Mark IV trains
E668426
Mark IV trains are an older generation of automated rapid transit vehicles that operated on Vancouver’s SkyTrain system before being succeeded by the more modern Mark V trains.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Mark V trains | 2 |
| Mark IV trains canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7484075 — 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: Mark IV trains Context triple: [Mark V trains, precededBy, Mark IV trains]
-
A.
Mark III trains
Mark III trains are a generation of streamlined monorail vehicles that operated on the Disneyland Monorail System, featuring updated design and technology over earlier models.
-
B.
Mark II trains
Mark II trains are an updated generation of streamlined monorail vehicles used on the Disneyland Monorail System, featuring improved design and capacity over the original models.
-
C.
Mark VII trains
Mark VII trains are the modern generation of streamlined, retro-futuristic monorail vehicles that serve as the primary passenger trains on the Disneyland Monorail System.
-
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.
British Rail Class 143
The British Rail Class 143 is a type of diesel multiple unit "Pacer" train built in the 1980s for use on regional and commuter rail services in the UK.
- 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: Mark IV trains Target entity description: Mark IV trains are an older generation of automated rapid transit vehicles that operated on Vancouver’s SkyTrain system before being succeeded by the more modern Mark V trains.
-
A.
Mark III trains
Mark III trains are a generation of streamlined monorail vehicles that operated on the Disneyland Monorail System, featuring updated design and technology over earlier models.
-
B.
Mark II trains
Mark II trains are an updated generation of streamlined monorail vehicles used on the Disneyland Monorail System, featuring improved design and capacity over the original models.
-
C.
Mark VII trains
Mark VII trains are the modern generation of streamlined, retro-futuristic monorail vehicles that serve as the primary passenger trains on the Disneyland Monorail System.
-
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.
British Rail Class 143
The British Rail Class 143 is a type of diesel multiple unit "Pacer" train built in the 1980s for use on regional and commuter rail services in the UK.
- F. None of above. chosen
Statements (41)
| Predicate | Object |
|---|---|
| instanceOf |
automated rapid transit rolling stock
ⓘ
driverless metro train ⓘ |
| automationLevel | Grade of Automation 4 ⓘ |
| cityServed |
Burnaby
ⓘ
Coquitlam ⓘ New Westminster ⓘ Port Moody ⓘ Surrey ⓘ Vancouver ⓘ |
| controlSystem | automatic train control ⓘ |
| country | Canada ⓘ |
| designedFor | unattended train operation ⓘ |
| doorType | sliding side doors ⓘ |
| followedBy |
Mark V trains
ⓘ
linked to:
Mark IV trains
|
| locatedOn | grade-separated guideway ⓘ |
| network |
TransLink SkyTrain network
ⓘ
linked to:
Metro Vancouver public transit network
|
| operatedIn |
British Columbia
ⓘ
Canada ⓘ Metro Vancouver ⓘ
linked to:
Metro Vancouver, Canada
|
| operationMode |
driverless
ⓘ
fully automated ⓘ |
| operator |
British Columbia Rapid Transit Company
ⓘ
linked to:
BC Rapid Transit Company
|
| owner | TransLink ⓘ |
| partOf |
SkyTrain rolling stock fleet
ⓘ
linked to:
SkyTrain
|
| partOfSystem |
SkyTrain Expo Line
ⓘ
SkyTrain Millennium Line ⓘ |
| powerCollectionMethod | third rail ⓘ |
| powerSupplyType | 750 V DC third rail ⓘ |
| precededBy | Mark III trains ⓘ |
| propulsionType | electric multiple unit ⓘ |
| regionServed |
Metro Vancouver region
ⓘ
linked to:
Metro Vancouver, Canada
|
| safetyFeature |
automatic train protection
ⓘ
platform-train door interlocks ⓘ |
| serviceType | rapid transit ⓘ |
| succeededBy |
Mark V trains
ⓘ
linked to:
Mark IV trains
|
| successorGeneration | Mark V trains ⓘ |
| trackGauge | standard gauge ⓘ |
| tractionType | linear induction motor ⓘ |
| usedFor |
high-frequency metro service
ⓘ
urban rapid transit ⓘ |
| usedOn | SkyTrain ⓘ |
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: Mark IV trains Description of subject: Mark IV trains are an older generation of automated rapid transit vehicles that operated on Vancouver’s SkyTrain system before being succeeded by the more modern Mark V trains.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Mark IV trains
linked to: Mark IV trains