Keystone Subdivision

The Keystone Subdivision is a railroad line owned and operated by CSX Transportation in the U.S. states of Maryland and Pennsylvania. The line runs from Cumberland, Maryland west to McKeesport, Pennsylvania (near Pittsburgh) along a former Baltimore and Ohio Railroad (B&O) line. The line includes the well-known Sand Patch Grade over the Allegheny Mountains.

The east end of the Keystone Subdivision is at Viaduct Junction in Cumberland, where it meets the Cumberland Terminal Subdivision at the east end of the Cumberland Viaduct. The west end is at Sinns, on the west (left) side of the Youghiogheny River at Liberty, where it continues as the Pittsburgh Subdivision through Pittsburgh and on to West Pittsburg. The Keystone Subdivision also joins with the S&C Subdivision at Rockwood, Pennsylvania.

Amtrak's Capitol Limited uses the Keystone Subdivision.

The Baltimore and Ohio Railroad initially wanted to build to Pittsburgh, but the Pennsylvania legislature refused to grant it a charter, preferring that goods travel from Pittsburgh over the Main Line of Public Works to Philadelphia.

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