R21 series
E1041244
The R21 series is a class of New York City Subway rolling stock built for the IND/BMT divisions, featuring large-profile steel cars used in mid-20th-century service.
All labels observed (1)
| Label | Occurrences |
|---|---|
| R21 series canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T13457038 — 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: R21 series Context triple: [IND/BMT large-profile cars, hasCarTypeFamily, R21 series]
-
A.
I-70 Series
The I-70 Series is the nickname for the 1985 World Series matchup between the Kansas City Royals and the St. Louis Cardinals, named for the Interstate highway connecting the two Missouri cities.
-
B.
R2000
The R2000 is a 32-bit MIPS RISC microprocessor that became one of the earliest and most influential commercial implementations of the MIPS architecture in the mid-1980s.
-
C.
R2
R2 is the MBTA station code used to identify Ashmont station on Boston's Red Line transit system.
-
D.
TS 21-series
TS 21-series is a set of 3GPP technical specifications that define overall system architecture, principles, and frameworks for mobile telecommunications standards.
-
E.
223 series
The 223 series is a type of Japanese electric multiple unit commuter and suburban train operated primarily by JR West in the Kansai region.
- 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: R21 series Target entity description: The R21 series is a class of New York City Subway rolling stock built for the IND/BMT divisions, featuring large-profile steel cars used in mid-20th-century service.
-
A.
I-70 Series
The I-70 Series is the nickname for the 1985 World Series matchup between the Kansas City Royals and the St. Louis Cardinals, named for the Interstate highway connecting the two Missouri cities.
-
B.
R2000
The R2000 is a 32-bit MIPS RISC microprocessor that became one of the earliest and most influential commercial implementations of the MIPS architecture in the mid-1980s.
-
C.
R2
R2 is the MBTA station code used to identify Ashmont station on Boston's Red Line transit system.
-
D.
TS 21-series
TS 21-series is a set of 3GPP technical specifications that define overall system architecture, principles, and frameworks for mobile telecommunications standards.
-
E.
223 series
The 223 series is a type of Japanese electric multiple unit commuter and suburban train operated primarily by JR West in the Kansai region.
- F. None of above. chosen
Statements (26)
| Predicate | Object |
|---|---|
| instanceOf |
New York City Subway rolling stock
ⓘ
steel subway car ⓘ subway car class ⓘ |
| carbodyMaterial | steel ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| designedFor |
high-platform boarding
ⓘ
underground operation ⓘ |
| division |
BMT Division
NERFINISHED
ⓘ
IND Division ⓘ |
| doorType | side doors ⓘ |
| gauge | standard gauge ⓘ |
| hasOperator | MTA New York City Transit NERFINISHED ⓘ |
| location | New York City ⓘ |
| networkType | rapid transit ⓘ |
| operatedOn |
BMT lines
NERFINISHED
ⓘ
IND lines NERFINISHED ⓘ |
| operator | New York City Transit Authority NERFINISHED ⓘ |
| powered | third rail ⓘ |
| profileType | large-profile ⓘ |
| rollingStockFamily | IND/BMT large-profile cars NERFINISHED ⓘ |
| serviceEra | mid-20th century ⓘ |
| system | New York City Subway ⓘ |
| thirdRailType | 600 V DC third rail ⓘ |
| traction | electric ⓘ |
| transportMode | rail ⓘ |
| usedFor | passenger service ⓘ |
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: R21 series Description of subject: The R21 series is a class of New York City Subway rolling stock built for the IND/BMT divisions, featuring large-profile steel cars used in mid-20th-century service.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.