USRA 2-6-6-2 articulated locomotive
E452576
The USRA 2-6-6-2 articulated locomotive was a standardized World War I–era American steam freight engine featuring a Mallet-type articulated wheel arrangement designed for heavy, slow freight service on steep grades and curving track.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Mallet articulated locomotives | 1 |
| USRA 2-6-6-2 articulated locomotive canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4561525 — 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 2-6-6-2 articulated locomotive Context triple: [USRA standard steam locomotive designs, hasPart, USRA 2-6-6-2 articulated locomotive]
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A.
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.
-
B.
Forney locomotive
The Forney locomotive is a compact 19th-century steam tank locomotive type, notable for its rigid wheelbase and rear-mounted fuel and water tanks, widely used on urban elevated and commuter railways.
-
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.
ACS-64 locomotives
ACS-64 locomotives are modern electric locomotives built by Siemens for Amtrak, designed for high-speed passenger service on the electrified portions of the U.S. Northeast Corridor.
-
E.
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.
- 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 2-6-6-2 articulated locomotive Target entity description: The USRA 2-6-6-2 articulated locomotive was a standardized World War I–era American steam freight engine featuring a Mallet-type articulated wheel arrangement designed for heavy, slow freight service on steep grades and curving track.
-
A.
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.
-
B.
Forney locomotive
The Forney locomotive is a compact 19th-century steam tank locomotive type, notable for its rigid wheelbase and rear-mounted fuel and water tanks, widely used on urban elevated and commuter railways.
-
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.
ACS-64 locomotives
ACS-64 locomotives are modern electric locomotives built by Siemens for Amtrak, designed for high-speed passenger service on the electrified portions of the U.S. Northeast Corridor.
-
E.
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.
- F. None of above. chosen
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf |
Mallet-type locomotive
ⓘ
USRA standard locomotive design ⓘ articulated locomotive ⓘ steam locomotive ⓘ |
| administration | United States Railroad Administration NERFINISHED ⓘ |
| articulationType | Mallet NERFINISHED ⓘ |
| boilerType | fire-tube boiler ⓘ |
| brakingSystem | air brakes ⓘ |
| category |
USRA locomotive design
NERFINISHED
ⓘ
articulated steam locomotive ⓘ freight steam locomotive ⓘ |
| configuration | articulated ⓘ |
| control | locomotive engineer ⓘ |
| controlSystem | manual valve gear ⓘ |
| countryOfOrigin |
United States of America
ⓘ
surface form:
United States
|
| designedDuring | World War I NERFINISHED ⓘ |
| designedFor |
American mainline railroads
ⓘ
curving track ⓘ heavy trains at low speed ⓘ operation on heavy grades ⓘ operation on sharp curvature ⓘ slow freight service ⓘ steep grades ⓘ |
| designer | United States Railroad Administration NERFINISHED ⓘ |
| designGoal |
high tractive effort at low speed
ⓘ
standardization across US railroads ⓘ |
| driveType | steam-powered driving wheels ⓘ |
| era | World War I era ⓘ |
| frontEngineUnit | six driving wheels ⓘ |
| fuelType | coal ⓘ |
| historicalRole | standard heavy freight locomotive design in WWI USRA era ⓘ |
| leadingWheels | two wheels ⓘ |
| powerType | steam ⓘ |
| primaryUse |
freight service
ⓘ
heavy freight service ⓘ |
| rearEngineUnit | six driving wheels ⓘ |
| serviceType |
mountain freight
ⓘ
road freight ⓘ |
| standardizationProgram | USRA standard locomotive program NERFINISHED ⓘ |
| trackAdaptation |
curves
ⓘ
steep gradients ⓘ |
| trailingWheels | two wheels ⓘ |
| wheelArrangement | 2-6-6-2 ⓘ |
| wheelArrangementNotationSystem | Whyte notation NERFINISHED ⓘ |
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 2-6-6-2 articulated locomotive Description of subject: The USRA 2-6-6-2 articulated locomotive was a standardized World War I–era American steam freight engine featuring a Mallet-type articulated wheel arrangement designed for heavy, slow freight service on steep grades and curving track.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Mallet articulated locomotives