The story
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). The route then led down Nichols Avenue SE (now Martin Luther King Avenue) to V Street SE where a car barn and stables were maintained by the company.
From Wikipedia’s article on Anacostia and Potomac River Railroad, shared under CC BY-SA 4.0.3