SP 4272
E672188
SP 4272 is a Southern Pacific Railroad locomotive, specifically an AC-11 class cab-forward steam engine used for heavy freight service.
All labels observed (1)
| Label | Occurrences |
|---|---|
| SP 4272 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7429206 — 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 4272 Context triple: [AC-11, fleetNumbers, SP 4272]
-
A.
SP 4271
SP 4271 is a Southern Pacific Railroad locomotive, preserved as part of the railroad’s historic diesel-electric fleet.
-
B.
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.
-
C.
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.
-
D.
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.
-
E.
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.
- 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 4272 Target entity description: SP 4272 is a Southern Pacific Railroad locomotive, specifically an AC-11 class cab-forward steam engine used for heavy freight service.
-
A.
SP 4271
SP 4271 is a Southern Pacific Railroad locomotive, preserved as part of the railroad’s historic diesel-electric fleet.
-
B.
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.
-
C.
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.
-
D.
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.
-
E.
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.
- F. None of above. chosen
Statements (28)
| Predicate | Object |
|---|---|
| instanceOf |
Southern Pacific locomotive
ⓘ
steam locomotive ⓘ |
| belongsToClass |
Southern Pacific AC-11 class
ⓘ
linked to:
Southern Pacific AC-11
|
| brakeType | air brakes (probable) ⓘ |
| category |
Southern Pacific AC-11 locomotives
ⓘ
linked to:
Southern Pacific Cab Forward locomotive
|
| class | AC-11 ⓘ |
| configuration | cab-forward ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| coupling |
Janney (AAR) coupler (probable)
ⓘ
linked to:
Janney coupler
|
| designFamily |
Southern Pacific AC cab-forward series
ⓘ
linked to:
Southern Pacific Cab Forward locomotive
|
| era | steam era ⓘ |
| fuelType | likely fuel oil ⓘ |
| gauge | standard gauge ⓘ |
| notableFeature |
cab located at front of locomotive
ⓘ
designed for mountain grades and tunnels ⓘ |
| operator | Southern Pacific Railroad ⓘ |
| powerType | steam ⓘ |
| primaryRole | road freight locomotive ⓘ |
| railwayCompany | Southern Pacific Railroad ⓘ |
| railwayNetwork |
Southern Pacific Railroad network
ⓘ
linked to:
Southern Pacific Railroad
|
| railwayRegion |
California (probable)
ⓘ
linked to:
California, United States
Sierra Nevada routes (probable) ⓘ Western United States ⓘ
linked to:
western United States
|
| serviceType | mainline freight ⓘ |
| status | historical locomotive ⓘ |
| traction | steam-driven driving wheels ⓘ |
| use |
freight service
ⓘ
heavy freight service ⓘ |
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 4272 Description of subject: SP 4272 is a Southern Pacific Railroad locomotive, specifically an AC-11 class cab-forward steam engine used for heavy freight service.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.