The Marietta Subdivision is a railroad line owned by CSX Transportation and operated by Belpre Industrial Parkersburg Railroad in the U.S. states of West Virginia and Ohio.

[6] The Union Railroad, from Moore Junction south to Belpre, opened in 1860.

[citation needed] The lines became part of the B&O and CSX through leases and mergers.

In 2020, CSX leased the Marietta Sub to Cathcart Rail, who operate the line under the Belpre Industrial Parkersburg Railroad subsidiary.

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