A Chessie System freight train headed by an EMD GP40-2 exits the 4,475 ft (1,364 metre) Sand Patch Tunnel - which was constructed in the mid 19th century - on the Sand Patch Grade, an approximately 100 mile (160 km) length of railway with sharp gradients and curves through the Allegheny Mountains of Pennsylvania and Maryland.
The line was originally built by the Baltimore & Ohio Railroad or B&O, which became a component of the Chessie System in 1972, which in turn merged into CSX in 1987.
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