Bollman Truss Railroad Bridge
E870082
The Bollman Truss Railroad Bridge is a historic 19th-century iron railroad bridge in Savage, Maryland, notable as one of the earliest surviving examples of a cast- and wrought-iron truss bridge in the United States.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Bollman Truss Railroad Bridge canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10547318 — 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: Bollman Truss Railroad Bridge Context triple: [Savage, Maryland, hasLandmark, Bollman Truss Railroad Bridge]
-
A.
Panhandle Railroad Bridge
The Panhandle Railroad Bridge is a historic steel truss railroad bridge spanning the Monongahela River in Pittsburgh, Pennsylvania, now used by the city's light rail system.
-
B.
High Trestle Trail Bridge
The High Trestle Trail Bridge is a strikingly designed former railroad bridge turned pedestrian and cycling landmark, renowned for its illuminated steel “tunnel” art installation spanning the Des Moines River in Iowa.
-
C.
Kinzie Street Railroad Bridge
The Kinzie Street Railroad Bridge is a historic, early 20th-century vertical-lift railroad bridge in downtown Chicago, notable as one of the city’s iconic industrial-era river crossings.
-
D.
Great River Bridge
The Great River Bridge is a cable-stayed highway bridge spanning the Mississippi River at Burlington, Iowa, serving as a key regional crossing between Iowa and Illinois.
-
E.
Imjin River Railroad Bridge
The Imjin River Railroad Bridge is a historic railway bridge in South Korea that spans the Imjin River near the Demilitarized Zone and has significance dating back to the Korean War.
- 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: Bollman Truss Railroad Bridge Target entity description: The Bollman Truss Railroad Bridge is a historic 19th-century iron railroad bridge in Savage, Maryland, notable as one of the earliest surviving examples of a cast- and wrought-iron truss bridge in the United States.
-
A.
Panhandle Railroad Bridge
The Panhandle Railroad Bridge is a historic steel truss railroad bridge spanning the Monongahela River in Pittsburgh, Pennsylvania, now used by the city's light rail system.
-
B.
High Trestle Trail Bridge
The High Trestle Trail Bridge is a strikingly designed former railroad bridge turned pedestrian and cycling landmark, renowned for its illuminated steel “tunnel” art installation spanning the Des Moines River in Iowa.
-
C.
Kinzie Street Railroad Bridge
The Kinzie Street Railroad Bridge is a historic, early 20th-century vertical-lift railroad bridge in downtown Chicago, notable as one of the city’s iconic industrial-era river crossings.
-
D.
Great River Bridge
The Great River Bridge is a cable-stayed highway bridge spanning the Mississippi River at Burlington, Iowa, serving as a key regional crossing between Iowa and Illinois.
-
E.
Imjin River Railroad Bridge
The Imjin River Railroad Bridge is a historic railway bridge in South Korea that spans the Imjin River near the Demilitarized Zone and has significance dating back to the Korean War.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
historic bridge
ⓘ
iron railroad bridge ⓘ truss bridge ⓘ |
| builtFor | Baltimore and Ohio Railroad NERFINISHED ⓘ |
| completionDate | 1852 ⓘ |
| constructionStartDate | 1850 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| county | Howard County NERFINISHED ⓘ |
| crosses | Little Patuxent River NERFINISHED ⓘ |
| currentUse | pedestrian bridge ⓘ |
| designer | Wendel Bollman NERFINISHED ⓘ |
| engineeringSignificance | early use of independent tension and compression members ⓘ |
| hasCoordinateLatitude | 39.137 ⓘ |
| hasCoordinateLongitude | -76.824 ⓘ |
| hasSubstructure | stone masonry piers ⓘ |
| hasSuperstructure | iron truss ⓘ |
| heritageDesignation | National Historic Landmark ⓘ |
| heritageDesignationDate | 1964 ⓘ |
| historicEra | 19th century ⓘ |
| length | about 160 feet ⓘ |
| listedOn | National Register of Historic Places ⓘ |
| locatedIn |
Howard County, Maryland
NERFINISHED
ⓘ
Maryland ⓘ Savage, Maryland NERFINISHED ⓘ United States of America ⓘ
surface form:
United States
|
| material |
cast iron
ⓘ
wrought iron ⓘ |
| namedAfter | Wendel Bollman NERFINISHED ⓘ |
| notableFor |
being one of the earliest surviving cast- and wrought-iron truss bridges in the United States
ⓘ
being the only surviving example of the Bollman suspension truss system ⓘ |
| NRHPListingDate | 1966 ⓘ |
| NRHPReferenceNumber | 66000035 ⓘ |
| numberOfSpans | 2 ⓘ |
| openToPublic | yes ⓘ |
| originalLocation | near Relay, Maryland ⓘ |
| owner | Howard County, Maryland NERFINISHED ⓘ |
| partOf | Savage Mill Historic District NERFINISHED ⓘ |
| preservationStatus | preserved ⓘ |
| railroadLineServed | Baltimore and Ohio Railroad Washington Branch NERFINISHED ⓘ |
| relocatedTo | Savage, Maryland NERFINISHED ⓘ |
| relocationDate | 1887 ⓘ |
| spanLength | about 79 feet ⓘ |
| state | Maryland ⓘ |
| structureType | Bollman suspension truss ⓘ |
| usedFor | railroad traffic ⓘ |
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: Bollman Truss Railroad Bridge Description of subject: The Bollman Truss Railroad Bridge is a historic 19th-century iron railroad bridge in Savage, Maryland, notable as one of the earliest surviving examples of a cast- and wrought-iron truss bridge in the United States.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.