A Line (Denver commuter rail)
E276574
A Line (Denver commuter rail) is an electric commuter rail service in the Denver metropolitan area that connects downtown Denver’s Union Station with Denver International Airport and several intermediate neighborhoods and suburbs.
All labels observed (4)
| Label | Occurrences |
|---|---|
| A Line (Denver commuter rail) canonical | 3 |
| A Line (RTD Denver) | 1 |
| A Line (RTD commuter rail) | 1 |
| Denver–Airport rail corridor | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2550256 — 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: A Line (Denver commuter rail) Context triple: [Regional Transportation District, operates, A Line (Denver commuter rail)]
-
A.
W Line (RTD)
The W Line (RTD) is a light rail route in the Denver metropolitan area that connects downtown Denver with the western suburbs, including Lakewood and Golden, as part of the Regional Transportation District system.
-
B.
Denver RTD
Denver RTD is the regional public transportation agency serving the Denver metropolitan area in Colorado, operating buses, light rail, and commuter rail services.
-
C.
Metra Union Pacific West Line
The Metra Union Pacific West Line is a commuter rail line in the Chicago metropolitan area that runs between downtown Chicago and western suburbs, including communities in DuPage County.
-
D.
Metra Union Pacific Northwest Line
The Metra Union Pacific Northwest Line is a commuter rail line in the Chicago metropolitan area that provides service between downtown Chicago and its northwestern suburbs, including parts of McHenry County, Illinois.
-
E.
DART Light Rail
DART Light Rail is a light rail transit system serving the Dallas–Fort Worth metropolitan area, operated by Dallas Area Rapid Transit.
- 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: A Line (Denver commuter rail) Target entity description: A Line (Denver commuter rail) is an electric commuter rail service in the Denver metropolitan area that connects downtown Denver’s Union Station with Denver International Airport and several intermediate neighborhoods and suburbs.
-
A.
W Line (RTD)
The W Line (RTD) is a light rail route in the Denver metropolitan area that connects downtown Denver with the western suburbs, including Lakewood and Golden, as part of the Regional Transportation District system.
-
B.
Denver RTD
Denver RTD is the regional public transportation agency serving the Denver metropolitan area in Colorado, operating buses, light rail, and commuter rail services.
-
C.
Metra Union Pacific West Line
The Metra Union Pacific West Line is a commuter rail line in the Chicago metropolitan area that runs between downtown Chicago and western suburbs, including communities in DuPage County.
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D.
Metra Union Pacific Northwest Line
The Metra Union Pacific Northwest Line is a commuter rail line in the Chicago metropolitan area that provides service between downtown Chicago and its northwestern suburbs, including parts of McHenry County, Illinois.
-
E.
DART Light Rail
DART Light Rail is a light rail transit system serving the Dallas–Fort Worth metropolitan area, operated by Dallas Area Rapid Transit.
- F. None of above. chosen
Statements (40)
| Predicate | Object |
|---|---|
| instanceOf |
airport rail link
ⓘ
commuter rail line ⓘ electric railway ⓘ public transport service ⓘ |
| alsoKnownAs |
Denver A Line
ⓘ
linked to:
Denver RTD A Line
University of Colorado A Line ⓘ |
| category |
Airport rail links in the United States
ⓘ
Rail transport in Denver ⓘ |
| connects |
Adams County, Colorado
ⓘ
Aurora, Colorado ⓘ Denver International Airport ⓘ Denver Union Station ⓘ
linked to:
Union Station (Denver)
intermediate neighborhoods and suburbs in Denver metropolitan area ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| electrification | 25 kV AC overhead catenary ⓘ |
| fareSystem | Regional Transportation District fare system ⓘ |
| gauge | standard gauge ⓘ |
| hasStation |
38th & Blake station
ⓘ
40th Avenue & Airport Boulevard–Gateway Park station ⓘ 61st & Peña station ⓘ Central Park station ⓘ Denver Airport station ⓘ Peoria station ⓘ Union Station ⓘ |
| locatedIn |
Colorado
ⓘ
Denver metropolitan area ⓘ
linked to:
Denver–Aurora–Lakewood metropolitan area
United States ⓘ
linked to:
United States of America
|
| opened | 2016 ⓘ |
| operatedBy |
Denver Transit Operators
ⓘ
linked to:
Denver RTD
Regional Transportation District ⓘ |
| owner | Regional Transportation District ⓘ |
| partOf |
FasTracks program
ⓘ
linked to:
FasTracks rail lines
Regional Transportation District ⓘ |
| primaryPurpose | link downtown Denver with Denver International Airport ⓘ |
| rollingStock | electric multiple units ⓘ |
| serviceType |
airport express
ⓘ
commuter rail ⓘ |
| terminus |
Denver International Airport
ⓘ
Denver Union Station ⓘ
linked to:
Union Station (Denver)
|
| uses | electrified double-track alignment ⓘ |
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: A Line (Denver commuter rail) Description of subject: A Line (Denver commuter rail) is an electric commuter rail service in the Denver metropolitan area that connects downtown Denver’s Union Station with Denver International Airport and several intermediate neighborhoods and suburbs.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.