AAR
E20202
AAR is the American Association of Railroads' wheel arrangement classification system commonly used to describe locomotive axle configurations in North America.
Observed surface forms (1)
| Surface form | Occurrences |
|---|---|
| A1A-A1A means two trucks each with an outer powered axle, one idle axle, and an outer powered axle | 1 |
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 ⓘ |
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