English: George Washington Memorial Parkway: Evolution of Transportation Routes, 1776-1970 - Diagram of 1915 electric railroad routes near the later routes of the George Washington National Parkway, showing the Great Falls division of the Washington and Old Dominion Railroad (the "Great Falls Electric Railroad") and the Washington-Mount Vernon line (the "Washington, Alexandria, and Mount Vernon Electric Railway") and the East Arlington line of the Washington-Virginia Railway, and the Washington and Great Falls Electric Railway (the "Glen Echo Electric Railroad").
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