B&O No. 25 William Mason
E594344
B&O No. 25 "William Mason" is a preserved 19th-century steam locomotive famed for its historic design and frequent use in period films and railroad heritage displays.
All labels observed (1)
| Label | Occurrences |
|---|---|
| B&O No. 25 William Mason canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6462628 — 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: B&O No. 25 William Mason Context triple: [B&O Railroad Museum, notableExhibit, B&O No. 25 William Mason]
-
A.
Shay locomotive
The Shay locomotive is a geared steam locomotive design, widely used on logging and industrial railroads for its exceptional low-speed power and ability to handle steep grades and sharp curves.
-
B.
LMS Jubilee Class
The LMS Jubilee Class was a class of British steam locomotives built in the 1930s for express passenger services on the London, Midland and Scottish Railway.
-
C.
LMS 8F Class
The LMS 8F Class is a British heavy freight steam locomotive type widely used by the London, Midland and Scottish Railway and later by British Railways, particularly during World War II.
-
D.
LNER Class A4 4468 Mallard
LNER Class A4 4468 Mallard is a famous British steam locomotive best known for holding the world speed record for steam traction, set in 1938.
-
E.
BR Standard Class 5
The BR Standard Class 5 was a versatile British steam locomotive class introduced in the 1950s for mixed-traffic duties across the nationalised railway network.
- 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: B&O No. 25 William Mason Target entity description: B&O No. 25 "William Mason" is a preserved 19th-century steam locomotive famed for its historic design and frequent use in period films and railroad heritage displays.
-
A.
Shay locomotive
The Shay locomotive is a geared steam locomotive design, widely used on logging and industrial railroads for its exceptional low-speed power and ability to handle steep grades and sharp curves.
-
B.
LMS Jubilee Class
The LMS Jubilee Class was a class of British steam locomotives built in the 1930s for express passenger services on the London, Midland and Scottish Railway.
-
C.
LMS 8F Class
The LMS 8F Class is a British heavy freight steam locomotive type widely used by the London, Midland and Scottish Railway and later by British Railways, particularly during World War II.
-
D.
LNER Class A4 4468 Mallard
LNER Class A4 4468 Mallard is a famous British steam locomotive best known for holding the world speed record for steam traction, set in 1938.
-
E.
BR Standard Class 5
The BR Standard Class 5 was a versatile British steam locomotive class introduced in the 1950s for mixed-traffic duties across the nationalised railway network.
- F. None of above. chosen
Statements (37)
| Predicate | Object |
|---|---|
| instanceOf | steam locomotive ⓘ |
| builder | Mason Machine Works NERFINISHED ⓘ |
| category |
4-4-0 locomotives
ⓘ
Baltimore and Ohio Railroad locomotives NERFINISHED ⓘ individual locomotives of the United States ⓘ steam locomotives preserved in the United States ⓘ |
| completed | 1856 ⓘ |
| configuration | 4-4-0 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| featuredIn |
The Great Locomotive Chase (film)
NERFINISHED
ⓘ
Wild Wild West (1999 film) NERFINISHED ⓘ various historical reenactments ⓘ |
| fuelType |
coal
ⓘ
wood ⓘ |
| gauge | 4 ft 8 1⁄2 in standard gauge ⓘ |
| hasBoiler | fire-tube boiler ⓘ |
| heritageDesignation | historic locomotive ⓘ |
| historicEra | 19th century ⓘ |
| introduced | 1856 ⓘ |
| locatedIn | Baltimore, Maryland NERFINISHED ⓘ |
| location | B&O Railroad Museum NERFINISHED ⓘ |
| manufacturer | Mason Machine Works NERFINISHED ⓘ |
| namedAfter | William Mason NERFINISHED ⓘ |
| notableFor |
authentic 19th-century styling
ⓘ
frequent film appearances ⓘ historic design ⓘ |
| operator | Baltimore and Ohio Railroad NERFINISHED ⓘ |
| originalOwner | Baltimore and Ohio Railroad NERFINISHED ⓘ |
| powerType | steam ⓘ |
| railwayLine | Baltimore and Ohio Railroad NERFINISHED ⓘ |
| status | preserved ⓘ |
| traction | adhesion ⓘ |
| usedFor |
period films
ⓘ
railroad heritage displays ⓘ tourist excursions ⓘ |
| wheelArrangement | American type ⓘ |
| whyteType | 4-4-0 ⓘ |
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: B&O No. 25 William Mason Description of subject: B&O No. 25 "William Mason" is a preserved 19th-century steam locomotive famed for its historic design and frequent use in period films and railroad heritage displays.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.