CTA 2400-series railcars
E444836
The CTA 2400-series railcars were an earlier generation of Chicago Transit Authority rapid transit cars that served as a key workhorse of the “L” system before being succeeded by later series.
All labels observed (1)
| Label | Occurrences |
|---|---|
| CTA 2400-series railcars canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4462315 — 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: CTA 2400-series railcars Context triple: [CTA 2600-series railcars, predecessorSeries, CTA 2400-series railcars]
-
A.
CTA 2600-series railcars
The CTA 2600-series railcars are a fleet of Chicago 'L' rapid transit cars introduced in the 1980s, known for their stainless-steel bodies and long service on multiple lines in the system.
-
B.
CTA 2200-series railcars
The CTA 2200-series railcars were a fleet of Chicago 'L' rapid transit cars built in the late 1960s, notable for their fluted stainless-steel sides and “blinker” door configuration, which served the system for several decades before retirement.
-
C.
CTA 3200-series railcars
The CTA 3200-series railcars are a fleet of Chicago "L" rapid transit cars introduced in the early 1990s, known for serving lines such as the Orange Line with modernized features compared to earlier series.
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D.
CTA 7000-series railcars
The CTA 7000-series railcars are a modern generation of Chicago Transit Authority rapid transit vehicles designed to replace older fleets with improved performance, accessibility, and passenger amenities.
-
E.
CTA 5000-series railcars
The CTA 5000-series railcars are a modern generation of Chicago "L" rapid transit cars featuring improved accessibility, digital signage, and enhanced passenger comfort and safety systems.
- 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: CTA 2400-series railcars Target entity description: The CTA 2400-series railcars were an earlier generation of Chicago Transit Authority rapid transit cars that served as a key workhorse of the “L” system before being succeeded by later series.
-
A.
CTA 2600-series railcars
The CTA 2600-series railcars are a fleet of Chicago 'L' rapid transit cars introduced in the 1980s, known for their stainless-steel bodies and long service on multiple lines in the system.
-
B.
CTA 2200-series railcars
The CTA 2200-series railcars were a fleet of Chicago 'L' rapid transit cars built in the late 1960s, notable for their fluted stainless-steel sides and “blinker” door configuration, which served the system for several decades before retirement.
-
C.
CTA 3200-series railcars
The CTA 3200-series railcars are a fleet of Chicago "L" rapid transit cars introduced in the early 1990s, known for serving lines such as the Orange Line with modernized features compared to earlier series.
-
D.
CTA 7000-series railcars
The CTA 7000-series railcars are a modern generation of Chicago Transit Authority rapid transit vehicles designed to replace older fleets with improved performance, accessibility, and passenger amenities.
-
E.
CTA 5000-series railcars
The CTA 5000-series railcars are a modern generation of Chicago "L" rapid transit cars featuring improved accessibility, digital signage, and enhanced passenger comfort and safety systems.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
Chicago 'L' rolling stock
ⓘ
rapid transit railcar series ⓘ |
| brakeType |
dynamic brakes
ⓘ
pneumatic brakes ⓘ |
| carBody | stainless steel ⓘ |
| carBodyMaterial | stainless steel ⓘ |
| carHeight | approximately 12 feet ⓘ |
| carLength | approximately 48 feet ⓘ |
| carWidth | approximately 9.3 feet ⓘ |
| collectionMethod | third rail contact shoe ⓘ |
| controlSystem | cam control ⓘ |
| countryOfOrigin |
United States of America
ⓘ
surface form:
United States
|
| designedBy | Boeing-Vertol NERFINISHED ⓘ |
| designedFor | high-platform rapid transit ⓘ |
| doorType | sliding doors ⓘ |
| electricSystem | 600 V DC third rail ⓘ |
| enteredService | 1976 ⓘ |
| fleetNumbers | 2401–2600 ⓘ |
| formation | married pairs ⓘ |
| gauge | standard gauge ⓘ |
| heritageUnitsPreservedAt | Illinois Railway Museum NERFINISHED ⓘ |
| heritageUnitsPreservedBy | Chicago Transit Authority NERFINISHED ⓘ |
| introduced | 1976 ⓘ |
| manufacturer | Boeing-Vertol NERFINISHED ⓘ |
| notableFeature |
full-width cabs on some units
ⓘ
stainless steel fluted sides ⓘ updated interior compared to earlier series ⓘ |
| numberBuilt | 200 ⓘ |
| operatedInCity | Chicago NERFINISHED ⓘ |
| operatedInCountry | United States NERFINISHED ⓘ |
| operatedInState | Illinois NERFINISHED ⓘ |
| operator | Chicago Transit Authority ⓘ |
| powerOutput | approximately 100 hp per motor ⓘ |
| precededBy | CTA 2200-series railcars NERFINISHED ⓘ |
| primaryRole | passenger service ⓘ |
| retired | 2014 ⓘ |
| serviceType | rapid transit ⓘ |
| status | retired from regular service ⓘ |
| succeededBy |
CTA 2600-series railcars
NERFINISHED
ⓘ
CTA 3200-series railcars NERFINISHED ⓘ |
| trackGauge | 1435 mm ⓘ |
| usedOnLine |
Blue Line
NERFINISHED
ⓘ
Brown Line NERFINISHED ⓘ Green Line NERFINISHED ⓘ Orange Line NERFINISHED ⓘ Purple Line NERFINISHED ⓘ Red Line NERFINISHED ⓘ Yellow Line NERFINISHED ⓘ |
| usedOnSystem | Chicago 'L' NERFINISHED ⓘ |
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: CTA 2400-series railcars Description of subject: The CTA 2400-series railcars were an earlier generation of Chicago Transit Authority rapid transit cars that served as a key workhorse of the “L” system before being succeeded by later series.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.