SP 4250
E662830
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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| SP 4250 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7429184 — 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 4250 Context triple: [AC-11, fleetNumbers, SP 4250]
-
A.
S-44
S-44 is an International Hydrographic Organization standard that defines the accuracy and quality requirements for hydrographic surveys used in nautical charting and marine navigation.
-
B.
4.25 SC
4.25 SC is a prominent North Korean football club based in Pyongyang, historically one of the country’s most successful and influential teams.
-
C.
S-220
S-220 is the hull number of NOAA Ship Fairweather, a National Oceanic and Atmospheric Administration vessel primarily used for hydrographic surveying and seafloor mapping.
-
D.
SP4 Robert F. Stryker
SP4 Robert F. Stryker was a United States Army soldier and Medal of Honor recipient from the Vietnam War, honored posthumously for his extraordinary heroism in combat.
-
E.
SP1500
SP1500 is the stock market ticker symbol for the S&P Composite 1500 Index, a broad U.S. equity benchmark that combines large-, mid-, and small-cap stocks.
- 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 4250 Target entity description: 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.
-
A.
S-44
S-44 is an International Hydrographic Organization standard that defines the accuracy and quality requirements for hydrographic surveys used in nautical charting and marine navigation.
-
B.
4.25 SC
4.25 SC is a prominent North Korean football club based in Pyongyang, historically one of the country’s most successful and influential teams.
-
C.
S-220
S-220 is the hull number of NOAA Ship Fairweather, a National Oceanic and Atmospheric Administration vessel primarily used for hydrographic surveying and seafloor mapping.
-
D.
SP4 Robert F. Stryker
SP4 Robert F. Stryker was a United States Army soldier and Medal of Honor recipient from the Vietnam War, honored posthumously for his extraordinary heroism in combat.
-
E.
SP1500
SP1500 is the stock market ticker symbol for the S&P Composite 1500 Index, a broad U.S. equity benchmark that combines large-, mid-, and small-cap stocks.
- F. None of above. chosen
Statements (43)
| Predicate | Object |
|---|---|
| instanceOf |
Southern Pacific AC-11 steam locomotive
ⓘ
articulated steam locomotive ⓘ cab-forward locomotive ⓘ |
| belongsToFleet | Southern Pacific cab-forward fleet NERFINISHED ⓘ |
| brakeType | air brakes ⓘ |
| builder | Baldwin Locomotive Works NERFINISHED ⓘ |
| configuration | 4-8-8-2 ⓘ |
| countryOfOperation |
United States of America
ⓘ
surface form:
United States
|
| designedToMitigate | smoke in locomotive cab in tunnels and snow sheds ⓘ |
| designFeature |
Mallet-type articulation
ⓘ
articulated frame ⓘ cab-forward layout ⓘ |
| era | steam era ⓘ |
| fleetOrClass | Southern Pacific AC-11 class NERFINISHED ⓘ |
| fuelType | bunker oil ⓘ |
| gauge |
4 ft 8 1⁄2 in
ⓘ
standard gauge ⓘ |
| hasArticulation | two engine units under one boiler ⓘ |
| hasCabLocation | front of locomotive ⓘ |
| hasUICClassification | (2′D)D2′ ⓘ |
| heritage | North American mainline steam locomotive ⓘ |
| locomotiveType | freight steam locomotive ⓘ |
| notableFor | being part of Southern Pacific’s famous cab-forward locomotives ⓘ |
| numberInClass | AC-11 series road number 4250 ⓘ |
| operator | Southern Pacific Railroad NERFINISHED ⓘ |
| powerType | steam ⓘ |
| primaryUse |
heavy freight service
ⓘ
mountain grade freight service ⓘ |
| railwayCompany | Southern Pacific NERFINISHED ⓘ |
| railwayLineUsedOn |
Southern Pacific Cascade Line
NERFINISHED
ⓘ
Southern Pacific Donner Pass route NERFINISHED ⓘ Southern Pacific Overland Route NERFINISHED ⓘ |
| railwayOwner | Southern Pacific Company NERFINISHED ⓘ |
| railwayRegion |
Cascade Range
NERFINISHED
ⓘ
Sierra Nevada NERFINISHED ⓘ U.S. West Coast NERFINISHED ⓘ |
| railwaySystem | Southern Pacific steam locomotive roster ⓘ |
| railwayTrafficRole | road freight locomotive ⓘ |
| smokeboxLocation | rear of locomotive ⓘ |
| trackGaugeCategory | standard-gauge railway locomotive ⓘ |
| tractionType | adhesion ⓘ |
| usedFor |
heavy tonnage over steep grades
ⓘ
long-haul freight trains ⓘ |
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 4250 Description of subject: 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.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.