The Baltimore and Ohio Railroad Crossings at the Potomac River are a set of railroad bridges that span the Potomac River

Potomac River

The Potomac River flows into the Chesapeake Bay, located along the mid-Atlantic coast of the United States. The river is approximately long, with a drainage area of about 14,700 square miles...

 between Maryland Heights, Maryland

Maryland

Maryland is a U.S. state located in the Mid Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware to its east...

 and Harpers Ferry, West Virginia

Harpers Ferry, West Virginia

Harpers Ferry is a historic town in Jefferson County, West Virginia, United States. In many books the town is called "Harper's Ferry" with an apostrophe....

 in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. Two bridges comprise the current crossing. The more recent bridge is a deck plate girder bridge

Plate girder bridge

A plate girder bridge is a bridge supported by two or more plate girders. The plate girders are typically I-beams made up from separate structural steel plates , which are welded or, in older bridges, bolted or riveted together to form the vertical web and horizontal flanges of the beam...

 dating to 1930-31 which curves across the river, carrying the Baltimore and Ohio Railroad

Baltimore and Ohio Railroad

The Baltimore and Ohio Railroad was one of the oldest railroads in the United States and the first common carrier railroad. It came into being mostly because the city of Baltimore wanted to compete with the newly constructed Erie Canal and another canal being proposed by Pennsylvania, which...

 main line to Martinsburg, West Virginia

Martinsburg, West Virginia

Martinsburg is a city in the Eastern Panhandle region of West Virginia, United States. The city's population was 14,972 at the 2000 census; according to a 2009 Census Bureau estimate, Martinsburg's population was 17,117, making it the largest city in the Eastern Panhandle and the eighth largest...

. The older bridge is a steel Pratt truss and plate girder bridge dating to 1893, carrying the B&O Valley line toward Winchester, Virginia

Winchester, Virginia

Winchester is an independent city located in the northwestern portion of the Commonwealth of Virginia in the USA. The city's population was 26,203 according to the 2010 Census...

 along the Shenandoah River

Shenandoah River

The Shenandoah River is a tributary of the Potomac River, long with two forks approximately long each, in the U.S. states of Virginia and West Virginia...

.