#rails__rail__track  a bar or bars of rolled steel making a track along which vehicles can roll
  supertype:  bar.artifact  a rigid piece of metal or wood; usually used as a fastening or obstruction of weapon; "there were bars in the windows to prevent escape"
  subtype:  third_rail  a rail through which electric current is supplied to an electric locomotive
  part of:  railroad_track__railroad__railway  a line of track providing a runway for wheels; "he walked along the railroad track"
     part of:  rail_line__line__railway_line__railwayline  railroad track and roadbed
  part of:  tramline__tramway__streetcar_track__streetcartrack  the track on which trams or streetcars run

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