AAR
E20202
AAR is the American Association of Railroads' wheel arrangement classification system commonly used to describe locomotive axle configurations in North America.
All labels observed (2)
| Label | Occurrences |
|---|---|
| A1A-A1A means two trucks each with an outer powered axle, one idle axle, and an outer powered axle | 1 |
| AAR canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T164999 — 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: AAR Context triple: [GG1 electric locomotive, wheelArrangementSystem, AAR]
-
A.
AA
AA is the two-letter IATA airline designator used to identify American Airlines in flight schedules, tickets, and aviation systems.
-
B.
AAS
AAS is a major professional organization dedicated to the advancement of astronomy and related sciences in the United States.
-
C.
AAS
AAS is a pan-African scientific organization that promotes excellence in science, technology, and innovation to drive sustainable development across the African continent.
-
D.
AAL
AAL is the ICAO airline designator used in aviation to identify American Airlines in flight operations and air traffic control.
-
E.
AAA
AAA was a New Deal-era U.S. government agency created to regulate agricultural production and stabilize farm prices during the Great Depression.
- 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: AAR Target entity description: AAR is the American Association of Railroads' wheel arrangement classification system commonly used to describe locomotive axle configurations in North America.
-
A.
AA
AA is the two-letter IATA airline designator used to identify American Airlines in flight schedules, tickets, and aviation systems.
-
B.
AAS
AAS is a major professional organization dedicated to the advancement of astronomy and related sciences in the United States.
-
C.
AAS
AAS is a pan-African scientific organization that promotes excellence in science, technology, and innovation to drive sustainable development across the African continent.
-
D.
AAL
AAL is the ICAO airline designator used in aviation to identify American Airlines in flight operations and air traffic control.
-
E.
AAA
AAA was a New Deal-era U.S. government agency created to regulate agricultural production and stabilize farm prices during the Great Depression.
- F. None of above. chosen
Statements (37)
| Predicate | Object |
|---|---|
| instanceOf |
locomotive axle configuration notation
ⓘ
wheel arrangement classification system ⓘ |
| basedOn | count of powered and unpowered axles in each truck ⓘ |
| classificationGranularity | axle-level rather than wheel-level ⓘ |
| comparedWith |
UIC wheel arrangement classification
ⓘ
Whyte notation ⓘ |
| domain |
locomotive design
ⓘ
railway engineering ⓘ |
| exampleNotation |
A1A-A1A
ⓘ
B-1-B ⓘ B-B ⓘ B-B-B ⓘ C-C ⓘ |
| fullName | American Association of Railroads wheel arrangement classification system ⓘ |
| hasConcept |
powered axle
ⓘ
truck (bogie) as a grouping of axles ⓘ unpowered axle ⓘ |
| interprets |
AAR
self-linksurface differs
ⓘ
surface form:
A1A-A1A means two trucks each with an outer powered axle, one idle axle, and an outer powered axle
B-1-B means two two-axle powered trucks separated by a single unpowered axle ⓘ B-B means two trucks each with two powered axles ⓘ C-C means two trucks each with three powered axles ⓘ |
| notationFeature |
uses hyphens to separate trucks or groups of axles
ⓘ
uses letters to denote powered axles ⓘ uses numbers to denote unpowered axles ⓘ |
| notUsedFor | detailed steam locomotive wheel arrangements ⓘ |
| primaryUsers |
North American rail network
ⓘ
surface form:
North American freight railroads
North American rail network ⓘ
surface form:
North American passenger railroads
|
| relatedTo | Association of American Railroads ⓘ |
| scope |
multiple-unit rail vehicles
ⓘ
primarily diesel and electric locomotives ⓘ |
| standardizedBy | Association of American Railroads ⓘ |
| usedBy |
locomotive manufacturers
ⓘ
railroad industry ⓘ railroad operators ⓘ |
| usedFor |
classifying wheel arrangements of locomotives
ⓘ
describing locomotive axle configurations ⓘ |
| usedInRegion | North America ⓘ |
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: AAR Description of subject: AAR is the American Association of Railroads' wheel arrangement classification system commonly used to describe locomotive axle configurations in North America.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
A1A-A1A means two trucks each with an outer powered axle, one idle axle, and an outer powered axle