The Board Tree Tunnel, near Littleton, West Virginia, was built between 1851 and 1858 by the Baltimore and Ohio Railroad on its main line between Baltimore, Maryland, and Wheeling, West Virginia, under the supervision of B&O chief engineer Benjamin Henry Latrobe, II. The 2,350-foot (720 m) tunnel used a segmental cast iron lining system pioneered on the contemporaneous Kingwood Tunnel on the same line.
South portal of the Board Tree Tunnel, Marshall County, West Virginia, USA