WMATA 4000-series railcar
E563836
The WMATA 4000-series railcar was an older generation of Washington Metro rolling stock that served the D.C. region’s subway system before being phased out in favor of newer models.
All labels observed (1)
| Label | Occurrences |
|---|---|
| WMATA 4000-series railcar canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T5989755 — 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: WMATA 4000-series railcar Context triple: [WMATA 7000-series railcar, replacedSeries, WMATA 4000-series railcar]
-
A.
WMATA 5000-series railcar
The WMATA 5000-series railcar is a generation of Washington Metro rapid transit cars built for improved performance and passenger amenities, used across multiple lines in the system.
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B.
WMATA 3000-series railcar
The WMATA 3000-series railcar is a generation of Washington Metro rapid transit vehicles used across multiple lines in the system, featuring stainless-steel construction and updated interiors compared to earlier series.
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C.
WMATA 6000-series railcar
The WMATA 6000-series railcar is a generation of Washington Metro rapid transit cars featuring modernized interiors, improved safety systems, and updated propulsion technology used across multiple lines in the system.
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D.
WMATA 7000-series railcar
The WMATA 7000-series railcar is a modern, stainless-steel rapid transit car used by the Washington Metro system, featuring improved safety, digital displays, and updated interiors compared to older fleets.
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E.
WMATA 1000-series railcar
The WMATA 1000-series railcar was the original generation of Metrorail subway cars in Washington, D.C., known for its early service on the system and later concerns over crashworthiness that led to its retirement.
- 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: WMATA 4000-series railcar Target entity description: The WMATA 4000-series railcar was an older generation of Washington Metro rolling stock that served the D.C. region’s subway system before being phased out in favor of newer models.
-
A.
WMATA 5000-series railcar
The WMATA 5000-series railcar is a generation of Washington Metro rapid transit cars built for improved performance and passenger amenities, used across multiple lines in the system.
-
B.
WMATA 3000-series railcar
The WMATA 3000-series railcar is a generation of Washington Metro rapid transit vehicles used across multiple lines in the system, featuring stainless-steel construction and updated interiors compared to earlier series.
-
C.
WMATA 6000-series railcar
The WMATA 6000-series railcar is a generation of Washington Metro rapid transit cars featuring modernized interiors, improved safety systems, and updated propulsion technology used across multiple lines in the system.
-
D.
WMATA 7000-series railcar
The WMATA 7000-series railcar is a modern, stainless-steel rapid transit car used by the Washington Metro system, featuring improved safety, digital displays, and updated interiors compared to older fleets.
-
E.
WMATA 1000-series railcar
The WMATA 1000-series railcar was the original generation of Metrorail subway cars in Washington, D.C., known for its early service on the system and later concerns over crashworthiness that led to its retirement.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf | rapid transit railcar ⓘ |
| brakeType | electro-pneumatic brakes ⓘ |
| carbodyMaterial | stainless steel ⓘ |
| controlSystem | cab signaling compatible ⓘ |
| countryOfManufacture | Italy NERFINISHED ⓘ |
| couplingType | semi-permanent couplers ⓘ |
| designedFor | high-platform rapid transit ⓘ |
| designedToBeCompatibleWith |
WMATA 1000-series railcar
NERFINISHED
ⓘ
WMATA 2000-series railcar NERFINISHED ⓘ WMATA 3000-series railcar NERFINISHED ⓘ |
| doorConfiguration | 4 doors per side per car ⓘ |
| doorOperation | powered, operator-controlled ⓘ |
| doorType | sliding pocket doors ⓘ |
| electrificationSystem | 750 V DC third rail ⓘ |
| enteredService | 1991 ⓘ |
| fleetSeries | 4000-series ⓘ |
| followedBy |
WMATA 5000-series railcar
NERFINISHED
ⓘ
WMATA 6000-series railcar NERFINISHED ⓘ |
| formation | married pairs ⓘ |
| introducedAs | newer generation than 1000- and 2000-series ⓘ |
| manufacturer | Breda Costruzioni Ferroviarie NERFINISHED ⓘ |
| network | Metrorail NERFINISHED ⓘ |
| operatedOn |
Blue Line
NERFINISHED
ⓘ
Green Line NERFINISHED ⓘ Orange Line NERFINISHED ⓘ Red Line NERFINISHED ⓘ Yellow Line NERFINISHED ⓘ |
| operator | Washington Metropolitan Area Transit Authority ⓘ |
| ownedBy | Washington Metropolitan Area Transit Authority ⓘ |
| phasedOutInFavorOf | newer WMATA railcar series ⓘ |
| powerCollectionMethod | third rail ⓘ |
| precededBy | WMATA 3000-series railcar NERFINISHED ⓘ |
| propulsionType | electric multiple unit ⓘ |
| replacedBy | WMATA 7000-series railcar NERFINISHED ⓘ |
| retirementCompleted | 2017 ⓘ |
| safetySystems | automatic train control ⓘ |
| servesSystem | Washington Metro NERFINISHED ⓘ |
| serviceArea |
District of Columbia
NERFINISHED
ⓘ
Maryland suburbs ⓘ Northern Virginia NERFINISHED ⓘ |
| serviceType | heavy rail rapid transit ⓘ |
| status | retired ⓘ |
| trackGauge | standard gauge ⓘ |
| usedFor | passenger transport ⓘ |
| usedInRegion | Washington, D.C. metropolitan area NERFINISHED ⓘ |
| usedUntil | mid-2010s ⓘ |
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: WMATA 4000-series railcar Description of subject: The WMATA 4000-series railcar was an older generation of Washington Metro rolling stock that served the D.C. region’s subway system before being phased out in favor of newer models.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.