The Patterson Creek Cutoff is an abandoned railroad line built by the Baltimore and Ohio Railroad (B&O) in northern West Virginia and Western Maryland, that served trains running on the B&O "West End" line in the Cumberland, Maryland area.
The cutoff route ran from McKenzie, Maryland to Patterson Creek, West Virginia, providing a bypass of the B&O rail yard in Cumberland for coal trains moving between Keyser, West Virginia and Brunswick, Maryland.
The tunnel passes through Knobly Mountain and is slightly less than 1 mile (1.6 km) in length.
The cutoff was later reduced to single track, and ultimately abandoned in the early 1970s by the Chessie System, successor to the B&O.
The rails have been removed from the bridge structure, and a few railroad ties are in an advanced state of decomposition.