SP 4249
E667145
SP 4249 is a Southern Pacific Railroad AC-11 class articulated steam locomotive, part of the railroad’s famous cab-forward fleet used primarily in heavy freight service.
All labels observed (1)
| Label | Occurrences |
|---|---|
| SP 4249 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7429183 — 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: SP 4249 Context triple: [AC-11, fleetNumbers, SP 4249]
-
A.
SP 4247
SP 4247 is a Southern Pacific Railroad AC-11 class articulated steam locomotive, part of the railroad’s well-known cab-forward fleet used primarily in heavy freight service.
-
B.
SP 4245
SP 4245 is a Southern Pacific Railroad EMD AC-11 class articulated steam locomotive, part of a series of powerful cab-forward engines used primarily for heavy freight service over mountainous routes.
-
C.
SP 4260
SP 4260 is a preserved Southern Pacific Railroad steam locomotive, notable as one of the surviving examples of the railroad’s AC-11 class articulated cab-forward engines.
-
D.
SP 4263
SP 4263 is a Southern Pacific Railroad AC-11 class articulated steam locomotive, part of the railroad’s famous cab-forward fleet used primarily in heavy freight service.
-
E.
SP 4250
SP 4250 is a Southern Pacific Railroad AC-11 class articulated steam locomotive, part of the railroad’s famous cab-forward fleet used primarily for heavy freight service.
- 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: SP 4249 Target entity description: SP 4249 is a Southern Pacific Railroad AC-11 class articulated steam locomotive, part of the railroad’s famous cab-forward fleet used primarily in heavy freight service.
-
A.
SP 4247
SP 4247 is a Southern Pacific Railroad AC-11 class articulated steam locomotive, part of the railroad’s well-known cab-forward fleet used primarily in heavy freight service.
-
B.
SP 4245
SP 4245 is a Southern Pacific Railroad EMD AC-11 class articulated steam locomotive, part of a series of powerful cab-forward engines used primarily for heavy freight service over mountainous routes.
-
C.
SP 4260
SP 4260 is a preserved Southern Pacific Railroad steam locomotive, notable as one of the surviving examples of the railroad’s AC-11 class articulated cab-forward engines.
-
D.
SP 4263
SP 4263 is a Southern Pacific Railroad AC-11 class articulated steam locomotive, part of the railroad’s famous cab-forward fleet used primarily in heavy freight service.
-
E.
SP 4250
SP 4250 is a Southern Pacific Railroad AC-11 class articulated steam locomotive, part of the railroad’s famous cab-forward fleet used primarily for heavy freight service.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
Southern Pacific AC-11 steam locomotive
ⓘ
articulated steam locomotive ⓘ |
| builder | Baldwin Locomotive Works NERFINISHED ⓘ |
| category |
4-8-8-2 locomotives
ⓘ
Southern Pacific Railroad locomotives ⓘ articulated locomotives ⓘ steam locomotives of the United States ⓘ |
| class | Southern Pacific AC-11 NERFINISHED ⓘ |
| configuration | 4-8-8-2 ⓘ |
| countryOfOperation |
United States of America
ⓘ
surface form:
United States
|
| designedFor | long mountain tunnels and snow sheds ⓘ |
| family | Southern Pacific AC-class cab-forwards NERFINISHED ⓘ |
| fuelType | bunker oil ⓘ |
| gauge |
4 ft 8 1⁄2 in
ⓘ
standard gauge ⓘ |
| hasWheelArrangement | 4-8-8-2 Mallet-type ⓘ |
| notableFeature |
articulated frame
ⓘ
cab-forward design ⓘ |
| numberInClass | AC-11 ⓘ |
| operator | Southern Pacific Railroad NERFINISHED ⓘ |
| powerType | steam ⓘ |
| primaryUse |
heavy freight service
ⓘ
mountain freight service ⓘ |
| railroad | Southern Pacific NERFINISHED ⓘ |
| railwayCompanyFleet | Southern Pacific cab-forward fleet NERFINISHED ⓘ |
| railwayLineUsedOn | Southern Pacific Railroad NERFINISHED ⓘ |
| railwayOwner | Southern Pacific Railroad NERFINISHED ⓘ |
| regionOfOperation | U.S. West Coast NERFINISHED ⓘ |
| traction | adhesion ⓘ |
| UICClassification | (2′D)D2′ h4 ⓘ |
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: SP 4249 Description of subject: SP 4249 is a Southern Pacific Railroad AC-11 class articulated steam locomotive, part of the railroad’s famous cab-forward fleet used primarily in heavy freight service.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.