 At present, most major bus routes, including all that cross the Potomac, are operated by the Washington Metropolitan Area Transit Authority (WMATA), while several smaller systems are city- or county-owned.Since the Washington Metro opened to Virginia, most of the bus routes have terminated on either side of the Potomac River, where passengers can transfer to the rapid transit system, or to one of the few WMATA Metrobus routes that cross the river (Route 38B).Northern Virginia did not have any street railways until 1892, when the Washington, Alexandria and Mount Vernon Electric Railway (WA&MV) opened an electric trolley line between Alexandria and Mount Vernon.