Union Pacific–Central Pacific rail connection
E721095
The Union Pacific–Central Pacific rail connection was the historic junction point in Utah where the first U.S. transcontinental railroad was completed in 1869, linking eastern and western rail networks.
All labels observed (5)
How this entity was disambiguated
This entity first appeared as the object of triple T8255350 — 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: Union Pacific–Central Pacific rail connection Context triple: [Golden Spike Ceremony, associatedWith, Union Pacific–Central Pacific rail connection]
-
A.
Union Pacific Railroad line
The Union Pacific Railroad line is a major freight rail route in the western United States operated by Union Pacific Railroad, one of the largest railroad networks in North America.
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B.
Union Pacific West Line
The Union Pacific West Line is a commuter rail route in the Chicago metropolitan area that runs between downtown Chicago and western suburbs, providing daily passenger service as part of the Metra system.
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C.
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.
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D.
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.
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E.
Union Pacific Railroad Tracy Subdivision
The Union Pacific Railroad Tracy Subdivision is a freight and passenger rail line in California’s Central Valley and Altamont Pass area that serves as a key route for both Union Pacific operations and commuter services like the Altamont Corridor Express.
- 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: Union Pacific–Central Pacific rail connection Target entity description: The Union Pacific–Central Pacific rail connection was the historic junction point in Utah where the first U.S. transcontinental railroad was completed in 1869, linking eastern and western rail networks.
-
A.
Union Pacific Railroad line
The Union Pacific Railroad line is a major freight rail route in the western United States operated by Union Pacific Railroad, one of the largest railroad networks in North America.
-
B.
Union Pacific West Line
The Union Pacific West Line is a commuter rail route in the Chicago metropolitan area that runs between downtown Chicago and western suburbs, providing daily passenger service as part of the Metra system.
-
C.
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.
-
D.
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.
-
E.
Union Pacific Railroad Tracy Subdivision
The Union Pacific Railroad Tracy Subdivision is a freight and passenger rail line in California’s Central Valley and Altamont Pass area that serves as a key route for both Union Pacific operations and commuter services like the Altamont Corridor Express.
- F. None of above. chosen
Statements (36)
| Predicate | Object |
|---|---|
| instanceOf |
historic site
ⓘ
rail junction ⓘ |
| alsoKnownAs |
Golden Spike junction
ⓘ
linked to:
Promontory Summit rail junction
Junction of the Union Pacific and Central Pacific Railroads ⓘ |
| category |
Historic transportation sites in the United States
ⓘ
Rail infrastructure in Utah ⓘ Transcontinental railways in the United States ⓘ |
| ceremony | Golden Spike ceremony ⓘ |
| commemoratedBy | Golden Spike National Historical Park ⓘ |
| connectsWith |
Central Pacific Railroad
ⓘ
Union Pacific Railroad ⓘ |
| constructionAuthorizedBy |
Pacific Railroad Act of 1862
ⓘ
linked to:
Union Pacific Railway Act of 1862
|
| country |
United States
ⓘ
linked to:
United States of America
|
| dateCompleted | 1869-05-10 ⓘ |
| distanceFromSaltLakeCity | approximately 66 miles northwest ⓘ |
| event | completion of the first U.S. transcontinental railroad ⓘ |
| hasReplicaFeature |
replica golden spike at the site
ⓘ
replica locomotives Jupiter and No. 119 at the site ⓘ |
| historicalEra | 19th century ⓘ |
| impact |
accelerated settlement and economic development of the American West
ⓘ
facilitated coast-to-coast freight and passenger service in the United States ⓘ |
| linkedRegion |
eastern United States rail network
ⓘ
western United States rail network ⓘ |
| locatedIn |
Box Elder County, Utah
ⓘ
Promontory Summit ⓘ
linked to:
Promontory Summit, Utah Territory
Utah ⓘ |
| openedToTraffic | 1869-05-10 ⓘ |
| partOf | First Transcontinental Railroad ⓘ |
| previouslyCommemoratedBy |
Golden Spike National Historic Site
ⓘ
linked to:
Golden Spike National Historical Park
|
| railGauge | standard gauge ⓘ |
| railroadCompanyOnEast | Union Pacific Railroad ⓘ |
| railroadCompanyOnWest | Central Pacific Railroad ⓘ |
| significance |
completed continuous rail service between the Atlantic and Pacific coasts
ⓘ
reduced cross-country travel time in the United States from months to about a week ⓘ |
| transportMode | rail transport ⓘ |
| yearCompleted | 1869 ⓘ |
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: Union Pacific–Central Pacific rail connection Description of subject: The Union Pacific–Central Pacific rail connection was the historic junction point in Utah where the first U.S. transcontinental railroad was completed in 1869, linking eastern and western rail networks.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
golden spike ceremony
Big Four of the Central Pacific
→
associatedWith
→
Union Pacific–Central Pacific railroad connection at Promontory Summit
ⓘ
linked to: Union Pacific–Central Pacific rail connection
Central Pacific line from Sacramento, California
→
connectedTo
→
Union Pacific main line at Promontory Summit
ⓘ
linked to: Union Pacific–Central Pacific rail connection
linked to: Union Pacific–Central Pacific rail connection
Union Pacific–Central Pacific rail connection
→
alsoKnownAs
→
Junction of the Union Pacific and Central Pacific Railroads
ⓘ
linked to: Union Pacific–Central Pacific rail connection