The Negro Mountain Tunnel is an abandoned railroad tunnel in Stonycreek Township, Somerset County, Pennsylvania. Built by the New York Central Railroad and William Henry Vanderbilt, the tunnel was one of nine built as part of the South Pennsylvania Railroad project, which was abandoned in 1885. Originally proposed to be 1,100 feet (340 m) long through Negro Mountain, only 706 feet (215 m) was built before construction was abandoned. The railroad alignment was purchased by the Pennsylvania Turnpike Commission who intended to turn the right-of-way into an automobile highway.