SP 4258
E670063
SP 4258 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 4258 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7429192 — 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 4258 Context triple: [AC-11, fleetNumbers, SP 4258]
-
A.
SP 4257
SP 4257 is a preserved Southern Pacific AC-11 class articulated steam locomotive, notable as one of the railroad’s powerful cab-forward engines used in heavy freight service.
-
B.
SP 4268
SP 4268 is a preserved Southern Pacific Railroad EMD E-unit diesel locomotive, often featured in heritage and excursion service.
-
C.
SP 4249
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.
-
D.
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.
-
E.
SP 4267
SP 4267 is a preserved Southern Pacific AC-11 class articulated steam locomotive, notable as one of the railroad’s powerful cab-forward engines used in 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 4258 Target entity description: SP 4258 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 4257
SP 4257 is a preserved Southern Pacific AC-11 class articulated steam locomotive, notable as one of the railroad’s powerful cab-forward engines used in heavy freight service.
-
B.
SP 4268
SP 4268 is a preserved Southern Pacific Railroad EMD E-unit diesel locomotive, often featured in heritage and excursion service.
-
C.
SP 4249
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.
-
D.
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.
-
E.
SP 4267
SP 4267 is a preserved Southern Pacific AC-11 class articulated steam locomotive, notable as one of the railroad’s powerful cab-forward engines used in heavy freight service.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
Southern Pacific AC-11
ⓘ
steam locomotive ⓘ |
| articulationType | Mallet-type articulated ⓘ |
| belongsToSeries | Southern Pacific AC-11 class NERFINISHED ⓘ |
| builder | Baldwin Locomotive Works NERFINISHED ⓘ |
| class | AC-11 ⓘ |
| configuration | 4-8-8-2 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| designFeature | cab-forward layout ⓘ |
| fleet | Southern Pacific cab-forward locomotives NERFINISHED ⓘ |
| fuelType | bunker oil ⓘ |
| gauge | standard gauge ⓘ |
| hasCabLocation | front of locomotive ⓘ |
| isPartOf | Southern Pacific locomotive roster ⓘ |
| locomotiveType | cab-forward steam locomotive ⓘ |
| numberInClass | 4258 ⓘ |
| operator | Southern Pacific Railroad NERFINISHED ⓘ |
| powerType | steam ⓘ |
| primaryUse |
freight service
ⓘ
heavy freight service ⓘ |
| railroad | Southern Pacific NERFINISHED ⓘ |
| railroadClass | AC-11 ⓘ |
| railwayCompany | Southern Pacific Transportation Company NERFINISHED ⓘ |
| regionServed |
United States of America
ⓘ
surface form:
United States
|
| serviceType | road freight ⓘ |
| trackGauge | 1,435 mm ⓘ |
| traction | adhesion ⓘ |
| UICClassification | (2′D)D2′ h4 ⓘ |
| usedBy | Southern Pacific Railroad NERFINISHED ⓘ |
| whyteType | 4-8-8-2 ⓘ |
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: SP 4258 Description of subject: SP 4258 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.