sentences:  It was one of the few companies not to be swept up by the two major streetcar companies at the turn of the 20th century, but it could not hold out forever and on August 31, 1912, it was purchased by the Washington Railway and Electric Company and ceased to operate as a unique entity.The Anacostia and Potomac River Railroad was chartered on May 5, 1870, given approval by Congress on February 18, 1875 and constructed across the Anacostia River later that year.The streetcars traveled from the Arsenal, along M Street SW/SE and 11th Street SE, and crossed the Navy Yard Bridge to Uniontown (now Historic Anacostia).