CSX Old Main Line Subdivision

E430951

freight rail line railway line

The CSX Old Main Line Subdivision is a historic freight rail line in Maryland that traces much of the original route of the Baltimore and Ohio Railroad, one of the oldest railroads in the United States.

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All labels observed (3)

Label	Occurrences
CSX Old Main Line Subdivision canonical	2
Old Main Line Subdivision	2
CSX Transportation Old Main Line Subdivision	1

How this entity was disambiguated

This entity first appeared as the object of triple T4297265 — 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: CSX Old Main Line Subdivision
Context triple: [Point of Rocks station, railwayLineJunction, CSX Old Main Line Subdivision]

A. CSX RF&P Subdivision
The CSX RF&P Subdivision is a major CSX Transportation rail line in Virginia that forms part of the busy freight and passenger corridor linking Washington, D.C. with Richmond and points south.
B. CSX Capital Subdivision
CSX Capital Subdivision is a CSX Transportation rail line in Maryland that serves as a key freight and commuter corridor between Washington, D.C., and Baltimore.
C. CSX Bellwood Subdivision
The CSX Bellwood Subdivision is a freight rail line in Virginia operated by CSX Transportation, forming part of the company’s network around the Richmond area.
D. CSX Transportation Cumberland Subdivision
CSX Transportation's Cumberland Subdivision is a major freight rail line running through Maryland and West Virginia that also hosts MARC commuter rail service on the Brunswick Line.
E. CSX Trenton Subdivision
The CSX Trenton Subdivision is a freight rail line in the northeastern United States operated by CSX Transportation, forming part of a major corridor between Philadelphia and North Jersey.
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: CSX Old Main Line Subdivision
Target entity description: The CSX Old Main Line Subdivision is a historic freight rail line in Maryland that traces much of the original route of the Baltimore and Ohio Railroad, one of the oldest railroads in the United States.

A. CSX RF&P Subdivision
The CSX RF&P Subdivision is a major CSX Transportation rail line in Virginia that forms part of the busy freight and passenger corridor linking Washington, D.C. with Richmond and points south.
B. CSX Capital Subdivision
CSX Capital Subdivision is a CSX Transportation rail line in Maryland that serves as a key freight and commuter corridor between Washington, D.C., and Baltimore.
C. CSX Bellwood Subdivision
The CSX Bellwood Subdivision is a freight rail line in Virginia operated by CSX Transportation, forming part of the company’s network around the Richmond area.
D. CSX Transportation Cumberland Subdivision
CSX Transportation's Cumberland Subdivision is a major freight rail line running through Maryland and West Virginia that also hosts MARC commuter rail service on the Brunswick Line.
E. CSX Trenton Subdivision
The CSX Trenton Subdivision is a freight rail line in the northeastern United States operated by CSX Transportation, forming part of a major corridor between Philadelphia and North Jersey.
F. None of above. chosen

Statements (29)

Predicate	Object
instanceOf	freight rail line ⓘ railway line ⓘ
connectsTo	other CSX subdivisions in Maryland ⓘ
country	United States ⓘ linked to: United States of America
electrification	not electrified ⓘ
followsRouteOf	Baltimore and Ohio Railroad ⓘ
hasLineDesignation	Old Main Line Subdivision ⓘ linked to: CSX Old Main Line Subdivision
hasPredecessor	Baltimore and Ohio Railroad Old Main Line ⓘ linked to: Baltimore and Ohio Railroad
heritage	historic railroad line ⓘ
historicalOperator	Baltimore and Ohio Railroad ⓘ Chessie System ⓘ
historicalSignificance	traces original route of one of the oldest railroads in the United States ⓘ
locatedIn	Maryland ⓘ Mid-Atlantic region of the United States ⓘ linked to: Mid-Atlantic states
maintainedBy	CSX Transportation ⓘ
notableFor	being among the oldest continuously used railroad alignments in the United States ⓘ
operator	CSX Transportation ⓘ
owner	CSX Transportation ⓘ
partOf	CSX network ⓘ linked to: CSX Transportation former Baltimore and Ohio Railroad system ⓘ
primaryUse	freight transportation ⓘ
railGauge	standard gauge ⓘ
railwayType	heavy rail ⓘ
regionServed	central Maryland ⓘ linked to: Central Maryland
successorTo	Baltimore and Ohio Railroad main line in Maryland ⓘ
trackConfiguration	primarily single track ⓘ
trafficType	freight only ⓘ
usedFor	interchange freight traffic ⓘ local freight service ⓘ

How these facts were elicited

Referenced by (5)

Full triples — surface form annotated when it differs from this entity's canonical label.

Point of Rocks station → railwayLineJunction → CSX Old Main Line Subdivision ⓘ

CSX Transportation Metropolitan Subdivision → connectsTo → CSX Transportation Old Main Line Subdivision ⓘ

linked to: CSX Old Main Line Subdivision

Baltimore rail network → includesLine → CSX Old Main Line Subdivision ⓘ

CSX Old Main Line Subdivision → hasLineDesignation → Old Main Line Subdivision ⓘ

linked to: CSX Old Main Line Subdivision

Sykesville, Maryland → railroadLine → Old Main Line Subdivision ⓘ

linked to: CSX Old Main Line Subdivision

All labels observed (3)

How this entity was disambiguated Show

Statements (29)

How these facts were elicited Show

Referenced by (5)

How this entity was disambiguated

How these facts were elicited