USRA Light Pacific 4-6-2
E452573
The USRA Light Pacific 4-6-2 was a widely used American passenger steam locomotive type developed under the United States Railroad Administration during World War I, known for its balanced performance and standardized design.
All labels observed (1)
| Label | Occurrences |
|---|---|
| USRA Light Pacific 4-6-2 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4561515 — 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: USRA Light Pacific 4-6-2 Context triple: [USRA standard steam locomotive designs, hasPart, USRA Light Pacific 4-6-2]
-
A.
WM Class I-2 2-10-0
WM Class I-2 2-10-0 was a powerful Decapod-type steam locomotive class used by the Western Maryland Railway primarily for heavy freight service over steep grades.
-
B.
Standard Passenger Pacific of the PRR
The "Standard Passenger Pacific of the PRR" refers to the Pennsylvania Railroad’s K4s class, a highly successful and iconic 4-6-2 steam locomotive that became the railroad’s primary passenger engine in the early to mid-20th century.
-
C.
Union Pacific Challenger
The Union Pacific Challenger was a named passenger train operated by the Union Pacific Railroad, known for providing comfortable, mid-priced long-distance service across the western United States.
-
D.
Union Pacific No. 119
Union Pacific No. 119 was the steam locomotive that represented the Union Pacific Railroad at the 1869 Golden Spike ceremony marking the completion of the First Transcontinental Railroad.
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E.
Atchison Topeka and Santa Fe 4-8-4 locomotive
The Atchison, Topeka and Santa Fe 4-8-4 locomotive is a powerful steam engine from the famed Santa Fe Railway, known for hauling high-speed passenger and heavy freight trains across the American West in the mid-20th century.
- 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: USRA Light Pacific 4-6-2 Target entity description: The USRA Light Pacific 4-6-2 was a widely used American passenger steam locomotive type developed under the United States Railroad Administration during World War I, known for its balanced performance and standardized design.
-
A.
WM Class I-2 2-10-0
WM Class I-2 2-10-0 was a powerful Decapod-type steam locomotive class used by the Western Maryland Railway primarily for heavy freight service over steep grades.
-
B.
Standard Passenger Pacific of the PRR
The "Standard Passenger Pacific of the PRR" refers to the Pennsylvania Railroad’s K4s class, a highly successful and iconic 4-6-2 steam locomotive that became the railroad’s primary passenger engine in the early to mid-20th century.
-
C.
Union Pacific Challenger
The Union Pacific Challenger was a named passenger train operated by the Union Pacific Railroad, known for providing comfortable, mid-priced long-distance service across the western United States.
-
D.
Union Pacific No. 119
Union Pacific No. 119 was the steam locomotive that represented the Union Pacific Railroad at the 1869 Golden Spike ceremony marking the completion of the First Transcontinental Railroad.
-
E.
Atchison Topeka and Santa Fe 4-8-4 locomotive
The Atchison, Topeka and Santa Fe 4-8-4 locomotive is a powerful steam engine from the famed Santa Fe Railway, known for hauling high-speed passenger and heavy freight trains across the American West in the mid-20th century.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
4-6-2 Pacific type locomotive
ⓘ
USRA standard locomotive design ⓘ steam locomotive class ⓘ |
| administrationPeriod | Federal control of US railroads 1917–1920 ⓘ |
| associatedWith |
USRA standardization program
ⓘ
federal control of US railroads ⓘ |
| category |
United States steam locomotives
ⓘ
passenger steam locomotives ⓘ standard steam locomotive design ⓘ |
| classificationSystem | Whyte notation NERFINISHED ⓘ |
| countryOfOrigin |
United States of America
ⓘ
surface form:
United States
|
| designedFor | multiple American railroads ⓘ |
| designEmphasis | good speed and adequate power on lighter track ⓘ |
| designFamily |
USRA Light locomotive designs
NERFINISHED
ⓘ
USRA Pacific types NERFINISHED ⓘ |
| designGoal |
balanced performance
ⓘ
interchangeability of parts ⓘ standardization ⓘ |
| designRationale |
improve efficiency of locomotive production
ⓘ
simplify wartime locomotive procurement ⓘ |
| developedBy | United States Railroad Administration NERFINISHED ⓘ |
| era | World War I NERFINISHED ⓘ |
| geographicScope | North American rail network NERFINISHED ⓘ |
| historicalSignificance | one of the most widely used USRA passenger locomotive types ⓘ |
| influenced | subsequent railroad-specific Pacific designs ⓘ |
| introducedBy | United States Railroad Administration NERFINISHED ⓘ |
| introducedDuring | World War I NERFINISHED ⓘ |
| introducedInDecade | 1910s ⓘ |
| locomotiveType | tender locomotive ⓘ |
| nameOrigin | Pacific type from 4-6-2 wheel arrangement ⓘ |
| notableFeature |
relatively light axle loading
ⓘ
standardized boiler and running gear ⓘ suitability for lighter track ⓘ |
| operatorType | Class I railroads in the United States ⓘ |
| powerType | steam ⓘ |
| primaryUse | passenger service ⓘ |
| regulator | United States Railroad Administration NERFINISHED ⓘ |
| roleInHistory | helped meet wartime passenger transport demands ⓘ |
| serviceType |
mainline passenger
ⓘ
mixed-traffic in some cases ⓘ |
| standardizedBy | United States Railroad Administration NERFINISHED ⓘ |
| timePeriod | early 20th century ⓘ |
| traction | steam-driven driving wheels ⓘ |
| UICClassification | 2′C1′ ⓘ |
| usedFor |
commuter passenger trains
ⓘ
intercity passenger trains ⓘ |
| wheelArrangement | 4-6-2 ⓘ |
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: USRA Light Pacific 4-6-2 Description of subject: The USRA Light Pacific 4-6-2 was a widely used American passenger steam locomotive type developed under the United States Railroad Administration during World War I, known for its balanced performance and standardized design.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.