Old Main Line of the Baltimore and Ohio Railroad

E1501408 UNEXPLORED

The Old Main Line of the Baltimore and Ohio Railroad is one of the earliest railroad routes in the United States, historically linking Baltimore with the interior and pioneering American rail transportation.

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All labels observed (4)

Label	Occurrences
Baltimore and Ohio Railroad main line	4
Baltimore and Ohio Railroad Old Main Line	1
Old Main Line of the Baltimore and Ohio Railroad canonical	1
former Baltimore and Ohio Railroad main line	1

How this entity was disambiguated

This entity first appeared as the object of triple T21770865 — 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: Old Main Line of the Baltimore and Ohio Railroad
Context triple: [Old Main Line Trail, follows, Old Main Line of the Baltimore and Ohio Railroad]

A. Old Main Line
Old Main Line is a historic section of the Birmingham Canal Navigations in England, forming part of the early industrial-era canal network around Birmingham.
B. South Side Railroad
South Side Railroad was a key 19th-century rail line in Virginia that linked the strategic transportation hub of Petersburg with Richmond and other points west, playing an important role in regional commerce and Civil War logistics.
C. former Georgetown Branch of the Baltimore and Ohio Railroad
The former Georgetown Branch of the Baltimore and Ohio Railroad was a freight rail line in the Washington, D.C. area that once connected the main B&O network to Georgetown along the Potomac River.
D. Perkiomen Railroad
Perkiomen Railroad was a historic rail line in southeastern Pennsylvania that later became the basis for the modern Perkiomen Trail.
E. Washington–Baltimore rail corridor
The Washington–Baltimore rail corridor is a heavily traveled rail route linking the U.S. capital with Baltimore, used by both passenger and freight services and forming a key segment of the Northeast transportation 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: Old Main Line of the Baltimore and Ohio Railroad
Target entity description: The Old Main Line of the Baltimore and Ohio Railroad is one of the earliest railroad routes in the United States, historically linking Baltimore with the interior and pioneering American rail transportation.

A. Old Main Line
Old Main Line is a historic section of the Birmingham Canal Navigations in England, forming part of the early industrial-era canal network around Birmingham.
B. South Side Railroad
South Side Railroad was a key 19th-century rail line in Virginia that linked the strategic transportation hub of Petersburg with Richmond and other points west, playing an important role in regional commerce and Civil War logistics.
C. former Georgetown Branch of the Baltimore and Ohio Railroad
The former Georgetown Branch of the Baltimore and Ohio Railroad was a freight rail line in the Washington, D.C. area that once connected the main B&O network to Georgetown along the Potomac River.
D. Perkiomen Railroad
Perkiomen Railroad was a historic rail line in southeastern Pennsylvania that later became the basis for the modern Perkiomen Trail.
E. Washington–Baltimore rail corridor
The Washington–Baltimore rail corridor is a heavily traveled rail route linking the U.S. capital with Baltimore, used by both passenger and freight services and forming a key segment of the Northeast transportation network.
F. None of above. chosen