sentences:  The Capitol, North O Street and South Washington Railway Company was the last streetcar company to begin operations during Washington's horsecar era.It was incorporated on March 3, 1875, and began operation later that year.Its circular route went from the Capitol along 1st Street SW; south of the Mall on Maryland and Virginia Avenues SW; north on 12th Street SW/NW, the old Ohio Avenue NW (now obliterated by Federal Triangle) and 14th Street NW to O Street NW; east on O Street NW for ten blocks; and then south on 4th Street NW, G Street NW and 1st Street NW.