EMD GP9 locomotive
E506012
The EMD GP9 locomotive is a widely used four-axle diesel-electric road switcher built in the 1950s that became one of North America's most successful and versatile freight and passenger locomotives.
All labels observed (1)
| Label | Occurrences |
|---|---|
| EMD GP9 locomotive canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5178065 — 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: EMD GP9 locomotive Context triple: [Electro-Motive Division, notableProduct, EMD GP9 locomotive]
-
A.
EMD GP7 locomotive
The EMD GP7 locomotive is a widely used four-axle diesel-electric road switcher introduced in the late 1940s that helped usher in the transition from steam to diesel power on North American railroads.
-
B.
EMD FT locomotive
The EMD FT locomotive is a pioneering diesel-electric freight locomotive introduced in the late 1930s that helped establish Electro-Motive Division as a leader in replacing steam power on American railroads.
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C.
EMD GP40-2H
The EMD GP40-2H is a rebuilt, passenger-equipped variant of the EMD GP40-2 diesel-electric locomotive, featuring head-end power for commuter rail service.
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D.
EMD F40PH
The EMD F40PH is a widely used four-axle diesel-electric passenger locomotive built by Electro-Motive Division, best known for its long service on North American commuter and intercity railroads.
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E.
EMD F59PHI
The EMD F59PHI is a streamlined diesel-electric passenger locomotive widely used in North American intercity and commuter rail services.
- 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: EMD GP9 locomotive Target entity description: The EMD GP9 locomotive is a widely used four-axle diesel-electric road switcher built in the 1950s that became one of North America's most successful and versatile freight and passenger locomotives.
-
A.
EMD GP7 locomotive
The EMD GP7 locomotive is a widely used four-axle diesel-electric road switcher introduced in the late 1940s that helped usher in the transition from steam to diesel power on North American railroads.
-
B.
EMD FT locomotive
The EMD FT locomotive is a pioneering diesel-electric freight locomotive introduced in the late 1930s that helped establish Electro-Motive Division as a leader in replacing steam power on American railroads.
-
C.
EMD GP40-2H
The EMD GP40-2H is a rebuilt, passenger-equipped variant of the EMD GP40-2 diesel-electric locomotive, featuring head-end power for commuter rail service.
-
D.
EMD F40PH
The EMD F40PH is a widely used four-axle diesel-electric passenger locomotive built by Electro-Motive Division, best known for its long service on North American commuter and intercity railroads.
-
E.
EMD F59PHI
The EMD F59PHI is a streamlined diesel-electric passenger locomotive widely used in North American intercity and commuter rail services.
- F. None of above. chosen
Statements (54)
| Predicate | Object |
|---|---|
| instanceOf |
diesel-electric locomotive
ⓘ
locomotive model ⓘ road switcher ⓘ |
| axleConfiguration | four-axle ⓘ |
| brakeType | air brakes ⓘ |
| buildEndDate | 1963 ⓘ |
| buildStartDate | 1954 ⓘ |
| controlType | multiple-unit control capable ⓘ |
| cylinderCount | 16 ⓘ |
| designedFor |
freight service
ⓘ
passenger service ⓘ road switching ⓘ |
| engineConfiguration | V16 ⓘ |
| fuelType | diesel fuel ⓘ |
| heritageUnits | preserved in museums and tourist railroads ⓘ |
| introducedAs | successor to the EMD GP7 with higher horsepower ⓘ |
| length | about 56 ft ⓘ |
| manufacturer |
Electro-Motive Division
NERFINISHED
ⓘ
General Motors Electro-Motive Division NERFINISHED ⓘ |
| notableFor |
long service life
ⓘ
versatility in freight and passenger service ⓘ widespread use by Class I railroads ⓘ |
| operatedInCountry |
Canada
NERFINISHED
ⓘ
United States NERFINISHED ⓘ |
| operatedInRegion | North America NERFINISHED ⓘ |
| powerOutput | 1750 hp ⓘ |
| powerType | diesel-electric ⓘ |
| predecessor | EMD GP7 NERFINISHED ⓘ |
| primeMover | EMD 567C NERFINISHED ⓘ |
| productionTotal | over 4000 units ⓘ |
| serviceEntryDecade | 1950s ⓘ |
| successor | EMD GP18 NERFINISHED ⓘ |
| typicalUse |
branch line freight
ⓘ
commuter passenger trains ⓘ local switching ⓘ mainline freight ⓘ |
| UICClassification | Bo′Bo′ ⓘ |
| usedBy |
Atchison, Topeka and Santa Fe Railway
NERFINISHED
ⓘ
Baltimore and Ohio Railroad NERFINISHED ⓘ Boston and Maine Railroad NERFINISHED ⓘ Canadian National Railway NERFINISHED ⓘ Canadian Pacific Railway NERFINISHED ⓘ Canadian Pacific subsidiary railways ⓘ Chicago, Burlington and Quincy Railroad NERFINISHED ⓘ Denver and Rio Grande Western Railroad NERFINISHED ⓘ Great Northern Railway (U.S.) NERFINISHED ⓘ Illinois Central Railroad NERFINISHED ⓘ Milwaukee Road NERFINISHED ⓘ Norfolk and Western Railway NERFINISHED ⓘ Pennsylvania Railroad NERFINISHED ⓘ Southern Pacific Railroad NERFINISHED ⓘ Southern Railway (U.S.) NERFINISHED ⓘ Union Pacific Railroad NERFINISHED ⓘ |
| wheelArrangement | B-B ⓘ |
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: EMD GP9 locomotive Description of subject: The EMD GP9 locomotive is a widely used four-axle diesel-electric road switcher built in the 1950s that became one of North America's most successful and versatile freight and passenger locomotives.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.