 The first scheduled car reached Great Falls Park in Fairfax County, Virginia, on July 3 of that year.From Georgetown, the railroad crossed the Potomac River on a superstructure built on the upstream side of the old Aqueduct Bridge to Rosslyn in Arlington, where it made connections with an older electric trolley line, the Washington, Arlington & Falls Church Railway (see Northern Virginia trolleys).From Rosslyn, the railroad traveled northwest along the north side of Lee Highway (now part of U.S. Route 29) to Cherrydale and then on its own right-of-way (now Old Dominion Drive, Virginia State Route 309) in Arlington and Fairfax Counties through forests, farmland and fruit orchards, bypassing the existing villages of Lewinsville and Langley.