The Fairmont Subdivision is a railroad line owned and operated by CSX Transportation in the U.S. state of West Virginia.

The line runs from Grafton northwest to Rivesville[1] along the old Baltimore and Ohio Rail Road main line and a former branch of it.

The northwest end is at a junction with the Norfolk Southern Railway's Loveridge Secondary, along which CSX has trackage rights north to the Mon Subdivision near Brownsville, Pennsylvania.

[5] The entire line became part of the B&O and CSX through leases and mergers.

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