Status
Subject	Philadelphia, Wilmington and Baltimore Railroad	`E10558`	entity
Predicate	notableStructure	`P1544`	FINISHED
Object	Susquehanna River bridge at Havre de Grace The Susquehanna River bridge at Havre de Grace is a historic railroad crossing over the Susquehanna River in Maryland that played a key role in 19th-century rail travel along the Northeast Corridor.	`E94439`	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: Susquehanna River bridge at Havre de Grace | Statement: [Philadelphia, Wilmington and Baltimore Railroad, notableStructure, Susquehanna River bridge at Havre de Grace]

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

Target entity: Susquehanna River bridge at Havre de Grace
Context triple: [Philadelphia, Wilmington and Baltimore Railroad, notableStructure, Susquehanna River bridge at Havre de Grace]

A. Mystic River Bridge
The Mystic River Bridge, officially known as the Maurice J. Tobin Memorial Bridge, is a major steel cantilever roadway bridge in Boston, Massachusetts, carrying U.S. Route 1 over the Mystic River between Charlestown and Chelsea.
B. Sagamore Bridge
Sagamore Bridge is a major highway bridge in Massachusetts that carries traffic over the Cape Cod Canal, serving as one of the primary gateways to Cape Cod.
C. Panhandle Bridge at Pittsburgh
The Panhandle Bridge at Pittsburgh is a historic railroad bridge over the Monongahela River that once carried major Pennsylvania Railroad and successor passenger trains into downtown Pittsburgh.
D. Longfellow Bridge
Longfellow Bridge is a historic steel and granite bridge in Boston, Massachusetts, known for carrying road and rail traffic between Boston and Cambridge across the Charles River.
E. Grenville Dodge Memorial Bridge
The Grenville Dodge Memorial Bridge is a major highway bridge in the Omaha–Council Bluffs area that carries Interstate 480 across the Missouri River between Nebraska and Iowa.
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: Susquehanna River bridge at Havre de Grace
Triple: [Philadelphia, Wilmington and Baltimore Railroad, notableStructure, Susquehanna River bridge at Havre de Grace]

Generated description

The Susquehanna River bridge at Havre de Grace is a historic railroad crossing over the Susquehanna River in Maryland that played a key role in 19th-century rail travel along the Northeast Corridor.

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

Target entity: Susquehanna River bridge at Havre de Grace
Target entity description: The Susquehanna River bridge at Havre de Grace is a historic railroad crossing over the Susquehanna River in Maryland that played a key role in 19th-century rail travel along the Northeast Corridor.

A. Mystic River Bridge
The Mystic River Bridge, officially known as the Maurice J. Tobin Memorial Bridge, is a major steel cantilever roadway bridge in Boston, Massachusetts, carrying U.S. Route 1 over the Mystic River between Charlestown and Chelsea.
B. Sagamore Bridge
Sagamore Bridge is a major highway bridge in Massachusetts that carries traffic over the Cape Cod Canal, serving as one of the primary gateways to Cape Cod.
C. Panhandle Bridge at Pittsburgh
The Panhandle Bridge at Pittsburgh is a historic railroad bridge over the Monongahela River that once carried major Pennsylvania Railroad and successor passenger trains into downtown Pittsburgh.
D. Longfellow Bridge
Longfellow Bridge is a historic steel and granite bridge in Boston, Massachusetts, known for carrying road and rail traffic between Boston and Cambridge across the Charles River.
E. Grenville Dodge Memorial Bridge
The Grenville Dodge Memorial Bridge is a major highway bridge in the Omaha–Council Bluffs area that carries Interstate 480 across the Missouri River between Nebraska and Iowa.
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_69a2e848adf881908e5e04f7af030093`	completed	Feb. 28, 2026, 1:06 p.m.
NER	Named-entity recognition	`batch_69a2f162f3888190b057ad04e40a30e2`	completed	Feb. 28, 2026, 1:45 p.m.
NED1	Entity disambiguation (via context triple)	`batch_69a67eec3dfc8190bacde41a21cbf219`	completed	March 3, 2026, 6:25 a.m.
NEDg	Description generation	`batch_69a67f6615188190ad526ba0875209a9`	completed	March 3, 2026, 6:27 a.m.
NED2	Entity disambiguation (via description)	`batch_69a6808069e08190bc6df238c91d24c4`	completed	March 3, 2026, 6:32 a.m.

Created at: Feb. 28, 2026, 1:12 p.m.