M4 railcar
E597589
The M4 railcar is an electric multiple-unit passenger train used in commuter rail service, notably on lines such as the New Haven Line.
All labels observed (2)
| Label | Occurrences |
|---|---|
| M4 railcar canonical | 2 |
| M1 railcar (for New Haven Line service) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6448634 — 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: M4 railcar Context triple: [New Haven Line, usesRollingStock, M4 railcar]
-
A.
M2 railcar
The M2 railcar is an electric multiple-unit passenger train used by commuter rail services in the northeastern United States, particularly known for operating on the New Haven Line.
-
B.
Endeavour railcar
The Endeavour railcar is a class of diesel multiple unit passenger trains operating regional and intercity services in New South Wales, Australia.
-
C.
M3 electric multiple unit
The M3 electric multiple unit is a class of electric commuter rail cars used by the Long Island Rail Road for high-capacity passenger service in the New York metropolitan area.
-
D.
M7 electric multiple unit
The M7 electric multiple unit is a modern commuter rail car class built for high-frequency, third-rail electrified service, notably operating on New York’s Long Island Rail Road and similar regional rail networks.
-
E.
M9 electric multiple unit
The M9 electric multiple unit is a modern commuter rail train used by the Long Island Rail Road, designed to replace older fleets with improved performance, safety, and passenger amenities.
- 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: M4 railcar Target entity description: The M4 railcar is an electric multiple-unit passenger train used in commuter rail service, notably on lines such as the New Haven Line.
-
A.
M2 railcar
The M2 railcar is an electric multiple-unit passenger train used by commuter rail services in the northeastern United States, particularly known for operating on the New Haven Line.
-
B.
Endeavour railcar
The Endeavour railcar is a class of diesel multiple unit passenger trains operating regional and intercity services in New South Wales, Australia.
-
C.
M3 electric multiple unit
The M3 electric multiple unit is a class of electric commuter rail cars used by the Long Island Rail Road for high-capacity passenger service in the New York metropolitan area.
-
D.
M7 electric multiple unit
The M7 electric multiple unit is a modern commuter rail car class built for high-frequency, third-rail electrified service, notably operating on New York’s Long Island Rail Road and similar regional rail networks.
-
E.
M9 electric multiple unit
The M9 electric multiple unit is a modern commuter rail train used by the Long Island Rail Road, designed to replace older fleets with improved performance, safety, and passenger amenities.
- F. None of above. chosen
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf |
commuter railcar
ⓘ
electric multiple unit ⓘ passenger railcar ⓘ |
| compatibleWith | electrified mainline railways ⓘ |
| designedFor | high-platform boarding ⓘ |
| electrificationSystem |
overhead catenary
ⓘ
third rail ⓘ |
| hasBogieConfiguration | two-axle bogies ⓘ |
| hasBrakingSystem |
air brakes
ⓘ
dynamic brakes ⓘ |
| hasCarBody | steel carbody ⓘ |
| hasCommunicationSystem | public address system ⓘ |
| hasControlSystem | multiple-unit control ⓘ |
| hasCouplers | automatic couplers ⓘ |
| hasDoorsOnSides | true ⓘ |
| hasDoorsOperation | power-operated doors ⓘ |
| hasElectricTraction | true ⓘ |
| hasFixedFormation | multiple-car sets ⓘ |
| hasHeating | electric or HVAC heating ⓘ |
| hasHVAC | air conditioning system ⓘ |
| hasInteriorLayout | longitudinal and transverse seating ⓘ |
| hasLighting | electric interior lighting ⓘ |
| hasMultipleUnitsOperation | true ⓘ |
| hasOperatorCab | true ⓘ |
| hasPantograph | true ⓘ |
| hasPassengerCapacity | seated and standing passengers ⓘ |
| hasPassengerSeating | true ⓘ |
| operatedBy | Metro-North Railroad ⓘ |
| operatedInCountry |
United States
ⓘ
linked to:
United States of America
|
| poweredBy | electricity ⓘ |
| railwayTrafficMode | heavy rail ⓘ |
| serviceType |
commuter rail
ⓘ
suburban rail ⓘ |
| trackGauge | standard gauge ⓘ |
| usedFor |
commuter rail service
ⓘ
regional passenger transport ⓘ |
| usedInRegion | Northeastern United States ⓘ |
| usedOnLine |
Danbury Branch
ⓘ
New Canaan Branch ⓘ New Haven Line ⓘ Waterbury Branch ⓘ |
| usedOnNetwork |
Metro-North New Haven Line network
ⓘ
linked to:
Metro-North Railroad New Haven Division
|
| usedOnServicePattern |
all-stops commuter services
ⓘ
limited-stop commuter services ⓘ |
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: M4 railcar Description of subject: The M4 railcar is an electric multiple-unit passenger train used in commuter rail service, notably on lines such as the New Haven Line.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: M4 railcar