IND/BMT/IRT unified system
E1034611
The IND/BMT/IRT unified system is the integrated network of former independent subway lines that together form the modern New York City Subway.
All labels observed (1)
| Label | Occurrences |
|---|---|
| IND/BMT/IRT unified system canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T13354522 — 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: IND/BMT/IRT unified system Context triple: [S (New York City Subway service), system, IND/BMT/IRT unified system]
-
A.
BMT
BMT (Brooklyn–Manhattan Transit Corporation) was a major private New York City subway operator whose lines now form one of the primary divisions of the modern NYC Subway system.
-
B.
BART distance-based fare system
The BART distance-based fare system is a pricing structure for the Bay Area Rapid Transit network in which riders are charged according to the length of their trip rather than a flat fare.
-
C.
IND system
The IND system is a major division of the New York City Subway, originally built as the city-owned Independent Subway System and now encompassing numerous lines and services across the network.
-
D.
CGS-EMU system
The CGS-EMU system is a variant of the centimeter–gram–second (CGS) system of units that uses the electromagnetic (EMU) subsystem for electrical and magnetic quantities, including the gauss as a unit of magnetic flux density.
-
E.
Dual System of Rapid Transit
The Dual System of Rapid Transit was an early 20th-century expansion and unification plan for New York City's subway network, implemented through joint contracts between the city and private transit companies.
- 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: IND/BMT/IRT unified system Target entity description: The IND/BMT/IRT unified system is the integrated network of former independent subway lines that together form the modern New York City Subway.
-
A.
BMT
BMT (Brooklyn–Manhattan Transit Corporation) was a major private New York City subway operator whose lines now form one of the primary divisions of the modern NYC Subway system.
-
B.
BART distance-based fare system
The BART distance-based fare system is a pricing structure for the Bay Area Rapid Transit network in which riders are charged according to the length of their trip rather than a flat fare.
-
C.
IND system
The IND system is a major division of the New York City Subway, originally built as the city-owned Independent Subway System and now encompassing numerous lines and services across the network.
-
D.
CGS-EMU system
The CGS-EMU system is a variant of the centimeter–gram–second (CGS) system of units that uses the electromagnetic (EMU) subsystem for electrical and magnetic quantities, including the gauss as a unit of magnetic flux density.
-
E.
Dual System of Rapid Transit
The Dual System of Rapid Transit was an early 20th-century expansion and unification plan for New York City's subway network, implemented through joint contracts between the city and private transit companies.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
component of the New York City Subway
ⓘ
public transit network ⓘ subway system ⓘ |
| connects |
Brooklyn
NERFINISHED
ⓘ
Manhattan NERFINISHED ⓘ Queens NERFINISHED ⓘ The Bronx NERFINISHED ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| electrification | third rail ⓘ |
| fareMedium |
MetroCard
NERFINISHED
ⓘ
OMNY NERFINISHED ⓘ |
| fareSystem | unified fare system ⓘ |
| governedBy | Metropolitan Transportation Authority policies ⓘ |
| hasFeature |
24-hour service on most lines
ⓘ
free transfers between former systems ⓘ integrated signaling system ⓘ interchange stations ⓘ unified route numbering and lettering ⓘ |
| hasPart |
Brooklyn–Manhattan Transit Corporation lines
NERFINISHED
ⓘ
Independent Subway System lines NERFINISHED ⓘ Interborough Rapid Transit Company lines NERFINISHED ⓘ |
| hasRouteDesignation |
lettered services (former BMT and IND lines)
ⓘ
numbered services (former IRT lines) ⓘ |
| hasService |
express services
ⓘ
local services ⓘ |
| historicalOrigin |
Brooklyn–Manhattan Transit Corporation
NERFINISHED
ⓘ
Independent Subway System NERFINISHED ⓘ Interborough Rapid Transit Company NERFINISHED ⓘ |
| integrationAspect |
fare integration
ⓘ
infrastructure interconnections ⓘ operational integration ⓘ |
| language | English signage ⓘ |
| locatedIn |
New York City
ⓘ
New York State NERFINISHED ⓘ |
| operator |
Metropolitan Transportation Authority
ⓘ
New York City Transit Authority NERFINISHED ⓘ |
| owner |
New York City
ⓘ
surface form:
City of New York
|
| partOf | New York City Subway ⓘ |
| purpose | to integrate former independent subway lines into a single network ⓘ |
| safetySystem |
automatic block signaling
ⓘ
communication-based train control (on some lines) ⓘ |
| serviceType | rapid transit ⓘ |
| shortName | IND/BMT/IRT NERFINISHED ⓘ |
| ticketing | proof-of-payment not used (gated entry system) ⓘ |
| trackGauge | standard gauge ⓘ |
| unificationProcess | city takeover of private subway companies ⓘ |
| unificationYear | 1940 ⓘ |
| usesRollingStock | electric multiple units ⓘ |
| zoneSystem | flat fare within system ⓘ |
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: IND/BMT/IRT unified system Description of subject: The IND/BMT/IRT unified system is the integrated network of former independent subway lines that together form the modern New York City Subway.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.