The B&O Railroad Museum is a museum exhibiting historic railroad equipment in Baltimore, Maryland, originally named the Baltimore & Ohio Transportation Museum when it opened on July 4, 1953. It has been called one of the most significant collections of railroad treasures in the world and has the largest collection of 19th-century locomotives in the U.S. The museum is located in the Baltimore and Ohio Railroad's old Mount Clare Station and adjacent roundhouse, part of the B&O's sprawling Mount Clare Shops site begun in 1829, the oldest railroad manufacturing complex in the United States.Mount Clare is considered to be a birthplace of American railroading, as the site of the first regular railroad passenger service in the U.S., beginning on May 22, 1830. It was also to this site that the first telegraph message, "What hath God wrought?" was sent on May 24, 1844, from Washington, D.C., using Samuel F. B. Morse's invention.The museum houses collections of 19th- and 20th-century artifacts related to America's railroads. The collection includes 250 pieces of railroad rolling stock, 15,000 artifacts, of archival material, four significant 19th-century buildings, including the historic roundhouse, and a mile of track, considered the most historic mile of railroad track in the United States. Train rides are offered on the mile of track on Wednesday through Sunday from April through December and weekends in January. In 2002, the museum had 160,000 visitors annually.
