Passengers can ride over Sand Patch Grade on Amtrak's Chicago-Washington train, the Capitol Limited.
The line is now part of the Keystone Subdivision, an East-West main line operated by CSX Transportation. The P&C eventually became the Pittsburgh Division of the Baltimore & Ohio Railroad (B&O), which became a component of the Chessie System in 1972, then was merged into CSX in 1987. In 2001, the 'SA' Tower near the western portal of the tunnel was decommissioned and demolished. The old tunnel was abandoned in 1917 and is now flooded and collapsed in places. The original one-track tunnel was retained for a time after the two-track tunnel was completed, temporarily providing three tracks at that point on the line. It has two concrete-lined vertical ventilation shafts to supply air. Ī new 4,475-foot-long (1,364 m) double-track tunnel on a shallower grade and improved alignment was constructed between 19. By 1900, sky-rocketing traffic on the line necessitated a tunnel with higher capacity. Ventilation in the tunnel was a problem four vertical shafts had been bored during construction, and three were finished to provide air circulation. Work on the tunnel was beset with problems – embezzlement, contractor bankruptcy, the Civil War, and political battles – so that the tunnel was only worked on for 8 of the 17 years it was technically under construction. It was designed for two tracks but, due to difficult terrain and inconsistent geology, the plan was revised to one track. At the time, this project was one of the longest tunnels in the United States. The extension required a crossing of the Allegheny Mountains via a 4,777-foot-long (1,456 m) tunnel, which was constructed between 18. Sand Patch Grade was originally built by the Pittsburgh & Connelsville Railroad (P&C) to connect Pittsburgh and Connellsville, with an extension authorized to Cumberland, Maryland in 1853. Dropping over 1,000 feet (300 m) in about 20 miles (32 km) and with grades as much as 2%, Sand Patch Grade is one of the steepest railroad grades on the East Coast. Sand Patch Grade is an approximately 100-mile-long (160 km) section of railroad track known for its steep grades and curves through the Allegheny Mountains of Pennsylvania and Maryland.
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